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109-613: The St Elmo Bridge is a single-span arched truss steel footbridge leading from the foreshore of Fort Saint Elmo in Valletta , Malta , to the breakwater at the entrance of the Grand Harbour . It was constructed in 2011–12 to designs of the Spanish architects Arenas & Asociados. The bridge stands on the site of an earlier bridge which had been built in 1906 and destroyed during World War II in 1941. The original bridge had

218-470: A Parker truss or Pratt truss than a true arch . In the Brown truss all vertical elements are under tension, with exception of the end posts. This type of truss is particularly suited for timber structures that use iron rods as tension members. See Lenticular truss below. This combines an arch with a truss to form a structure both strong and rigid. Most trusses have the lower chord under tension and

327-677: A covered bridge to protect the structure. In 1820, a simple form of truss, Town's lattice truss , was patented, and had the advantage of requiring neither high labor skills nor much metal. Few iron truss bridges were built in the United States before 1850. Truss bridges became a common type of bridge built from the 1870s through the 1930s. Examples of these bridges still remain across the US, but their numbers are dropping rapidly as they are demolished and replaced with new structures. As metal slowly started to replace timber, wrought iron bridges in

436-416: A truss allows the analysis of its structure using a few assumptions and the application of Newton's laws of motion according to the branch of physics known as statics . For purposes of analysis, trusses are assumed to be pin jointed where the straight components meet, meaning that taken alone, every joint on the structure is functionally considered to be a flexible joint as opposed to a rigid joint with

545-550: A Parker truss vary from near vertical in the center of the span to diagonal near each end, similar to a Warren truss. George H. Pegram , while the chief engineer of Edge Moor Iron Company in Wilmington, Delaware , patented this truss design in 1885. The Pegram truss consists of a Parker type design with the vertical posts leaning towards the center at an angle between 60 and 75°. The variable post angle and constant chord length allowed steel in existing bridges to be recycled into

654-516: A city with a population of fewer than 250,000 inhabitants. The plan is to put a covenant on the land and to encourage a civic consultation on redevelopment of the site. The current mayor is Inés Rey of PSdeG-PSOE . After the War of Independence (1808–1814), the fortunes of Ferrol began to deteriorate. The largest port in northern Spain, site of the Reales Astilleros de Esteiro , one of

763-594: A continuous truss functions as a single rigid structure over multiple supports. This means that the live load on one span is partially supported by the other spans, and consequently it is possible to use less material in the truss. Continuous truss bridges were not very common before the mid-20th century because they are statically indeterminate , which makes them difficult to design without the use of computers . A multi-span truss bridge may also be constructed using cantilever spans, which are supported at only one end rather than both ends like other types of trusses. Unlike

872-523: A continuous truss, a cantilever truss does not need to be connected rigidly, or indeed at all, at the center. Many cantilever bridges, like the Quebec Bridge shown below, have two cantilever spans supporting a simple truss in the center. The bridge would remain standing if the simple truss section were removed. Bridges are the most widely known examples of truss use. There are many types, some of them dating back hundreds of years. Below are some of

981-435: A conventional truss into place or by building it in place using a "traveling support". In another method of construction, one outboard half of each balanced truss is built upon temporary falsework. When the outboard halves are completed and anchored the inboard halves may then be constructed and the center section completed as described above. The Fink truss was designed by Albert Fink of Germany in 1854. This type of bridge

1090-474: A design similar to the present one, but it had two spans instead of one. In the 19th and 20th centuries, the Grand Harbour was a major British naval base. In 1900 the Admiralty began making plans to construct a breakwater so as to protect the harbour from both the rough seas as well as potential enemy intrusion. The breakwater was built out of limestone and concrete , and it consisted of two sections with

1199-428: A few being captured. The collapsed span was removed after the attack, and the rest of the bridge was subsequently demolished after the war. All that remained were the stone abutments on either side and parts of the central columns. The breakwater and lighthouse were subsequently only accessible by boat. The intention to construct a replica of the bridge on the site was announced in 2007. However, it became apparent that

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1308-557: A few garrisons, and the city was no more than a village amidst Roman ruins, the invaders showed the same lack of interest in the ruined city as they did generally for the region. As the city began to recover during the Middle Ages the main problem for the inhabitants was the Norman raids, as well as the ever-present threat of raids ( razzias ) from Al-Andalus to the south. During the 9th century there were several Viking attacks on

1417-605: A lack of durability, and gave way to the Pratt truss design, which was stronger. Again, the bridge companies marketed their designs, with the Wrought Iron Bridge Company in the lead. As the 1880s and 1890s progressed, steel began to replace wrought iron as the preferred material. Other truss designs were used during this time, including the camel-back. By the 1910s, many states developed standard plan truss bridges, including steel Warren pony truss bridges. In

1526-527: A large gulf on the Atlantic Ocean. It is the main industrial and financial centre of northern Galicia, and holds the headquarters of the Universidade da Coruña . A Coruña is the Spanish city featuring the tallest mean-height of buildings, also featuring a population density of 21,972 inhabitants per square kilometre (56,910/sq mi) of built land area. There is no clear evidence as to what

