128-614: The Big-i ( 郡山ビッグアイ , Kōriyama Biggu Ai ) is a skyscraper located in Kōriyama , Fukushima Prefecture , Japan . Construction of the 133-metre, 24-storey skyscraper was finished in 2001. This article about a Japanese building- or structure-related topic is a stub . You can help Misplaced Pages by expanding it . Skyscraper A skyscraper is a tall continuously habitable building having multiple floors. Modern sources define skyscrapers as being at least 100 meters (330 ft) or 150 meters (490 ft) in height, though there
256-542: A Buttressed core . Trussed tube and X-bracing: Philadelphia Philadelphia , colloquially referred to as Philly , is the most populous city in the U.S. state of Pennsylvania and the sixth-most populous city in the United States , with a population of 1,603,797 in the 2020 census . The city is the urban core of the larger Delaware Valley , also known as the Philadelphia metropolitan area,
384-743: A 24-hour particle pollution rating of D in the American Lung Association 's 2017 State of the Air report, which analyzed data from 2013 to 2015. The city was ranked 22nd for ozone, 20th for short-term particle pollution, and 11th for year-round particle pollution. According to the same report, the city experienced a significant reduction in high ozone days since 2001—from nearly 50 days per year to fewer than 10—along with fewer days of high particle pollution since 2000—from about 19 days per year to about 3—and an approximate 30% reduction in annual levels of particle pollution since 2000. Five of
512-495: A bachelor's degree or higher. 23.9% spoke a language other than English at home, the most common of which was Spanish (10.8%). 15.0% of the populations foreign born, roughly half of whom are naturalized U.S. citizens. 3.7% of the population are veterans. The median household income was $ 52,889 and 22.8% of the population lived in poverty. 49.5% of the population drove alone to work, while 23.2% used public transit, 8.2% carpooled, 7.9% walked, and 7.0% worked from home. The average commute
640-403: A budget of $ 371 million. The Philadelphia Parking Authority is responsible for ensuring adequate parking for city residents, businesses, and visitors. Philadelphia's architectural history dates back to colonial times and includes a wide range of styles. The earliest structures were constructed with logs , but brick structures were common by 1700. During the 18th century, the cityscape
768-541: A city consisting entirely of high-rise housing is the 16th-century city of Shibam in Yemen . Shibam was made up of over 500 tower houses, each one rising 5 to 11 stories high, with each floor being an apartment occupied by a single family. The city was built in this way in order to protect it from Bedouin attacks. Shibam still has the tallest mudbrick buildings in the world, with many of them over 30 m (98 ft) high. An early modern example of high-rise housing
896-474: A city on the Delaware River to serve as a port and place for government. Hoping that Philadelphia would become more like an English rural town instead of a city, Penn laid out roads on a grid plan to keep houses and businesses spread far apart with areas for gardens and orchards . The city's inhabitants did not follow Penn's plans, however, and instead crowded the present-day Port of Philadelphia on
1024-497: A grid pattern between the Delaware and Schuylkill rivers that is aligned with their courses. The original city plan was designed to allow for easy travel and to keep residences separated by open space that would help prevent the spread of fire. In keeping with the idea of a "Greene Countrie Towne", and inspired by the many types of trees that grew in the region, Penn named many of the east–west streets for local trees. Penn planned
1152-716: A growth in its population in 2007, which continued with incremental annual increases through the present. A migration pattern has been established from New York City to Philadelphia by residents opting for a large city with relative proximity and a lower cost of living . Philadelphia's geographic center is about 40° 0′ 34″ north latitude and 75° 8′ 0″ west longitude. The 40th parallel north passes through neighborhoods in Northeast Philadelphia , North Philadelphia , and West Philadelphia including Fairmount Park . The city encompasses 142.71 square miles (369.62 km ), of which 134.18 square miles (347.52 km )
1280-631: A joint effort between former mayors John F. Street and Michael Nutter . The zoning changes were intended to rectify incorrect zoning maps to facilitate future community development, as the city forecasts an additional 100,000 residents and 40,000 jobs will be added by 2035. The Philadelphia Housing Authority (PHA) is the largest landlord in Pennsylvania. Established in 1937, the PHA is the nation's fourth-largest housing authority, serving about 81,000 people with affordable housing, while employing 1,400 on
1408-589: A major transatlantic gateway and transcontinental hub; the rapidly-growing PhilaPort seaport ; and Interstate 95 , the spine of the north–south highway system along the U.S. East Coast . Philadelphia is a city of many firsts, including the nation's first library (1731), hospital (1751), medical school (1765), national capital (1774), university (by some accounts) (1779), central bank (1781), stock exchange (1790), zoo (1874), and business school (1881). Philadelphia contains 67 National Historic Landmarks , including Independence Hall . From
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#17327981008851536-610: A moderately sunny climate with an average of 2,498 hours of sunshine annually. The percentage of sunshine ranges from 47% in December to 61% in June, July, and August. The January daily average temperature is 33.7 °F (0.9 °C). The temperature frequently rises to 50 °F (10 °C) during thaws. July averages 78.7 °F (25.9 °C). Heat waves accompanied by high humidity and heat indices are frequent, with highs reaching or exceeding 90 °F (32 °C) on 30 days of
1664-751: A more classical approach came back to global skyscraper design, that remains popular today. Examples are the Wells Fargo Center , NBC Tower , Parkview Square , 30 Park Place , the Messeturm , the iconic Petronas Towers and Jin Mao Tower . Other contemporary styles and movements in skyscraper design include organic , sustainable , neo-futurist , structuralist , high-tech , deconstructivist , blob , digital , streamline , novelty , critical regionalist , vernacular , Neo Art Deco and neohistorist , also known as revivalist . 3 September
1792-399: A particularly small surface area of what are conventionally thought of as walls. Because the walls are not load-bearing most skyscrapers are characterized by surface areas of windows made possible by the concept of steel frame and curtain wall. However, skyscrapers can also have curtain walls that mimic conventional walls and have a small surface area of windows. The concept of a skyscraper is
1920-420: A product of the industrialized age , made possible by cheap fossil fuel derived energy and industrially refined raw materials such as steel and concrete . The construction of skyscrapers was enabled by steel frame construction that surpassed brick and mortar construction starting at the end of the 19th century and finally surpassing it in the 20th century together with reinforced concrete construction as
