Research on the Determination and Optimization of Cable Forces for Large-Span Cable-Stayed Cantilever Casting Arch Bridges
The optimization of cable tension in large-span cantilever casting reinforced concrete arch bridges is crucial for the quality of the completed bridge.This article relies on the cantilever pouring construction project of a reinforced concrete arch bridge with a main span of 200 m in the plateau canyon area.A three-dimensional numerical model is established through finite element software,and a set of cable tension is obtained using the minimum bending energy method.Further based on the influence matrix method,the unknown load coefficient function in finite element software is used to optimize the cable force of the buckle,and the cable force distribution,arch bending moment,stress and other indicators before and after optimization are compared.Research has shown that the variation law of cable force determined by the minimum bending energy method:as the length of the cable increases,the overall trend of cable force increases,and the closer it is to the arch,the greater the amplitude of cable force change.The distribution characteristics of cable forces optimized by finite element software are basically the same as before optimization,but the increase in cable forces after optimization is significant,and the safety margin is greater,especially near the arch top.The optimized cable force combination effectively reduces the bending moment and upper and lower edge stress of the arch ring,and significantly improves the overall stress distribution of the arch bridge.This study can provide some reference for similar projects.
cantilever casting arch bridgeminimum bending energy methodunknown load factorcable force optimization
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