1635-408: A lighthouse on each end. The larger arm of the breakwater was linked to the foreshore near Fort Saint Elmo , with the smaller one being linked to Fort Ricasoli . The tender to construct the breakwater was issued in 1902, and it was won by S. Pearson & Sons . The foundation stone was laid down by King Edward VII on 20 April 1903, and work began in 1905 and was completed in 1910. The total cost of

1744-477: A lower chord (functioning as a suspension cable) that curves down and then up to meet at the same end points. Where the arches extend above and below the roadbed, it is called a lenticular pony truss bridge . The Pauli truss bridge is a specific variant of the lenticular truss, but the terms are not interchangeable. One type of lenticular truss consists of arcuate upper compression chords and lower eyebar chain tension links. Brunel 's Royal Albert Bridge over

1853-438: A massive influx of Galician-speaking rural dwellers, into their quickly developed neighbourhoods. The period between 1960 and 1980 saw a big transformation in most areas of the city from being agricultural dwellings to urban districts. The international oil shocks of the mid and late 1970s severely disrupted the economy, causing many bankruptcies and high unemployment until the mid-1980s, when slower but steady economic development

1962-726: A new span using the Pegram truss design. This design also facilitated reassembly and permitted a bridge to be adjusted to fit different span lengths. There are twelve known remaining Pegram span bridges in the United States with seven in Idaho , two in Kansas , and one each in California , Washington , and Utah . The Pennsylvania (Petit) truss is a variation on the Pratt truss . The Pratt truss includes braced diagonal members in all panels;

2071-601: A pair of cylindrical steel columns filled with concrete. On the night of 25–26 July 1941, during World War II , the Decima Flottiglia MAS of the Italian Regia Marina launched an attack on the harbour using MAS motorboats, MT explosive motorboats and SLC Maiale human torpedoes . One of the SLCs was supposed to attack the bridge, which had nets blocking the entrance to the harbour, allowing

2180-490: A population density of around 6,700 inhabitants per square kilometer. In 2010, there were 12,344 foreigners living in the city, representing 5% of the total population. The main nationalities are Brazilians (10%), Colombians (8%) and Peruvians (7%). By language, according to 2008 data, 7.75% of the population speak Galician as a primary language, 36% speak Spanish and the rest use both interchangeably. The A Coruña metropolitan area has 431,332 inhabitants. The city

2289-428: A reconstruction in accordance with the original design would not be financially feasible due to the quantity of steel required. When a tender for design, fabrication and construction of the bridge was issued on 18 September 2009, it called for a single-span bridge with a new design echoing the style of the original. The construction of a new bridge formed part of a larger project to regenerate Valletta, which also included

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2398-594: A similar rate to other major Galician cities, but it was after the death of Francisco Franco when the city of A Coruña (and Vigo) left all the other Galician cities behind. The meteoric increase in the population of the City of A Coruña during the years which followed the Spanish Civil War in the mid-20th century was accompanied by the decline in the villages and hamlets of the province as it industrialized. The municipality of A Coruña has 247,604 inhabitants and

2507-445: A strike; before the collapse, similar incidents had been common and had necessitated frequent repairs. Truss bridges consisting of more than one span may be either a continuous truss or a series of simple trusses. In the simple truss design, each span is supported only at the ends and is fully independent of any adjacent spans. Each span must fully support the weight of any vehicles traveling over it (the live load ). In contrast,

2616-545: A variant of the lenticular truss, "with the top chord carefully shaped so that it has a constant force along the entire length of the truss." It is named after Friedrich Augustus von Pauli  [ de ] , whose 1857 railway bridge (the Großhesseloher Brücke  [ de ] ) spanned the Isar near Munich . ( See also Grosshesselohe Isartal station .) The term Pauli truss is not interchangeable with

2725-700: Is a Pratt truss design with a polygonal upper chord. A "camelback" is a subset of the Parker type, where the upper chord consists of exactly five segments. An example of a Parker truss is the Traffic Bridge in Saskatoon , Canada. An example of a camelback truss is the Woolsey Bridge near Woolsey, Arkansas . Designed and patented in 1872 by Reuben Partridge , after local bridge designs proved ineffective against road traffic and heavy rains. It became

2834-561: Is a city and municipality in Galicia , Spain. It is Galicia's second largest city, behind Vigo . The city is the provincial capital of the province of A Coruña , having also served as political capital of the Kingdom of Galicia from the 16th to the 19th centuries, and as a regional administrative centre between 1833 and 1982. A Coruña is located on a promontory in the Golfo Ártabro ,

2943-519: Is a hybrid between a Warren truss and a double-intersection Pratt truss. Invented in 1863 by Simeon S. Post, it is occasionally referred to as a Post patent truss although he never received a patent for it. The Ponakin Bridge and the Bell Ford Bridge are two examples of this truss. A Pratt truss includes vertical members and diagonals that slope down towards the center, the opposite of

3052-541: Is a street in present A Coruña called "Calle de la Sinagoga", or "synagogue street", which is believed to be the street where the synagogue once stood. During the Modern period , the city was a port and centre for the manufacturing of textiles. In 1520, king Carlos I of Spain , met in the courts of A Coruña and embarked from its harbour to be elected Emperor of the Holy Roman Empire (as Charles V). He allowed

