RC框架结构直接基于位移的抗震优化设计方法

探讨了静力弹塑性分析验证过程中遇到的几种情况及其产生原因,指出建筑结构设计方案在基于位移的抗震设计中的重要性。从框架结构的侧移模式出发,导出结构一定性能水平的目标顶点位移,建立结构目标顶点位移与等效位移的关系式,根据位移反应谱,由等效位移推出框架结构在各性能水平的目标周期。然后,由pushover曲线确定结构刚度退化机理,导出结构各性能水平相应的自振周期比例关系,根据结构各性能水平自振周期与目标周期的关系确定结构最优设计方案。通过例题加以验证,说明了此设计方法的可行性。

Optimal method for direct displacement-based seismic design of RC frames

Some problems in pushover analysis are discussed.It illustrates that the structural scheme is very important in direct displacement-based seismic design.The roof's target displacement of RC frames is deduced by its lateral displacement mode.The relationship between the roof's target displacement and the equivalent displacement is determined.Based on displacement response spectra,the equivalent period for each performance could be deduced by equivalent displacement.Then,the degradation of structural stiffness is presented by pushover curve,and the relationship among natural periods of each performance is determined.According to the relationship between natural periods and corresponding equivalent period,the optimal structural scheme is chosen.The paper illustrates the application of the proposed method with an example and it proves that this method is feasible.