(重庆市设计院， 重庆 400015)

［摘要］近年来，基于性能的结构抗震设计方法得到了广泛关注和研究，我国也有相应的规范条文。但是常规设计方法仅考虑了多遇地震作用，得到的设计结果往往不能无法满足设防、罕遇地震下构件性能水准要求。而设防、罕遇地震弹性、不屈服设计方法得到的设计结果又存在经济性不佳或者构件严重超筋等情况。故现有的常规设计方法在抗震性能设计领域有所欠缺。本文认为，当所有构件都处于性能水准允许的极限状态，结构就处于性能水准允许的最低刚度状态。即性能水准对应了构件的允许最低刚度，在这个前提下本文提出了利用折减构件刚度进行设防、罕遇地震作用计算的近似设计方法，相对于现有常规设计方法更容易满足性能水准要求，且具有较好的经济性。最后通过一个典型算例进行验证。

［关键词］性能设计；  性能水准； 抗震； 刚度折减

中图分类号： TU318 文献标识码： A文章编号：  1002-848X(2016)S1-0359-04

Performance-based seismic design method of structure based on components′ stiffness

 reduction according to seismic performance levelsBao Haoshan

(Chongqing Architectural Design Institute， Chongqing 400015, China)

Abstract:  In recent years, Performance-based seismic design of structure has gained wild attention and research. It has also been introduced in Chinese code for seismic design of buildings. But the conventional seismic design result can not always satisfy the seismic performance objectives of structure in service level and maximum considered earthquake, and the elastic design and un-yield design result will greatly increase the cost. So we have some defects in recent performance-based seismic design of structure methods. The components have allowable lowest stiffness according to seismic performance levels of structure. The stiffness of components to design the structure in service level and maximum considered earthquake can be reduced. Comparing to the recent methods, it is more efficient and brings more economical benefits.

Keywords:  performance-based seismic design; seismic performance level; seismic; stiffness reduction

作者简介：包浩杉，硕士，一级注册结构工程师，Email：baohaoshan@126.com。