3161-612: Is another town named Coruña in Burgos Province . A more likely possibility is that the name simply means "The Crown", which in Galician is A Coroa and in Spanish is La Corona . It seems less likely that it traces back to the Galician clunia . The name is reputedly from the Greek Κορώνα (Crown), referring to the crown of Geryon that was buried by Hercules under the lighthouse he built to his honour. The hero Hercules slew

3270-456: Is in a constant decline, in favor of the official and historical form "A Coruña". A Coruña is located on a peninsula, and its isthmus was at times formed only by a small strip of sand. Erosion and sea currents caused a progressive accumulation of sand, enlarging it to its present dimensions. A Coruña has a warm-summer Mediterranean climate ( Csb ) in the Köppen climate classification . Autumn

3379-832: Is named after the K formed in each panel by the vertical member and two oblique members. Examples include the Südbrücke rail bridge over the River Rhine, Mainz, Germany, the bridge on I-895 (Baltimore Harbor Tunnel Thruway) in Baltimore, Maryland, the Long–Allen Bridge in Morgan City, Louisiana (Morgan City Bridge) with three 600-foot-long spans, and the Wax Lake Outlet bridge in Calumet, Louisiana One of

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3488-695: Is practical for use with spans up to 250 feet (76 m) and was a common configuration for railroad bridges as truss bridges moved from wood to metal. They are statically determinate bridges, which lend themselves well to long spans. They were common in the United States between 1844 and the early 20th century. Examples of Pratt truss bridges are the Governor's Bridge in Maryland ; the Hayden RR Bridge in Springfield, Oregon , built in 1882;

3597-525: Is the Victoria Bridge on Prince Street, Picton, New South Wales . Also constructed of ironbark, the bridge is still in use today for pedestrian and light traffic. The Bailey truss was designed by the British in 1940–1941 for military uses during World War II. A short selection of prefabricated modular components could be easily and speedily combined on land in various configurations to adapt to

3706-556: Is the site of the Roman Tower of Hercules , a lighthouse which has been in continuous operation since possibly the 2nd century AD. It has been declared by UNESCO as a World Heritage Site . It is surrounded by a large public park with a golf course and the so-called Moor's Graveyard ( Cemiterio do Mouro in Galician, Cementerio del Moro in Spanish) a building where in fact there were never burials, Muslim or not, which now houses

3815-611: Is used in the teaching of statics, by the building of model bridges from spaghetti . Spaghetti is brittle and although it can carry a modest tension force, it breaks easily if bent. A model spaghetti bridge thus demonstrates the use of a truss structure to produce a usefully strong complete structure from individually weak elements. In the United States , because wood was in abundance, early truss bridges would typically use carefully fitted timbers for members taking compression and iron rods for tension members , usually constructed as

3924-497: Is usually mild with spring-like temperatures, but winter is often unsettled and unpredictable, with strong winds and abundant rainfall coming from Atlantic depressions . The ocean keeps temperatures mild all year round (the variation between winter and summer temperatures is only 9 °C (16 °F) on average) and therefore frost and snow are extremely rare. In fact, the city has not received significant snowfall since January 1987. A Coruña lies in plant hardiness zone 10b. Spring

4033-521: Is usually warm and fairly calm, while summers are mostly sunny and humid, with occasional rainfall, usually in the form of drizzle ; high temperatures are warm but rarely uncomfortably hot because of the sea's cooling influence during the day, most often being around 22 °C (72 °F) between July and September. Even the warmest month on record was relatively subdued, being August 2003, with an average high temperature of 25 °C (77 °F). Temperatures above 25 °C (77 °F) occur many days in

4142-478: The Casa das Palabras (Galician for House of Words) museum. The lighthouse features as the main emblem of the city's flag and coat of arms. The city is also well known for its characteristic glazed window balconies, called galerías . Originally, this type of structure came about as a naval architecture solution for the challenging weather, particularly designed for rainy days. This fashion started in nearby Ferrol in

4251-621: The Dearborn River High Bridge near Augusta, Montana, built in 1897; and the Fair Oaks Bridge in Fair Oaks, California , built 1907–09. The Scenic Bridge near Tarkio, Montana , is an example of a Pratt deck truss bridge, where the roadway is on top of the truss. The queenpost truss , sometimes called "queen post" or queenspost, is similar to a king post truss in that the outer supports are angled towards

4360-1316: The Fort Wayne Street Bridge in Goshen, Indiana , the Schell Bridge in Northfield, Massachusetts , the Inclined Plane Bridge in Johnstown, Pennsylvania , the Easton–Phillipsburg Toll Bridge in Easton, Pennsylvania , the Connecticut River Bridge in Brattleboro, Vermont , the Metropolis Bridge in Metropolis, Illinois , and the Healdsburg Memorial Bridge in Healdsburg, California . A Post truss

