考虑动力特性约束的斜拉桥优化设计新方法

A New Method for Optimized Design of Cable-Stayed Bridge with Consideration of Dynamic Characteristic Constraint

文章通过运用一阶优化计算方法并引入灵敏度分析,提出了带频率约束条件的斜拉桥优化设计方法,并以通用有限元软件ANSYS为平台,编制了相应的程序,实现了斜拉桥结构在频率、应力、变形等约束条件下的设计优化。通过舟山金塘门大桥工程实际算例,证明该方法适合工程应用。

Dynamic characteristic is a very important index in the design of cable-stayed bridges. Most of the current optimized methods haven't taken dynamic characteristic (such as inherent frequency etc) into consideration as the constraint condition in optimization. Based on the application of first-order optimized calculation and sensitive analysis, an optimized design method with frequency constraint for cable-stayed bridge is proposed in the paper, and a relevant program has been made with general finite element software ANASYS as the base platform, to realize the design optimization of cable-stayed bridge structure under the constraint conditions of frequency, stress, deformation etc. The calculations for actual projects show that the method is applicable in projects.