2048-454: A proto-skyscraper, or to New York's seven-floor Equitable Life Building , built in 1870. Steel skeleton construction has allowed for today's supertall skyscrapers now being built worldwide. The nomination of one structure versus another being the first skyscraper, and why, depends on what factors are stressed. The structural definition of the word skyscraper was refined later by architectural historians, based on engineering developments of
2176-412: A proud and soaring thing, rising in sheer exaltation that from bottom to top it is a unit without a single dissenting line. Some structural engineers define a high-rise as any vertical construction for which wind is a more significant load factor than earthquake or weight. Note that this criterion fits not only high-rises but some other tall structures, such as towers . Different organizations from
2304-571: A skyscraper today, it was record setting. The building of tall buildings in the 1880s gave the skyscraper its first architectural movement, broadly termed the Chicago School , which developed what has been called the Commercial Style. The architect, Major William Le Baron Jenney , created a load-bearing structural frame. In this building, a steel frame supported the entire weight of the walls, instead of load-bearing walls carrying
2432-417: A small surface area of windows. Modern skyscrapers often have a tubular structure , and are designed to act like a hollow cylinder to resist wind, seismic, and other lateral loads. To appear more slender, allow less wind exposure and transmit more daylight to the ground, many skyscrapers have a design with setbacks , which in some cases is also structurally required. As of September 2023 , fifteen cities in
2560-815: A time, row houses built elsewhere in the United States were known as "Philadelphia rows". A variety of row houses are found throughout the city, from Federal-style continuous blocks in Old City and Society Hill to Victorian-style homes in North Philadelphia to twin row houses in West Philadelphia . While newer homes have been built recently, much of the housing dates to the 18th, 19th, and early 20th centuries, which has created problems such as urban decay and vacant lots. Some neighborhoods, including Northern Liberties and Society Hill, have been rehabilitated through gentrification . As of 2014 ,
2688-521: A time, the tallest of which is the 97.2 m (319 ft) high Asinelli Tower. A Florentine law of 1251 decreed that all urban buildings be immediately reduced to less than 26 m. Even medium-sized towns of the era are known to have proliferations of towers, such as the 72 towers that ranged up to 51 m height in San Gimignano . The medieval Egyptian city of Fustat housed many high-rise residential buildings, which Al-Muqaddasi in
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#17327981008852816-657: A town in Finland with a Swedish majority. In 1655, a Dutch military campaign led by New Netherland Director-General Peter Stuyvesant took control of the Swedish colony, ending its claim to independence. The Swedish and Finnish people settlers continued to have their own militia , religion, and court, and to enjoy substantial autonomy under the Dutch. An English fleet captured the New Netherland colony in 1664, though
2944-466: A variety of shapes, and it could be riveted, ensuring strong connections. The simplicity of a steel frame eliminated the inefficient part of a shear wall, the central portion, and consolidated support members in a much stronger fashion by allowing both horizontal and vertical supports throughout. Among steel's drawbacks is that as more material must be supported as height increases, the distance between supporting members must decrease, which in turn increases
3072-469: A vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation". Closely spaced interconnected exterior columns form the tube. Horizontal loads (primarily wind) are supported by the structure as a whole. Framed tubes allow fewer interior columns, and so create more usable floor space, and about half the exterior surface is available for windows. Where larger openings like garage doors are required,
3200-466: Is highly variable. Some winters have only light snow while others include major snowstorms. The normal seasonal snowfall averages 22.4 in (57 cm), with rare snowfalls in November or April, and rarely any sustained snow cover. Seasonal snowfall accumulation has ranged from trace amounts in 1972–73, to 78.7 inches (200 cm) in the winter of 2009–10. The city's heaviest single-storm snowfall
3328-406: Is important in most building design, but particularly for skyscrapers since even a small chance of catastrophic failure is unacceptable given the tremendous damage such failure would cause. This presents a paradox to civil engineers : the only way to assure a lack of failure is to test for all modes of failure, in both the laboratory and the real world. But the only way to know of all modes of failure
3456-665: Is land and 8.53 square miles (22.09 km ), or 6%, is water. Natural bodies of water include the Delaware and Schuylkill rivers, lakes in Franklin Delano Roosevelt Park , and Cobbs , Wissahickon , and Pennypack creeks. The largest artificial body of water is East Park Reservoir in Fairmount Park . The lowest point is sea level and the highest point is in Chestnut Hill , about 446 feet (136 m) above sea level on Summit Street near
3584-433: Is largely from the force of the building material itself. In most building designs, the weight of the structure is much larger than the weight of the material that it will support beyond its own weight. In technical terms, the dead load , the load of the structure, is larger than the live load , the weight of things in the structure (people, furniture, vehicles, etc.). As such, the amount of structural material required within
3712-414: Is no universally accepted definition, other than being very tall high-rise buildings . Skyscrapers may host offices, hotels, residential spaces, and retail spaces. One common feature of skyscrapers is having a steel frame that supports curtain walls . This idea was invented by Viollet le Duc in his discourses on architecture. These curtain walls either bear on the framework below or are suspended from
3840-598: Is one of the largest contiguous urban park areas in the U.S. The two parks, along with the Colonial Revival , Georgian and Federal -style mansions in them, have been listed as one entity on the National Register of Historic Places since 1972. Within the Köppen climate classification , Philadelphia falls under the northern periphery of the humid subtropical climate zone (Köppen Cfa ). Within
3968-399: Is the global commemorative day for skyscrapers, called "Skyscraper Day". New York City developers competed among themselves, with successively taller buildings claiming the title of "world's tallest" in the 1920s and early 1930s, culminating with the completion of the 318.9 m (1,046 ft) Chrysler Building in 1930 and the 443.2 m (1,454 ft) Empire State Building in 1931,
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4096-419: Is to learn from previous failures. Thus, no engineer can be absolutely sure that a given structure will resist all loadings that could cause failure; instead, one can only have large enough margins of safety such that a failure is acceptably unlikely. When buildings do fail, engineers question whether the failure was due to some lack of foresight or due to some unknowable factor. The load a skyscraper experiences