4469-495: The Howe truss . The interior diagonals are under tension under balanced loading and vertical elements under compression. If pure tension elements (such as eyebars ) are used in the diagonals, then crossing elements may be needed near the center to accept concentrated live loads as they traverse the span. It can be subdivided, creating Y- and K-shaped patterns. The Pratt truss was invented in 1844 by Thomas and Caleb Pratt. This truss

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4578-600: The Low Countries and England, where it was defeated. In the following year, during the Anglo-Spanish War , the English Armada conducted a besieged A Coruña , but was eventually forced to withdraw. A local woman, María Pita , took her dead husband's spear during the siege and killed an enemy captain, rallying support to deny a breach in the wall to the attackers. In the 16th and 17th centuries,

4687-481: The River Tamar between Devon and Cornwall uses a single tubular upper chord. As the horizontal tension and compression forces are balanced these horizontal forces are not transferred to the supporting pylons (as is the case with most arch types). This in turn enables the truss to be fabricated on the ground and then to be raised by jacking as supporting masonry pylons are constructed. This truss has been used in

4796-660: The Roman Empire , A Coruña still had a commercial port connected to foreign countries, but contacts with the Mediterranean were slowly replaced by a more Atlantic-oriented focus. The process of deurbanisation that followed the fall of the Roman Empire also affected A Coruña. Between the 7th and 8th centuries, the city was no more than a little village of labourers and sailors. The 11th-century Chronica iriense names Faro do Burgo (ancient name of A Coruña) as one of

4905-747: The Royal Galician Academy , the institution dedicated to the study of Galician culture and especially the Galician language, the Romanesque churches of Santiago and Saint Mary, As Bárbaras Monastery (Romanesque and Baroque ) and the headquarters of the Operational Logistics Force of the Spanish Army . In July, a Medieval Fair takes place in the streets of the Old City. The city has several museums, such as

5014-719: The Spanish Constitution of 1812 . He was supported by the bourgeoisie and the educated people. But on 22 August he was betrayed and hanged in the Campo da Leña two months later. A Coruña supported the liberal side in all the 19th-century rebellions. A Coruña also played an important role in the Rexurdimento , and there were founded the Galician Royal Academy in 1906 and the Brotherhoods of

5123-598: The Spanish colonies in Latin America succeeded in gaining independence from their former metropolis . The population of the City of A Coruña in 1900 reached 43,971, while the population of the rest of the province including the City and Naval Station of nearby Ferrol as well as Santiago de Compostela was 653,556. A Coruña's miraculous growth happened during the aftermath of the Spanish Civil War at

5232-406: The 15th century. In 1208, Alfonso IX re-founded the city of Crunia . Some privileges, such as those of disembarking and selling salt without paying taxes, were granted to the city, and it enjoyed a big growth in fishing and mercantile business. The city grew and extended through the isthmus. In 1446 John II of Castile granted to A Coruña the title of "City". The Catholic Monarchs established

5341-524: The 18th century when some of the technicians working for the Royal Dockyards had the idea of using the shape of the back of a warship in a modern building. Soon afterward, most seaports in northern Spain, were adding these glazed window balconies to their city-port houses. The Old Town ( Ciudad Vieja in Spanish, Cidade Vella in Galician) is the name given to the oldest part of A Coruña. During

5450-412: The 1920s and 1930s, Pennsylvania and several states continued to build steel truss bridges, using massive steel through-truss bridges for long spans. Other states, such as Michigan , used standard plan concrete girder and beam bridges, and only a limited number of truss bridges were built. The truss may carry its roadbed on top, in the middle, or at the bottom of the truss. Bridges with the roadbed at

5559-427: The 2011 Municipal Elections, the conservative candidate Carlos Negreira ( PP ) obtained a majority, the first one for the People's Party in the city since the arrival of democracy. The mayor of the 2015–2019 mandate was Xulio Ferreiro, from the Marea Atlántica ("Atlantic Tide") party, who was elected in 2015 on an anti-corruption mandate. His remit was to improve the town planning of the city rather than to leave it to

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5668-462: The Castle of San Antón Archaeological Museum, Fine Arts Museum and the network of scientific museums ( Casa das Ciencias , which also includes a planetarium, DOMUS, made by Arata Isozaki and Aquarium Finisterrae ). In 2012, the National Museum of Science and Technology (MUNCYT) opened a branch in the city. A Coruña's social scene is most popular on Summer nights. Most bars and clubs are on Rua do Orzán, which runs directly parallel to Paseo Maritimo on

5777-409: The Cidade (City), is built on an ancient Celtic castro. It was supposedly inhabited by the Brigantes and Artabrians , the Celtic tribes of the area. The Romans came to the region in the 2nd century BCE; they made the most of the strategic position and soon the city became quite important in maritime trade. In 62 BCE Julius Caesar came to the city (known at the time as Brigantium) in pursuit of

5886-514: The European-funded Maritime Promenade and the city's Scientific Museums (Casa das Ciencias-Planetario-, Casa dos Peixes-Aquarium and Casa do Home-Domus). On 20 January 2006 Vázquez was named ambassador to the Vatican City , and was later replaced by Francisco Javier Losada de Azpiazu. In 2007 Municipal Elections the local government was a coalition of the Socialists' Party of Galicia and the left-wing nationalist Galician Nationalist Bloc party. The city celebrated its first millennium in 2008. In

