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The Garden Bridge project was an unsuccessful private proposal for a pedestrian bridge over the River Thames in London, England. [1] Originally an idea of Joanna Lumley, [2] and strongly supported by then-Mayor of London Boris Johnson, [3] the designer Thomas Heatherwick worked with Arup Group on a proposal by Transport for London (TfL) for a new bridge across the Thames between Waterloo ...
In 1875, the first iron-reinforced concrete bridge ever built was constructed at the Castle of Chazelet. Monier was the designer. The important point of Monier's idea was that it combined steel and concrete in such a way that the best qualities of each material were brought into play. Concrete is easily procured and shaped.
In 1991, the Wusong Floodgate Bridge, a new concrete road bridge was constructed to the west of Waibaidu Bridge, and the river crossing traffic was mainly diverted onto the new bridge. After the completion of the Bund reconfiguration project, the Wusong Floodgate Bridge will be rendered obsolete by a new tunnel and will be demolished.
Box girder bridges, made from steel, concrete, or both, are also beam bridges. Beam bridge spans rarely exceed 250 feet (76 m) long, as the flexural stresses increase proportionally to the square of the length (and deflection increases proportionally to the 4th power of the length). [28]
The longest steel reinforced bridge, in 2024, is the 600 metres (2,000 ft) Tian'e Longtan Bridge, Guangxi Zhuang, China. [8] The US's longest unreinforced concrete span, is the 200 feet (61 m) arch of the, 1910, Rocky River Bridge in Cleveland, Ohio. [9] Early extant examples include:
By doubling the size of the arch, Paul Séjourné paved the way for the construction of large reinforced concrete arch bridges. The arrival of new construction techniques using steel, such as suspension bridges, prestressed concrete bridges, or cable-stayed bridges, abruptly marked the end of masonry bridge construction in the Western world.