4224-456: The 2020 U.S. Census , there were 1,603,797 people residing in Philadelphia, representing a 1.2% increase from the 2019 census estimate. The racial composition of the city was 39.3% Black alone (42.0% Black alone or in combination), 36.3% White alone (41.9% White alone or in combination), 8.7% Asian alone, 0.4% American Indian and Alaska Native alone, 8.7% some other race, and 6.9% multiracial. 14.9% of residents were Hispanic or Latino. 34.8% had
4352-848: The Battle of Brandywine in Chadds Ford Township , on September 11, 1777, during the Philadelphia campaign , the revolutionary capital of Philadelphia was defenseless and the city prepared for what was perceived to be an inevitable British attack. Because bells could easily be recast into munitions, the Liberty Bell , then known as the Pennsylvania State Bell, and bells from two Philadelphia churches, Christ Church and St. Peter's Church , were hastily taken down and transported by heavily guarded wagon train out of
4480-624: The British Army , which was then the world's most powerful military force. Since the Declaration's July 4, 1776, adoption, its signing has been cited globally and repeatedly by various peoples of the world seeking independence and liberty. It also has been, since its adoption, the basis for annual celebration by Americans; in 1938, this celebration of the Declaration was formalized as Independence Day , one of only eleven designated U.S. federal holidays . After George Washington 's defeat at
4608-838: The British colonial era . The city went on to play a historic and vital role during the American Revolution and Revolutionary War , serving as the central meeting place for the nation's founding fathers , hosting the First Continental Congress in 1774, preserving the Liberty Bell , and hosting the Second Continental Congress during which the nation's 56 founders formed the Continental Army and elected George Washington as its commander in 1775, and unanimously adopted
4736-631: The Declaration of Independence on July 4, 1776. For nine months, from September 1777 to June 1778, the city fell under British occupation during the war's Philadelphia campaign . In 1787, the U.S. Constitution was ratified in Philadelphia at the Philadelphia Convention . Philadelphia remained the nation's largest city until 1790, and it served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions until 1800, when construction of
4864-614: The Delaware River watershed , western Long Island , and the Lower Hudson Valley . Most Lenape were pushed out of the region during the 18th century by expanding European colonies, exacerbated by losses from intertribal conflicts. Lenape communities were weakened by newly introduced diseases, mainly smallpox , and conflict with Europeans. The Iroquois occasionally fought the Lenape. Surviving Lenape moved west into
4992-684: The Eastern Mediterranean during the Greek and Roman periods, including modern Alaşehir , mentioned as the site of an early Christian congregation in the Book of Revelation . As a Quaker , Penn had experienced religious persecution and wanted his colony to be a place where anyone could worship freely. This tolerance, which exceeded that of other colonies, led to better relations with the local native tribes and fostered Philadelphia's rapid growth into America's most important city. Penn planned
5120-583: The Great Migration from the South . By the 20th century, Philadelphia had an entrenched Republican political machine and a complacent population. In 1910, a general strike shut down the entire city. In 1917, following outrage over the election-year murder of a Philadelphia police officer, led to the shrinking of the City Council from two houses to just one. In July 1919, Philadelphia
5248-559: The Second Continental Congress , which adopted the Declaration of Independence in what was then called the Pennsylvania State House and was later renamed Independence Hall. Historian Joseph Ellis , in 2007, described the Declaration of Independence, written predominantly by Thomas Jefferson , as "the most potent and consequential words in American history," and its adoption represented a declaration of war against
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5376-480: The Trewartha climate classification , Philadelphia has a temperate maritime climate ( Do ) limited to the north by the continental climate ( Dc ). Summers are typically hot and muggy. Fall and spring are generally mild, and winter is moderately cold. The plant life hardiness zones are 7a and 7b, reflecting an average annual extreme minimum temperature between 0 and 10 °F (−18 and −12 °C). Snowfall
5504-486: The federal regulatory environment of Washington, D.C. Greater Philadelphia is also a biotechnology hub. The Philadelphia Stock Exchange , owned by Nasdaq since 2008, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station , the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transportation and logistics infrastructure also includes Philadelphia International Airport ,
5632-643: The " Seven Sisters ", were built between 1947 and 1953; and one, the Main building of Moscow State University , was the tallest building in Europe for nearly four decades (1953–1990). Other skyscrapers in the style of Socialist Classicism were erected in East Germany ( Frankfurter Tor ), Poland ( PKiN ), Ukraine ( Hotel Moscow ), Latvia ( Academy of Sciences ), and other Eastern Bloc countries. Western European countries also began to permit taller skyscrapers during
5760-460: The 10th century described as resembling minarets . Nasir Khusraw in the early 11th century described some of them rising up to 14 stories, with roof gardens on the top floor complete with ox-drawn water wheels for irrigating them. Cairo in the 16th century had high-rise apartment buildings where the two lower floors were for commercial and storage purposes and the multiple stories above them were rented out to tenants . An early example of
5888-465: The 1880s that had enabled construction of tall multi-story buildings. This definition was based on the steel skeleton—as opposed to constructions of load-bearing masonry , which passed their practical limit in 1891 with Chicago's Monadnock Building . What is the chief characteristic of the tall office building? It is lofty. It must be tall. The force and power of altitude must be in it, the glory and pride of exaltation must be in it. It must be every inch
6016-600: The 1960s now use a tube design derived from Khan's structural engineering principles, examples including the construction of the World Trade Center , Aon Center , Petronas Towers , Jin Mao Building , and most other supertall skyscrapers since the 1960s. The strong influence of tube structure design is also evident in the construction of the current tallest skyscraper, the Burj Khalifa , which uses
6144-603: The 1960s, according to the CTBUH, the skyscraper has been reoriented away from a symbol for North American corporate power to instead communicate a city or nation's place in the world. Skyscraper construction entered a three-decades-long era of stagnation in 1930 due to the Great Depression and then World War II . Shortly after the war ended, Russia began construction on a series of skyscrapers in Moscow . Seven, dubbed
