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为了解决桥梁结构整体承载力设计与优化的难题,基于弹性模量缩减法提出了桥梁结构构件和整体两层面安全性设计及其优化策略。首先研究分析了桥梁结构在构件和整体2个层面上的安全系数取值,然后利用齐次广义屈服函数建立单元承载比,提出了高、低承载构件的动态判别准则。通过有策略地调整构件截面强度,建立了桥梁结构两层面承载力设计方法;进而以结构两层面承载安全性要求为约束条件,以均匀承载为优化准则,提出了桥梁结构优化设计方法。结果表明:所提出的方法能够避免将第2类高承载构件误判为低承载构件,可获得两层面承载安全性能和经济性能均优的桥梁结构设计方案。
In order to solve the problem of design and optimization of overall bearing capacity of bridge structure, the safety design and optimization strategy of bridge structural member and overall two-level surface are proposed based on the elastic modulus reduction method. Firstly, the value of safety factor of the bridge structure on the two components of the component and the whole is analyzed. Then, the unit bearing ratio of the component is established by using the homogeneous generalized yield function, and the dynamic discriminant criterion of high and low load-bearing components is proposed. By strategically adjusting the cross-section strength of the members, the design method of bearing capacity of the two-level structure of the bridge structure is established. Based on the requirement of bearing safety of two levels of the structure as the constraint condition and the uniform load as the optimization criterion, an optimal design method of the bridge structure is proposed. The results show that the proposed method can avoid the misjudgment of the second type of high load-bearing members as low load-bearing members and obtain the bridge structure design with excellent safety performance and economic performance on both sides.