5995-416: The Galician Language in 1916. Regarding the economy, in 1804 the National Cigarette Factory was founded, and there the workers' movement of the city had its origins. During the 19th century other businesses (glass, foundries, textiles, gas, matches, etc.) were slowly established, but it was maritime trade and migrant travel that attracted Catalan, Belgian, French and English investments. The Bank of A Coruña

6104-420: The Jews in 1492 , a thriving Jewish community created a rich artistic heritage in the city. The most lavishly illuminated Hebrew Bible in medieval Spain was created in A Coruña in 1476. Known as the Kennicott Bible , it is currently housed in the Bodleian Library, Oxford . The Jewish community is said to have dated to at least the 11th century, with fragments of Jewish tombstones dating to that time period. There

6213-421: The Latin word Colonya as its origin, where the L was transformed into R which occurs widely in Portuguese. A similar happening can be found today in Coronie , a Surinamese town which also made its course outside the Portuguese system. A folk etymology incorrectly derives Coruña from the ancient columna , or Tower of Hercules . In English, use of the Spanish or Galician forms now predominates. However,

6322-427: The Pennsylvania truss adds to this design half-length struts or ties in the top, bottom, or both parts of the panels. It is named after the Pennsylvania Railroad , which pioneered this design. It was once used for hundreds of bridges in the United States, but fell out of favor in the 1930s and very few examples of this design remain. Examples of this truss type include the Lower Trenton Bridge in Trenton, New Jersey ,

6431-412: The Royal Audience of the Kingdom of Galicia in the city, instead of Santiago . A Coruña also became the headquarters of the Captaincy General . Later, in 1522, Charles V conceded to the city of A Coruña the license to establish the House of Spices , being this the port chosen by Jofre Garcia de Loysa to set his expedition to conquer the Moluccans . In the late Middle Ages, before the expulsion of

6540-399: The US started being built on a large scale in the 1870s. Bowstring truss bridges were a common truss design during this time, with their arched top chords. Companies like the Massillon Bridge Company of Massillon, Ohio , and the King Bridge Company of Cleveland , became well-known, as they marketed their designs to cities and townships. The bowstring truss design fell out of favor due to

6649-414: The already established Castillian - Spanish social dominance and extending the equally deep-rooted prejudice against Galician language and cultural expression. Another downside's of Mr Vazquez legacy would be his town-planning policies, with big-money pharaoh-like projects with little social impact (shopping centres, Millennium obelisk, etc.). However, on a positive note Mr Vazquez's 23 year-long mandate saw

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6758-454: The balance between labor, machinery, and material costs has certain favorable proportions. The inclusion of the elements shown is largely an engineering decision based upon economics, being a balance between the costs of raw materials, off-site fabrication, component transportation, on-site erection, the availability of machinery, and the cost of labor. In other cases, the appearance of the structure may take on greater importance and so influence

6867-438: The breakwater was around £1 million. It was deemed necessary to have a 70-metre-long (230 ft) gap between the larger section of the breakwater and the St Elmo foreshore, so as to prevent water inside the harbour from becoming stagnant and also allow small vessels to take a quicker route to the harbour. A steel footbridge was constructed across this gap in 1906, and it consisted of two spans of arched truss beams supported on

6976-425: The bridge illustrated in the infobox at the top, vertical members are in tension, lower horizontal members in tension, shear , and bending, outer diagonal and top members are in compression, while the inner diagonals are in tension. The central vertical member stabilizes the upper compression member, preventing it from buckling . If the top member is sufficiently stiff then this vertical element may be eliminated. If

7085-415: The bridge in a suicide mission. The craft hit one of the bridge's columns, and it detonated the explosives in the first boat, causing one of the spans to collapse. This did not allow access to the harbour; on the contrary the collapsed span ended up completely blocking the entrance. The coastal batteries of Fort Saint Elmo subsequently opened fire on the attackers, and most of the vessels were destroyed, with

7194-666: The center of the structure. The primary difference is the horizontal extension at the center which relies on beam action to provide mechanical stability. This truss style is only suitable for relatively short spans. The Smith truss , patented by Robert W Smith on July 16, 1867, has mostly diagonal criss-crossed supports. Smith's company used many variations of this pattern in the wooden covered bridges it built. A Coru%C3%B1a A Coruña ( Galician pronunciation: [ɐ koˈɾuɲɐ] ; Spanish : La Coruña [la koˈɾuɲa] ; also informally called just Coruña ; historical English: Corunna or The Groyne)

7303-493: The center, the opposite of the Pratt truss . In contrast to the Pratt truss, the diagonal web members are in compression and the vertical web members are in tension. Few of these bridges remain standing. Examples include Jay Bridge in Jay, New York ; McConnell's Mill Covered Bridge in Slippery Rock Township, Lawrence County, Pennsylvania ; Sandy Creek Covered Bridge in Jefferson County, Missouri ; and Westham Island Bridge in Delta, British Columbia , Canada. The K-truss