6272-490: The 1980s. Historic areas such as Old City and Society Hill were renovated during the reformist mayoral era of the 1950s through the 1980s, making both areas among the most desirable Center City neighborhoods. Immigrants from around the world began to enter the U.S. through Philadelphia as their gateway, leading to a reversal of the city's population decline between 1950 and 2000, during which it lost about 25 percent of its residents. Philadelphia eventually began experiencing
6400-665: The 2 square miles (5.2 km ) of Center City to the roughly 134 square miles (350 km ) of Philadelphia County . In the latter half of the 19th century and leading into the 20th century, immigrants from Russia, Eastern Europe, and Italy, and African Americans from the southern U.S. settled in the city. Philadelphia was represented by the Washington Grays in the American Civil War . The African-American population of Philadelphia increased from 31,699 to 219,559 between 1880 and 1930, largely stemming from
6528-807: The 26th century BC. It was not surpassed in height for thousands of years, the 160 m (520 ft) Lincoln Cathedral having exceeded it in 1311–1549, before its central spire collapsed. The latter in turn was not surpassed until the 555-foot (169 m) Washington Monument in 1884. However, being uninhabited, none of these structures actually comply with the modern definition of a skyscraper. High-rise apartments flourished in classical antiquity . Ancient Roman insulae in imperial cities reached 10 and more stories. Beginning with Augustus (r. 30 BC-14 AD), several emperors attempted to establish limits of 20–25 m for multi-stories buildings, but were met with only limited success. Lower floors were typically occupied by shops or wealthy families, with
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#17327981008856656-690: The 57 m (187 ft) tall 1924 Marx House in Düsseldorf , the 65 m (213 ft) tall Borsigturm in Berlin , built in 1924, the 65 m (213 ft) tall Hansahochhaus in Cologne , Germany, built in 1925; the 61 m (200 ft) Kungstornen (Kings' Towers) in Stockholm , Sweden, which were built 1924–25; the 77 m (253 ft) Ullsteinhaus in Berlin, Germany, built in 1927;
6784-613: The 89 m (292 ft) Edificio Telefónica in Madrid , Spain, built in 1929; the 87.5 m (287 ft) Boerentoren in Antwerp, Belgium, built in 1932; the 66 m (217 ft) Prudential Building in Warsaw , Poland, built in 1934; and the 108 m (354 ft) Torre Piacentini in Genoa , Italy, built in 1940. After an early competition between New York City and Chicago for
6912-566: The CTBUH, is the distance between the highest floor and its architectural top (excluding antennae, flagpole or other functional extensions). Vanity height first appeared in New York City skyscrapers as early as the 1920s and 1930s but supertall buildings have relied on such uninhabitable extensions for on average 30% of their height, raising potential definitional and sustainability issues. The current era of skyscrapers focuses on sustainability , its built and natural environments, including
7040-511: The Delaware River and subdivided and resold their lots. Before Penn left Philadelphia for the final time, he issued the Charter of 1701 establishing it as a city. Though poor at first, Philadelphia became an important trading center with tolerable living conditions by the 1750s. Benjamin Franklin , a leading citizen, helped improve city services and founded new ones that were among the first in
7168-794: The Second Continental Congress adopted the Articles of Confederation on November 15, 1777, and the city later served as the meeting place for the Constitutional Convention , which ratified the Constitution in Independence Hall in Philadelphia on September 17, 1787. Philadelphia served as capital of the United States for much of the colonial and early post-colonial periods, including for a decade, from 1790 to 1800, while Washington, D.C. ,
7296-522: The United States after Midtown Manhattan in New York City. Philadelphia's neighborhoods are divided into six large sections that surround Center City: North Philadelphia , Northeast Philadelphia , South Philadelphia , Southwest Philadelphia , West Philadelphia , and Northwest Philadelphia . The city's geographic boundaries have been largely unchanged since these neighborhoods were consolidated in 1854. However, each of these large areas contains numerous neighborhoods, some of whose boundaries derive from
7424-407: The United States and Europe define skyscrapers as buildings at least 150 m (490 ft) in height or taller, with " supertall " skyscrapers for buildings higher than 300 m (984 ft) and " megatall " skyscrapers for those taller than 600 m (1,969 ft). The tallest structure in ancient times was the 146 m (479 ft) Great Pyramid of Giza in ancient Egypt , built in
7552-497: The amount of material that must be supported. This becomes inefficient and uneconomic for buildings above 40 stories tall as usable floor spaces are reduced for supporting column and due to more usage of steel. A new structural system of framed tubes was developed by Fazlur Rahman Khan in 1963. The framed tube structure is defined as "a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or near their edges to form
7680-472: The boroughs, townships, and other communities that constituted Pennsylvania County before their inclusion within the city. The City Planning Commission , tasked with guiding growth and development of the city, has divided the city into 18 planning districts as part of the Philadelphia2035 physical development plan. Much of the city's 1980 zoning code was overhauled from 2007 to 2012 as part of
7808-402: The city and its surrounding Pennsylvania counties. With five professional sports teams and one of the nation's most loyal and passionate fan bases, Philadelphia is often ranked as the nation's best city for professional sports fans. The city has a culturally and philanthropically active LGBTQ+ community . Philadelphia also has played an immensely influential historic and ongoing role in
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#17327981008857936-587: The city for its outlying railroad commuting towns and newer housing. The resulting reduction in Philadelphia's tax base and the resources of local government caused the city to struggle through a long period of adjustment, and it approached bankruptcy by the late 1980s. In 1985, the MOVE Bombing of the Cobbs Creek neighborhood by city helicopters occurred, killing 11 and destroying 61 homes. Revitalization and gentrification of neighborhoods began in
8064-532: The city's 17th century founding through the present, Philadelphia has been the birthplace or home to an extensive number of prominent and influential Americans . Prior to the arrival of Europeans in the early 17th century, the Philadelphia area was home to the Lenape Indians in the village of Shackamaxon . They were also called the Delaware Indians, and their historical territory was along
8192-456: The city's director of public safety, but political pressure still prevented long-term success in fighting crime and corruption. In 1940, non-Hispanic whites constituted 86.8% of the city's population. In 1950, the population peaked at more than two million residents, then began to decline with the restructuring of industry that led to the loss of many middle-class union jobs. In addition, suburbanization enticed many affluent residents to depart
