钢框架结构基于整体优化策略的非线性抗震设计

针对现有抗震优化设计很少考虑结构非线性反应的缺点,提出了整体优化策略,并运用到钢框架结构造价最小的抗震优化设计中。以结构构件截面尺寸为设计变量,结构构件的总体积为目标函数,整体优化策略在以结构弹性强度和弹性变形为约束条件的基础上,增加弹塑性变形为约束条件,与我国抗震设计规范两阶段设计方法相对应,因此基于整体优化策略的优化设计结果可以作为最终的结构设计方案。整体优化策略不仅能够考虑结构的非线性反应,而且可以采用我国抗震规范的相关规定作为约束条件,适用于钢框架结构造价最小的抗震优化设计。

Overall optimization strategy for nonlinear seismic design of steel frame structures

The structural nonlinear responses aren’t considered in all most optimum seismic design of structures,the overall optimization strategy is bring forward in this paper,which is used to optimum seismic design of minimum cost of steel frame structure.The cross section dimensions of structural components are used as design variables and total volume of structural components is acted as objective function.Besides the restrictions of structural elastic strength and elastic deformation,the structural elastoplastic deformation restriction is adopted in overall optimization strategy,corresponding to the two phases seismic design method in Chinese seismic design code,so the results of overall optimum seismic design can be ascertained to the final design project of structures.So not only structural nonlinear responses are taken into account,but also the constraint conditions can be found in Chinese seismic design code,which is adapted to optimum seismic design of minimum cost of steel frame.