7412-444: The city, called at that time Faro or Faro Bregancio. In the year 991, King Vermudo II began the construction of defensive military positions on the coast. At Faro, in the ruins of the Tower of Hercules , a fortress was built, which had a permanent military garrison. To pay for it, he gave power over the city to the bishop of Santiago . The bishop of Santiago became the most important political post in Galicia , and remained so until

7521-449: The columns were also retained, although they are not connected to the modern bridge. The bridge was designed by the Spanish architects Arenas & Asociados, and it was fabricated at A Coruña before being shipped to Malta on board the Storman Asia . Bezzina & Cole Architects along with the contractor Vassallo Builders were responsible for putting the bridge in place, and the installation took place on 5 October 2011. The lighting system

7630-414: The compression members and to control deflection. It is mainly used for rail bridges, showing off a simple and very strong design. In the Pratt truss the intersection of the verticals and the lower horizontal tension members are used to anchor the supports for the short-span girders under the tracks (among other things). With the Baltimore truss, there are almost twice as many points for this to happen because

7739-399: The construction of a stadium, with the upper chords of parallel trusses supporting a roof that may be rolled back. The Smithfield Street Bridge in Pittsburgh, Pennsylvania , is another example of this type. An example of a lenticular pony truss bridge that uses regular spans of iron is the Turn-of-River Bridge designed and manufactured by the Berlin Iron Bridge Co. The Pauli truss is

7848-429: The design decisions beyond mere matters of economics. Modern materials such as prestressed concrete and fabrication methods, such as automated welding , and the changing price of steel relative to that of labor have significantly influenced the design of modern bridges. A pure truss can be represented as a pin-jointed structure, one where the only forces on the truss members are tension or compression, not bending. This

7957-513: The dioceses that king Miro granted to the episcopate of Iria Flavia in the year 572: The Muslim invasion of the Iberian peninsula left no archaeological evidence in the northwest, so it cannot be said whether or not the Muslim invaders ever reached the city. As Muslim rule in early 8th century Galicia consisted little more than a short-lived overlordship of the remote and rugged region backed by

8066-484: The earliest examples is the Old Blenheim Bridge , which with a span of 210 feet (64 m) and a total length of 232 feet (71 m) long was the second-longest covered bridge in the United States, until its destruction from flooding in 2011. The Busching bridge, often erroneously used as an example of a Long truss, is an example of a Howe truss, as the verticals are metal rods. A Parker truss bridge

8175-633: The elections, the republican parties obtained 34 of the 39 council seats. The best results were of the ORGA and of the Partido Radical Socialista, and the Radical Republican Party lost a lot of support. From 1983 to 2006, the mayor of the city was Francisco Vázquez Vázquez ( PSOE ), and the city became devoted to services, but he also was criticised because of his being openly against Galician nationalism , favouring

8284-703: The fourteenth century, the scarcely-surviving city walls of the Old Town were built, as well as three harbors: the Parrot and San Miguel. It also preserves the stronghold known as the Old Fortress, now converted into the Garden of San Carlos, in which Sir John Moore is buried. The Old City of A Coruña kept streets and squares that revive the city's history and noble mansions and residences such as Rosalia de Castro's house, located on Prince Street. Notable buildings are

8393-495: The giant tyrant Geryon after three days and three nights of continuous battle. Hercules then—in a Celtic gesture—buried the head of Geryon with his weapons and ordered that a city be built on the site. The lighthouse atop a skull and crossbones representing the buried head of Hercules' slain enemy appears in the coat-of-arms of the city of A Coruña, Loukeris (2019). A proxy evolution within the Portuguese language points out to

8502-698: The government of the Kingdom of Galicia to distribute spice in Europe between 1522 and 1529. Commerce with the Indies was allowed between 1529 and 1575. San Antón Castle was built to defend of the city and its harbour. From the port of Ferrol in the Province of A Coruña , Philip II left to marry Mary I of England in 1554, and much later, in 1588, from the same port the Spanish Armada would set sail to

8611-482: The lower chord (a horizontal member of a truss) is sufficiently resistant to bending and shear, the outer vertical elements may be eliminated, but with additional strength added to other members in compensation. The ability to distribute the forces in various ways has led to a large variety of truss bridge types. Some types may be more advantageous when the wood is employed for compression elements while other types may be easier to erect in particular site conditions, or when

8720-415: The mercy of corrupt, unregulated free-market policies which have left a negative legacy in many areas of the municipality. He has widespread support across the region in opposition to a project to sell off the city's port (a legacy of the preceding mayor Carlos Negreira) to a private equity firm, which wants to construct a gated community of high-rise apartment blocks for which there is no real market demand in

8829-587: The metal trade, establishing commerce with what are now France, England and Portugal. The town began to grow, mainly during the 1st and 2nd centuries (when the Farum Brigantium Tower of Hercules was built), but declined after the 4th century and particularly with the incursions of the Vikings , which forced the population to flee towards the interior of the Estuary of O Burgo. After the fall of

