斜拉桥的发展趋势是跨径超大化、结构轻型化，使其结构受力性能更为复杂，其受力性能的进一步优化显得尤为重要。以混凝土梁预应力理论为基础，选择六冲河主跨438 m大跨径双塔斜拉桥作为研究对象，对斜拉桥中最典型的大跨径双塔斜拉桥的预应力后期束配置进行优化研究，运用大型有限元计算软件Midas Civil对不同预应力度下的结构进行计算，分析其受力性能，使其在结构受力性能和经济性上更为合理，为混凝土斜拉桥预应力设计提供一定的参考。%At present,the cable-stayed bridges exhibit a development tendency of super-large span and lighter structure,enabling mechanical performance of structures to be more complicated,therefore,further optimization of mechanical performance shows particular importance. On the basis of the theory of prestressed concrete beams,this paper selects Liuchong River Large-span Double-tower Cable-stayed Bridge at a main span of 438m as the object of research to conduct optimization research on configuration of prestressed late tendons of the most typical large-span double -tower cable -stayed bridges in cable -stayed bridges,and calculates structures under different degrees of prestress by means of large-scale finite element computational software Midas Civil and analyzes its mechanical performance with the purposes of realizing more reasonable mechanical performance of structures and economy so as to provide a certain reference for prestress design of concrete cable-stayed bridges.
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