8320-399: The city's tallest building. The Comcast Technology Center was completed in 2018, reaching a height of 1,121 ft (342 m), as the tallest building in the United States outside of Manhattan and Chicago. For much of Philadelphia's history, the typical home has been the row house . The row house was introduced to the United States via Philadelphia in the early 19th century and, for
8448-519: The city's total park space, including municipal, state, and federal parks in the city, amounts to 11,211 acres (17.5 sq mi). Philadelphia's largest park is Fairmount Park , which includes the Philadelphia Zoo and encompasses 2,052 acres (3.2 sq mi) of the total parkland. Fairmount Park's adjacent Wissahickon Valley Park contains 2,042 acres (3.2 sq mi). Fairmount Park, when combined with Wissahickon Valley Park,
8576-694: The city. The Liberty Bell was taken to Zion German Reformed Church in Northampton Town, which is present-day Allentown , where it was hidden under the church's floor boards for nine months from September 1777 until the British Army's departure from Philadelphia in June 1778. Two Revolutionary War battles, the Siege of Fort Mifflin , fought between September 26 and November 16, 1777, and the Battle of Germantown , fought on October 4, 1777, took place within Philadelphia's city limits. In Philadelphia,
8704-424: The classical designs of the early skyscrapers , instead embracing the uniform international style ; many older skyscrapers were redesigned to suit contemporary tastes or even demolished—such as New York's Singer Building , once the world's tallest skyscraper. German -American architect Ludwig Mies van der Rohe became one of the world's most renowned architects in the second half of the 20th century. He conceived
8832-529: The colonies made it a natural center for America's revolutionaries . By the 1750s, Philadelphia surpassed Boston as the largest city and busiest port in British America , and the second-largest city in the entire British Empire after London . In 1774, as resentment of British colonial practices and support for independence was burgeoning in the colonies, Philadelphia hosted the First Continental Congress . From 1775 to 1781, Philadelphia hosted
8960-473: The colony. Penn made a treaty of friendship with Lenape chief Tammany under an elm tree at Shackamaxon , in what is now the city's Fishtown neighborhood. Penn named the city Philadelphia, which is Greek for "brotherly love", derived from the Ancient Greek terms φίλος phílos (beloved, dear) and ἀδελφός adelphós (brother, brotherly). There were a number of cities named Philadelphia in
9088-402: The country, and the first Black Episcopal Church . The free Black community also established many schools for its children with the help of Quakers . Large-scale construction projects for new roads, canals , and railroads made Philadelphia the first major industrial city in the United States. Throughout the 19th century, Philadelphia hosted a variety of industries and businesses; the largest
9216-648: The creation of a significant number of early skyscrapers, though none of these were steel reinforced and few remain today. Height limits and fire restrictions were later introduced. In the late 1800s, London builders found building heights limited due to issues with existing buildings. High-rise development in London is restricted at certain sites if it would obstruct protected views of St Paul's Cathedral and other historic buildings. This policy, 'St Paul's Heights', has officially been in operation since 1927. Concerns about aesthetics and fire safety had likewise hampered
9344-490: The creation of five public parks in the city which were renamed in 1824. Centre Square was renamed Penn Square ; Northeast Square was renamed Franklin Square ; Southeast Square was renamed Washington Square ; Southwest Square was renamed Rittenhouse Square ; and Northwest Square was renamed Logan Circle/Square . Center City had an estimated 183,240 residents as of 2015 , making it the second-most populated downtown area in
9472-520: The development and evolution of American music, especially R&B , soul , and rock . As of 2022 , the Philadelphia metropolitan area had a gross metropolitan product of US$ 518.5 billion and is home to five Fortune 500 corporate headquarters. Metropolitan Philadelphia ranks as one of the Big Five U.S. venture capital hubs, facilitated by its geographic proximity to both the entrepreneurial and financial ecosystems of New York City and to
9600-651: The development of skyscrapers across continental Europe for the first half of the 20th century. By 1940, there were around 100 high-rise buildings in Europe ( List of early skyscrapers ). Some examples of these are the 43 m (141 ft) tall 1898 Witte Huis (White House) in Rotterdam ; the 51.5 m (169 ft) tall PAST Building (1906–1908) in Warsaw ; the Royal Liver Building in Liverpool, completed in 1911 and 90 m (300 ft) high;
9728-402: The early 1960s Bangladeshi-American structural engineer Fazlur Rahman Khan , considered the "father of tubular designs " for high-rises, discovered that the dominating rigid steel frame structure was not the only system apt for tall buildings, marking a new era of skyscraper construction in terms of multiple structural systems . His central innovation in skyscraper design and construction
9856-416: The environment and loaded structures with decorative elements and extravagant finishes. This approach to design was opposed by Fazlur Khan and he considered the designs to be whimsical rather than rational. Moreover, he considered the work to be a waste of precious natural resources. Khan's work promoted structures integrated with architecture and the least use of material resulting in the smallest impact on
9984-454: The environment. The next era of skyscrapers will focus on the environment including performance of structures, types of material, construction practices, absolute minimal use of materials/natural resources, embodied energy within the structures, and more importantly, a holistically integrated building systems approach. Modern building practices regarding supertall structures have led to the study of "vanity height". Vanity height, according to
10112-528: The first building in the world to feature a metal-framed glass curtain wall , a design element which creates light, airy interiors and has since been used the world over as a defining feature of skyscrapers". Further developments led to what many individuals and organizations consider the world's first skyscraper, the ten-story Home Insurance Building in Chicago, built in 1884–1885. While its original height of 42.1 m (138 ft) does not even qualify as
10240-620: The first modern International Style skyscraper in the United States, the PSFS Building , designed by George Howe and William Lescaze . The 548 ft (167 m) City Hall remained the tallest building in the city until 1987 when One Liberty Place was completed. Numerous glass and granite skyscrapers were built in Center City beginning in the late 1980s. In 2007, the Comcast Center surpassed One Liberty Place to become
10368-543: The first official World's fair in the U.S. Immigrants, mostly from Ireland and Germany, settled in Philadelphia and the surrounding districts. These immigrants were largely responsible for the first general strike in North America in 1835, in which workers in the city won the ten-hour workday. The city was a destination for thousands of Irish immigrants fleeing the Great Famine in the 1840s; housing for them