8938-515: The more common designs. The Allan truss , designed by Percy Allan , is partly based on the Howe truss . The first Allan truss was completed on 13 August 1894 over Glennies Creek at Camberwell, New South Wales and the last Allan truss bridge was built over Mill Creek near Wisemans Ferry in 1929. Completed in March 1895, the Tharwa Bridge located at Tharwa, Australian Capital Territory ,

9047-550: The name derives from. It seems to be from Crunia , of unknown origin and meaning, documented for the first time at the time of Ferdinand II of León (reigned 1157–1188). As usual in Galician-Portuguese (as well as in Castilian Spanish), the cluster ni naturally evolved into the sound [ ɲ ] , written n , nn or nh in old Galician orthography, nn in Spanish (later abbreviated to ñ , like

9156-412: The needs at the site and allow rapid deployment of completed trusses. In the image, note the use of pairs of doubled trusses to adapt to the span and load requirements. In other applications the trusses may be stacked vertically, and doubled as necessary. The Baltimore truss is a subclass of the Pratt truss. A Baltimore truss has additional bracing in the lower section of the truss to prevent buckling in

9265-512: The ninth and tenth centuries, the inhabitants of what was then called Faro Island (peninsula where the Tower of Hercules stands) were leaving the area due to constant attacks by the Viking fleet and settled in the area of Betanzos. In 1208 King Alfonso IX refounded the city at the present site of the Old Town and put it under his personal control, free from allegiance to the clergy or feudal lords. In

9374-521: The original Latin cluster "nn"), and nh in Portuguese and alternative Galician spelling. " A " is the Galician-Portuguese article equivalent to English the ; compare Castilian Spanish la ("the"). One proposed etymology derives Crunia from Cluny , the town in France. During its height ( c.  950  – c.  1130 ) the Cluniac religious movement became very prominent in Europe. There

9483-471: The original appearance of the breakwater, while critics disapproved of the cost of construction and called it a " bridge to nowhere ." Since its inauguration it has become a landmark, and it has occasionally suffered damage to its decking or railings, which have resulted in it being closed to the public for some periods of time to allow for repair works. [REDACTED] Media related to St. Elmo Bridge at Wikimedia Commons Truss bridge The nature of

9592-463: The other vessels to enter the breach and attack naval shipping inside the harbour. The element of surprise was lost when the British detected the impending attack using radar, which the Italians had not anticipated. The attack on the bridge was launched at 04:46 on 26 July. The explosives in the first craft did not detonate, prompting the pilot of another craft to smash his explosive motorboat against

9701-472: The reconstruction of City Gate and the Barrakka Lift , among other projects. The single-span steel bridge weighs 190 tonnes (190 long tons; 210 short tons), and it is 70 metres (230 ft) long and 5.5 metres (18 ft) wide. It has an asymmetrical L-shaped cross section, with an arched truss facing the seaward side. It is supported on the stone abutments of the original bridge, and the remains of

9810-474: The roadbed but are not connected, a pony truss or half-through truss. Sometimes both the upper and lower chords support roadbeds, forming a double-decked truss . This can be used to separate rail from road traffic or to separate the two directions of road traffic. Since through truss bridges have supports located over the bridge deck, they are susceptible to being hit by overheight loads when used on highways. The I-5 Skagit River bridge collapsed after such

9919-574: The short verticals will also be used to anchor the supports. Thus the short-span girders can be made lighter because their span is shorter. A good example of the Baltimore truss is the Amtrak Old Saybrook – Old Lyme Bridge in Connecticut , United States. The Bollman Truss Railroad Bridge at Savage, Maryland , United States is the only surviving example of a revolutionary design in the history of American bridge engineering. The type

10028-451: The simplest truss styles to implement, the king post consists of two angled supports leaning into a common vertical support. This type of bridge uses a substantial number of lightweight elements, easing the task of construction. Truss elements are usually of wood, iron, or steel. A lenticular truss bridge includes a lens-shape truss, with trusses between an upper chord functioning as an arch that curves up and then down to end points, and

10137-454: The standard for covered bridges built in central Ohio in the late 1800s and early 1900s. The Pegram truss is a hybrid between the Warren and Parker trusses where the upper chords are all of equal length and the lower chords are longer than the corresponding upper chord. Because of the difference in upper and lower chord length, each panel is not square. The members which would be vertical in

10246-414: The strength to maintain its shape, and the resulting shape and strength of the structure are only maintained by the interlocking of the components. This assumption means that members of the truss (chords, verticals, and diagonals) will act only in tension or compression. A more complex analysis is required where rigid joints impose significant bending loads upon the elements, as in a Vierendeel truss . In

10355-428: The summer, while temperatures above 30 °C (86 °F) are infrequent. A Coruña has five parishes, or parroquias : A Coruña, San Vicente de Elviña, Santa María de Oza, San Cristóbal das Viñas, and San Pedro de Visma. A Coruña spread from the peninsula, the site of the later Tower of Hercules , onto the mainland. The oldest part, known popularly in Galician as Cidade Vella (Old City), Cidade Alta (High City) or

