In engineering , span is the distance between two adjacent structural supports (e.g., two piers ) of a structural member (e.g., a beam ). Span is measured in the horizontal direction either between the faces of the supports ( clear span ) or between the centers of the bearing surfaces ( effective span ):
6-567: Over Bridge , also known as Telford's Bridge , is a single span stone arch bridge spanning the canalised West Channel of the River Severn near Gloucester , England. It links Over to Alney Island . Although there was a crossing at Over recorded in the Domesday Book , this bridge was built by Thomas Telford between 1825 and 1828, to carry traffic east–west. It was opened in 1830 and remained in use for traffic until 1974. Until
12-545: A corne de vache (French for cow's horn). When built, the arch sank by 2 in (5.1 cm) when its timber centering was removed, and another 8 in (20 cm) due to settlement of the arch foundations . Today it is a pedestrian-only bridge, and is in the guardianship of Historic England as a scheduled ancient monument . Road traffic on the A40 crosses the Severn on a new bridge alongside and upstream of it. This
18-444: A significant factor in finding the strength and size of a beam as it determines the maximum bending moment and deflection . The maximum bending moment M m a x {\displaystyle M_{max}} and deflection δ m a x {\displaystyle \delta _{max}} in the pictured beam is found using: where The maximum bending moment and deflection occur midway between
24-753: Is the last road bridge over the Severn before the Severn Crossings , and was the most downstream free crossing until tolls were removed from the Severn Bridge and Second Severn Crossing in December 2018, although the Severn Bridge already had free access for pedestrians, cyclists and mopeds and, as previously stated, there is no vehicular access to Over Bridge. The bridge is connected by segregated bicycle paths around Alney Island, to Highnam and Gloucester. The Over Bridge can be seen from
30-469: The Severn Bridge was built in the 1960s, this was the lowest point downstream that the Severn could be crossed by road bridge. The arch spans 150 ft (46 m), and was based on Jean-Rodolphe Perronet 's 1774 design for a bridge over the River Seine at Neuilly . It combines both an elliptical profile over most of the soffit with a segmental profile at its faces. This feature is known as
36-457: The train travelling from Gloucester on the way to Lydney or Chepstow on the Gloucester to Newport section of the former South Wales Railway . Span (architecture) A span can be closed by a solid beam or by a rope. The first kind is used for bridges, the second one for power lines , overhead telecommunication lines, some type of antennas or for aerial tramways . Span is
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