10496-491: The framework above, rather than resting on load-bearing walls of conventional construction. Some early skyscrapers have a steel frame that enables the construction of load-bearing walls taller than of those made of reinforced concrete . Modern skyscraper walls are not load-bearing , and most skyscrapers are characterized by large surface areas of windows made possible by steel frames and curtain walls. However, skyscrapers can have curtain walls that mimic conventional walls with
10624-479: The glass façade skyscraper and, along with Norwegian Fred Severud , designed the Seagram Building in 1958, a skyscraper that is often regarded as the pinnacle of modernist high-rise architecture. Skyscraper construction surged throughout the 1960s. The impetus behind the upswing was a series of transformative innovations which made it possible for people to live and work in "cities in the sky". In
10752-473: The hundred-story John Hancock Center and the massive 442 m (1,450 ft) Willis Tower . Other pioneers of this field include Hal Iyengar , William LeMessurier , and Minoru Yamasaki , the architect of the World Trade Center . Many buildings designed in the 70s lacked a particular style and recalled ornamentation from earlier buildings designed before the 50s. These design plans ignored
10880-627: The intersection of Germantown Avenue and Bethlehem Pike at: 40.07815 N, 75.20747 W. Philadelphia is located on the Atlantic Seaboard Fall Line that separates the Atlantic Plain from the Piedmont . The Schuylkill River's rapids at East Falls were inundated by completion of the dam at Fairmount Water Works . The city is the seat of its own county . The city is bordered by six adjacent counties: Montgomery to
11008-551: The last occurrence of such a temperature being July 21, 2019. The lowest officially recorded temperature was −11 °F (−24 °C) on February 9, 1934. Temperatures at or below 0 °F (−18 °C) are rare, with the last such occurrence being January 19, 1994 . The record low maximum is 5 °F (−15 °C) on February 10, 1899, and December 30, 1880. The record high minimum is 83 °F (28 °C) on July 23, 2011, and July 24, 2010. See or edit raw graph data . Philadelphia County received an ozone grade of F and
11136-546: The late 1970s and continues into the 21st century with much of the development occurring in the Center City and University City neighborhoods. But this expanded a shortage of affordable housing in the city. After many manufacturers and businesses left Philadelphia or shut down, the city started attracting service businesses and began to market itself more aggressively as a tourist destination. Contemporary glass-and-granite skyscrapers were built in Center City beginning in
11264-454: The lower levels of a skyscraper will be much larger than the material required within higher levels. This is not always visually apparent. The Empire State Building 's setbacks are actually a result of the building code at the time ( 1916 Zoning Resolution ), and were not structurally required. On the other hand, John Hancock Center 's shape is uniquely the result of how it supports loads. Vertical supports can come in several types, among which
11392-674: The most common for skyscrapers can be categorized as steel frames, concrete cores, tube within tube design, and shear walls. The wind loading on a skyscraper is also considerable. In fact, the lateral wind load imposed on supertall structures is generally the governing factor in the structural design. Wind pressure increases with height, so for very tall buildings, the loads associated with wind are larger than dead or live loads. Other vertical and horizontal loading factors come from varied, unpredictable sources, such as earthquakes. By 1895, steel had replaced cast iron as skyscrapers' structural material. Its malleability allowed it to be formed into
11520-435: The most complex encountered given the balances required between economics , engineering , and construction management. One common feature of skyscrapers is a steel framework from which curtain walls are suspended, rather than load-bearing walls of conventional construction. Most skyscrapers have a steel frame that enables them to be built taller than typical load-bearing walls of reinforced concrete. Skyscrapers usually have
11648-545: The nation's eighth-largest metropolitan area and seventh-largest combined statistical area with 6.245 million residents and 7.366 million residents, respectively. Philadelphia has played an extensive role in United States history . The city was founded in 1682 by William Penn , an English Quaker and advocate of religious freedom , and served as the capital of the Pennsylvania Colony during
11776-971: The nation, including a fire company , library , and hospital . A number of philosophical societies were formed, which were centers of the city's intellectual life, including the Philadelphia Society for Promoting Agriculture (1785), the Pennsylvania Society for the Encouragement of Manufactures and the Useful Arts (1787), the Academy of Natural Sciences (1812), and the Franklin Institute (1824). These societies developed and financed new industries that attracted skilled and knowledgeable immigrants from Europe. Philadelphia's importance and central location in
11904-469: The nation. Fairmount Park , when combined with adjacent Wissahickon Valley Park in the same watershed , is 2,052 acres (830 ha), representing one of the nation's largest and the world's 54th-largest urban park . Philadelphia is known for its arts, culture , cuisine , and colonial and Revolutionary-era history; in 2016, it attracted 42 million domestic tourists who spent $ 6.8 billion, representing $ 11 billion in economic impact to
12032-509: The new national capital in Washington, D.C. was completed. Philadelphia maintains extensive contemporary influence in business and industry , culture , sports , and music . With 17 four-year universities and colleges in the city, Philadelphia is one of the nation's leading centers for higher education and academic research . The city is a national cultural center, hosting more outdoor sculptures and murals than any other city in
12160-449: The northwest; Bucks to the north and northeast; Burlington County, New Jersey to the east; Camden County, New Jersey to the southeast; Gloucester County, New Jersey to the south; and Delaware County to the southwest. Philadelphia was created in the 17th century, following the plan by William Penn 's surveyor Thomas Holme . Center City is structured with long, straight streets running nearly due east–west and north–south, forming
12288-406: The performance of structures, types of materials, construction practices, absolute minimal use of materials and natural resources, energy within the structure, and a holistically integrated building systems approach. LEED is a current green building standard. Architecturally, with the movements of Postmodernism , New Urbanism and New Classical Architecture , that established since the 1980s,