10464-481: The term lenticular truss and, according to Thomas Boothby, the casual use of the term has clouded the literature. The Long truss was designed by Stephen H. Long in 1830. The design resembles a Howe truss , but is entirely made of wood instead of a combination of wood and metal. The longest surviving example is the Eldean Covered Bridge north of Troy, Ohio , spanning 224 feet (68 m). One of

10573-441: The three Royal Royal Dockyards together with Cartagena and Cádiz , almost became a "dead" town during the reign of Ferdinand VII . By 1833, the City and Naval Station of Ferrol saw its civilian population reduced to 13,000. During the administration of the marquess of Molina, Minister for Naval affairs in the mid-19th century new activities sprang up, but Ferrol never fully returned to its former glory. During those years, most of

10682-542: The top or the bottom are the most common as this allows both the top and bottom to be stiffened, forming a box truss . When the roadbed is atop the truss, it is a deck truss; an example of this was the I-35W Mississippi River bridge . When the truss members are both above and below the roadbed it is called a through truss; an example of this is the Pulaski Skyway , and where the sides extend above

10791-655: The traditional English form Corunna / k ə ˈ r ʌ n ə / is still often used in the UK, particularly in reference to the Battle of Corunna (1809) in the Peninsular War . Archaically, English-speakers knew the city as "The Groyne", probably from French La Corogne . In Spain, the official form of the name is now the Galician one: "A Coruña", though many Spaniards continue to use "La Coruña". Despite this, "La Coruña"

10900-428: The upper chord under compression. In a cantilever truss the situation is reversed, at least over a portion of the span. The typical cantilever truss bridge is a "balanced cantilever", which enables the construction to proceed outward from a central vertical spar in each direction. Usually these are built in pairs until the outer sections may be anchored to footings. A central gap, if present, can then be filled by lifting

11009-720: The wars of the Spanish monarchy caused a great increase in taxes and the start of conscription. In 1620, Philip III created the School of the Boys of the Sea. In 1682 the Tower of Hercules was restored by Antúnez. On 16 January 1809, A Coruña was the site of the Battle of Corunna during the Peninsular War , in which British troops fought against the French to cover the embarkation of British troops after their retreat. In this battle Sir John Moore

11118-414: Was also easy to assemble. Wells Creek Bollman Bridge is the only other bridge designed by Wendel Bollman still in existence, but it is a Warren truss configuration. The bowstring truss bridge was patented in 1841 by Squire Whipple . While similar in appearance to a tied-arch bridge , a bowstring truss has diagonal load-bearing members: these diagonals result in a structure that more closely matches

11227-519: Was designed by Anthony Magro of Calleja Limited. The project cost €2.8 million. The bridge was designed to last for 120 years. The bridge was inaugurated on 24 July 2012 by Austin Gatt , the Minister for Infrastructure, Transport and Communications, and it was subsequently opened to the public. The bridge received mixed reactions from the public, with some praising its design and the fact that it restored

11336-492: Was founded in 1857. The new provincial division of 1832 also influenced economic development. At the beginning of the 20th century, A Coruña had about 45,000 inhabitants. The Great Depression and the Spanish Civil War severely affected the economy through the 1930s to the mid-1950s. The 1960s and early 1970s saw a dramatic economic recovery, which was part of the wider Spanish Miracle . As elsewhere in Galicia, A Coruña attracted

11445-399: Was killed. Spanish resistance during the war in Galicia was led by Sinforiano López, and A Coruña was the only Galician city that achieved success against the French troops. French troops left Galicia at the end of May 1809. During the 19th century, the city was the centre of anti-monarchist sentiment. On 19 August 1815, Juan Díaz Porlier , pronounced against Fernando VII in defense of

11554-405: Was named after its inventor, Wendel Bollman , a self-educated Baltimore engineer. It was the first successful all-metal bridge design (patented in 1852) to be adopted and consistently used on a railroad. The design employs wrought iron tension members and cast iron compression members. The use of multiple independent tension elements reduces the likelihood of catastrophic failure. The structure

11663-683: Was popular with the Baltimore and Ohio Railroad . The Appomattox High Bridge on the Norfolk and Western Railway included 21 Fink deck truss spans from 1869 until their replacement in 1886. There are also inverted Fink truss bridges such as the Moody Pedestrian Bridge in Austin, Texas. The Howe truss , patented in 1840 by Massachusetts millwright William Howe , includes vertical members and diagonals that slope up towards

11772-532: Was resumed. In the Spanish general elections, 1931 , all the political parties knew that the electoral results had important political consequences. The campaign of Unión Monárquica was very important in A Coruña and was supported by El Ideal Gallego . Republicans and socialists constituted a block, made up of ORGA, independent republicans, Spanish Socialist Workers' Party (PSOE) and the Radical Socialist Republican Party . In

11881-848: Was the second Allan truss bridge to be built, the oldest surviving bridge in the Australian Capital Territory and the oldest, longest continuously used Allan truss bridge. Completed in November 1895, the Hampden Bridge in Wagga Wagga, New South Wales , Australia, the first of the Allan truss bridges with overhead bracing, was originally designed as a steel bridge but was constructed with timber to reduce cost. In his design, Allan used Australian ironbark for its strength. A similar bridge also designed by Percy Allen

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