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2025-02-04 08:38 本頁面
【文章內(nèi)容簡介】 dge was erected over the Xinyi River along the Longhai Railway line. Completed at the same time, the first . highway bridge was the Jingzhou Highway Bridge. The longest simplysupported . beam which reaches 62m belongs to the Feiyun River Bridge in Ruan39。an, Zhejiang Province, built in 1988. Another example is the Yellow River Bridge, built in the city of Kaifeng, Henan Province in 1989. 77 of its spans are 50m simplysupported . beams and its continuous deck extends to 450m. It is also noticeable that the bridge is designed on the basis of partially prestressed concrete theory. Elastic analysis and beam theory are usually used in the design of segmental box girder structures. For box girders of unusual proportion, other methods of analysis which consider shear lag should be used to determine the portion of the cross section effective in resisting longitudinal bending. Possible reserve shearing stress in the shear keys should be investigated, particularly in segments near a pier. At time of erection, the shear stress carried by the key should not exceed fc3 . The prestressed concrete rigid Tframe bridge was primarily developed and built in China in the sixties. This kind of structure is most suitable to be erected by balanced cantilever construction process, either by cantilever segmental concreting with suspended formwork, or by cantilever erection with segments of precast concrete. The first example of cantilever erection is the Wei River Bridge (pleted in 1964) in Wuling, Henan Province, while the Liujiang Bridge (pleted in 1967) in Liuzhou in Guangxi Zhuangzu Autonomous Region is the first by cantilever casting. Nevertheless, the Yangtze River Bridge at Chongqing (pleted in 1980), having a main span of 174m, is regarded as the largest of this kind at present. On the basis of the design and construction of . rigid Tframe bridges, was developed multi . continuous beam and continuous rigid frame bridges, which can have longer spans and offer better traffic conditions. Among the others, the Luoxi Bridge in Guangzhou, Guangdong Province (pleted in 1988) features a 180m main span. And the Huangshi Bridge crossing the Yangtze River in Hubei Province, which is still under construction, has a span of 245 meters. The representive of . continuous girder railway bridge, the second bridge over the Qiantang River (finished in 1991), boasts its large span and its great length, its main span being 80m long and continuity over 18 spans. Its erection is an arduous task as the structure was subjected to a wave height of and a tidal pressure of 32kPa when under construction. The extensive construction of continuous beam bridges has led to the application of incremental launching method especially to straight and plane curv
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