12416-728: The price of steel decreased and labor costs increased. The steel frames become inefficient and uneconomic for supertall buildings as usable floor space is reduced for progressively larger supporting columns. Since about 1960, tubular designs have been used for high rises. This reduces the usage of material (more efficient in economic terms – Willis Tower uses a third less steel than the Empire State Building) yet allows greater height. It allows fewer interior columns, and so creates more usable floor space. It further enables buildings to take on various shapes. Elevators are characteristic to skyscrapers. In 1852 Elisha Otis introduced
12544-484: The safety elevator at the E. V. Haughwout Building in New York City, allowing convenient and safe transport to buildings' upper floors. Otis later introduced the first commercial passenger elevators to the Equitable Life Building in 1870, considered by some architectural historians to be the first skyscraper. Another crucial development was the use of a steel frame instead of stone or brick, otherwise
12672-643: The safety elevator, allowing convenient and safe passenger movement to upper floors. Another crucial development was the use of a steel frame instead of stone or brick, otherwise the walls on the lower floors on a tall building would be too thick to be practical. Today major manufacturers of elevators include Otis , ThyssenKrupp , Schindler , and KONE . Advances in construction techniques have allowed skyscrapers to narrow in width, while increasing in height. Some of these new techniques include mass dampers to reduce vibrations and swaying, and gaps to allow air to pass through, reducing wind shear. Good structural design
12800-768: The second half of the 19th century. His contemporaries included John McArthur Jr. , Addison Hutton , Wilson Eyre , the Wilson Brothers , and Horace Trumbauer . In 1871, construction began on the Second Empire -style Philadelphia City Hall . The Philadelphia Historical Commission was created in 1955 to preserve the cultural and architectural history of the city. The commission maintains the Philadelphia Register of Historic Places , adding historic buildings, structures, sites, objects and districts as it sees fit. In 1932, Philadelphia became home to
12928-612: The situation did not change substantially until 1682, when the area was included in William Penn 's charter for Pennsylvania. In 1681, in partial repayment of a debt, Charles II of England granted Penn a charter for what would become the Pennsylvania colony . Despite the royal charter, Penn bought the land from the local Lenape in an effort to establish good terms with the Native Americans and ensure peace for
13056-493: The surrounding Delaware Valley in the early 17th century. The first settlements were founded by Dutch colonists , who built Fort Nassau on the Delaware River in 1623 in what is now Brooklawn, New Jersey . The Dutch considered the entire Delaware River valley to be part of their New Netherland colony. In 1638, Swedish settlers led by renegade Dutch established the colony of New Sweden at Fort Christina , located in present-day Wilmington, Delaware , and quickly spread out in
13184-522: The ten largest combined statistical areas (CSAs) were ranked higher for ozone: Los Angeles (1st), New York City (9th), Houston (12th), Dallas (13th), and San Jose, California (18th). Many smaller CSAs were also ranked higher for ozone, including Sacramento (8th), Las Vegas (10th), Denver (11th), El Paso (16th), and Salt Lake City (20th). Only two of those same ten CSAs, San Jose and Los Angeles, were ranked higher than Philadelphia for both year-round and short-term particle pollution. As of
13312-438: The title for six years. The design and construction of skyscrapers involves creating safe, habitable spaces in very tall buildings. The buildings must support their weight, resist wind and earthquakes, and protect occupants from fire. Yet they must also be conveniently accessible, even on the upper floors, and provide utilities and a comfortable climate for the occupants. The problems posed in skyscraper design are considered among
13440-715: The tube frame must be interrupted, with transfer girders used to maintain structural integrity. Tube structures cut down costs, at the same time allowing buildings to reach greater heights. Concrete tube-frame construction was first used in the DeWitt-Chestnut Apartment Building , completed in Chicago in 1963, and soon after in the John Hancock Center and World Trade Center . The tubular systems are fundamental to tall building design. Most buildings over 40 stories constructed since
13568-482: The tube structure was the Chestnut De-Witt apartment building, considered to be a major development in modern architecture. These new designs opened an economic door for contractors, engineers, architects, and investors, providing vast amounts of real estate space on minimal plots of land. Over the next fifteen years, many towers were built by Fazlur Rahman Khan and the " Second Chicago School ", including
13696-629: The upper Ohio River basin. Following the American Revolutionary War and subsequent formation of an independent United States, the Lenape began moving further west. In the 1860s, the United States government sent most remaining Lenape in the eastern United States to the Indian Territory in present-day Oklahoma and surrounding territories as part of the Indian removal policy. Europeans first entered Philadelphia and
13824-478: The upper rented to the lower classes. Surviving Oxyrhynchus Papyri indicate that seven-stories buildings existed in provincial towns such as in 3rd century AD Hermopolis in Roman Egypt . The skylines of many important medieval cities had large numbers of high-rise urban towers, built by the wealthy for defense and status. The residential Towers of 12th century Bologna numbered between 80 and 100 at
13952-587: The valley. In 1644, New Sweden supported the Susquehannocks in their war against Maryland colonists. In 1648, the Dutch built Fort Beversreede on the west bank of the Delaware, south of the Schuylkill River near the present-day Eastwick section of Philadelphia, to reassert their dominion over the area. The Swedes responded by building Fort Nya Korsholm , or New Korsholm , named after
14080-465: The walls on the lower floors on a tall building would be too thick to be practical. An early development in this area was Oriel Chambers in Liverpool , England, built in 1864. It was only five floors high. The Royal Academy of Arts states, "critics at the time were horrified by its 'large agglomerations of protruding plate glass bubbles'. In fact, it was a precursor to Modernist architecture, being
14208-617: The weight of the building. This development led to the "Chicago skeleton" form of construction. In addition to the steel frame, the Home Insurance Building also utilized fireproofing, elevators, and electrical wiring, key elements in most skyscrapers today. Burnham and Root 's 45 m (148 ft) Rand McNally Building in Chicago, 1889, was the first all-steel framed skyscraper, while Louis Sullivan 's 41 m (135 ft) Wainwright Building in St. Louis, Missouri, 1891,
14336-814: The world have more than 100 skyscrapers that are 150 m (492 ft) or taller: Hong Kong with 552 skyscrapers; Shenzhen , China with 373 skyscrapers; New York City , US with 314 skyscrapers; Dubai , UAE with 252 skyscrapers; Guangzhou , China with 188 skyscrapers; Shanghai , China with 183 skyscrapers; Tokyo , Japan with 168 skyscrapers; Kuala Lumpur , Malaysia with 156 skyscrapers; Wuhan , China with 149 skyscrapers; Chongqing , China, with 144 skyscrapers; Chicago , US, with 137 skyscrapers; Chengdu , China with 117 skyscrapers; Jakarta , Indonesia , with 112 skyscrapers; Bangkok , Thailand , with 111 skyscrapers, and Mumbai , India with 102. As of 2024, there are over 7 thousand skyscrapers over 150 m (492 ft) in height worldwide. The term "skyscraper"
14464-664: The world's tallest building for forty years. The first completed 417 m (1,368 ft) tall World Trade Center tower became the world's tallest building in 1972. However, it was overtaken by the Sears Tower (now Willis Tower ) in Chicago within two years. The 442 m (1,450 ft) tall Sears Tower stood as the world's tallest building for 24 years, from 1974 until 1998, until it was edged out by 452 m (1,483 ft) Petronas Twin Towers in Kuala Lumpur, which held
14592-432: The world's tallest building, New York took the lead by 1895 with the completion of the 103 m (338 ft) tall American Surety Building , leaving New York with the title of the world's tallest building for many years. Modern skyscrapers are built with steel or reinforced concrete frameworks and curtain walls of glass or polished stone . They use mechanical equipment such as water pumps and elevators . Since
14720-476: The world, although only partially iron framed, is The Flaxmill in Shrewsbury , England. Built in 1797, it is seen as the "grandfather of skyscrapers", since its fireproof combination of cast iron columns and cast iron beams developed into the modern steel frame that made modern skyscrapers possible. In 2013 funding was confirmed to convert the derelict building into offices. In 1857, Elisha Otis introduced
14848-491: The year. The average window for freezing temperatures is November 6 to April 2, allowing a growing season of 217 days. Early fall and late winter are generally dry, with February having the lowest average precipitation at 2.75 inches (70 mm). The dewpoint in the summer averages between 59.1 and 64.5 °F (15 and 18 °C). The highest recorded temperature was 106 °F (41 °C) on August 7, 1918. Temperatures at or above 100 °F (38 °C) are not common, with
14976-671: The years immediately following World War II. Early examples include Edificio España (Spain) and Torre Breda (Italy). From the 1930s onward, skyscrapers began to appear in various cities in East and Southeast Asia as well as in Latin America . Finally, they also began to be constructed in cities in Africa , the Middle East , South Asia , and Oceania from the late 1950s. Skyscraper projects after World War II typically rejected
15104-541: Was 30.7 in (78 cm), which occurred in January 1996. Precipitation is generally spread throughout the year, with eight to eleven wet days per month, at an average annual rate of 44.1 inches (1,120 mm), but historically ranging from 29.31 in (744 mm) in 1922 to 64.33 in (1,634 mm) in 2011. The most rain recorded in one day occurred on July 28, 2013, when 8.02 in (204 mm) fell at Philadelphia International Airport . Philadelphia has
15232-472: Was being constructed and prepared to serve as the new national capital. In 1793, the largest yellow fever epidemic in U.S. history killed approximately 4,000 to 5,000 people in Philadelphia, or about ten percent of the city's population at the time. The capital of the United States was moved to Washington, D.C. in 1800 upon completion of the White House and U.S. Capitol buildings. The state capital
15360-514: Was developed south of South Street and later occupied by succeeding immigrants. They established a network of Catholic churches and schools and dominated the Catholic clergy for decades. Anti- Irish , anti-Catholic nativist riots erupted in Philadelphia in 1844. The rise in population of the surrounding districts helped lead to the Act of Consolidation of 1854 , which extended the city limits from
15488-482: Was dominated by Georgian architecture , including Independence Hall and Christ Church . In the first decades of the 19th century, Federal and Greek Revival architecture were the dominant styles produced by Philadelphia architects such as Benjamin Latrobe , William Strickland , John Haviland , John Notman , Thomas Walter , and Samuel Sloan . Frank Furness is considered Philadelphia's greatest architect of
15616-621: Was first applied to buildings of steel-framed construction of at least 10 stories in the late 19th century, a result of public amazement at the tall buildings being built in major American cities like New York City , Philadelphia , Boston , Chicago , Detroit , and St. Louis . The first steel-frame skyscraper was the Home Insurance Building , originally 10 stories with a height of 42 m or 138 ft, in Chicago in 1885; two additional stories were added. Some point to Philadelphia's 10-story Jayne Building (1849–50) as
15744-424: Was in 17th-century Edinburgh , Scotland, where a defensive city wall defined the boundaries of the city. Due to the restricted land area available for development, the houses increased in height instead. Buildings of 11 stories were common, and there are records of buildings as high as 14 stories. Many of the stone-built structures can still be seen today in the old town of Edinburgh. The oldest iron framed building in
15872-529: Was moved from Philadelphia to Lancaster in 1799, then ultimately to Harrisburg in 1812. Philadelphia remained the nation's largest city until the late 18th century. It also was the nation's financial and cultural center until ultimately being eclipsed in total population by New York City in 1790. In 1816, the city's free Black community founded the African Methodist Episcopal Church , the first independent Black denomination in
16000-406: Was one of more than 36 industrial cities nationally to suffer a race riot during Red Summer in post- World War I unrest as recent immigrants competed with Blacks for jobs. In the 1920s, the public flouting of Prohibition laws, organized crime , mob violence, and corrupt police involvement in illegal activities led to the appointment of Brig. Gen. Smedley Butler of the U.S. Marine Corps as
16128-713: Was the textile industry . Major corporations in the 19th and early 20th centuries included the Baldwin Locomotive Works , William Cramp & Sons Shipbuilding Company , and the Pennsylvania Railroad . Established in 1870, the Philadelphia Conveyancers' Association was chartered by the state in 1871. Along with the U.S. Centennial in 1876, the city's industry was celebrated in the Centennial Exposition ,
16256-454: Was the concept of the "tube" structural system , including the "framed tube", "trussed tube", and "bundled tube". His "tube concept", using all the exterior wall perimeter structure of a building to simulate a thin-walled tube, revolutionized tall building design. These systems allow greater economic efficiency, and also allow skyscrapers to take on various shapes, no longer needing to be rectangular and box-shaped. The first building to employ
16384-613: Was the first steel-framed building with soaring vertical bands to emphasize the height of the building and is therefore considered to be the first early skyscraper. In 1889, the Mole Antonelliana in Italy was 197 m (549 ft) tall. Most early skyscrapers emerged in the land-strapped areas of New York City and Chicago toward the end of the 19th century. A land boom in Melbourne , Australia between 1888 and 1891 spurred
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