中震弹性设计与中震不屈服设计的理解及实施

Interpretation and Implementation of Elastic and Non-Yielding Design under Moderate Earthquake

我国目前的抗震规范规定结构抗震设计时,进行小震作用下的承载力验算、弹性变形验算和大震作用下的弹塑性变形验算,对中震设计的具体内容涉及很少。近年来随着我国复杂和超限结构的不断出现,国内一些专家提出对此类重要结构实施中震作用下的抗震设计,具体包含"中震弹性"和"中震不屈服"两种方法。文中首先就这两种设计方法的概念、具体设计参数进行了对比分析;然后以某一高层混合结构为例,对比了按7度丙类建筑小震、乙类建筑小震、丙类建筑中震不屈服、丙类建筑中震弹性下的设计结果,得到的一系列结论可供设计人员和规范修编参考。

In Chinese code for seismic design, the structural examination will include force carrying capacity and elastic deformation check under minor earthquake, and elasto-plastic deformation check under major earthquake. There is no prohibited structural calculation for moderate earthquakes. With the rapid rush of the complex structures in recent years, however, Chinese structural experts propose to perform structural design of those buildings under moderate earthquake. Those methods are termed as ＂elastic design＂ and ＂non-yielding design＂ under moderate earthquake, respectively. First the concept and design parameter of these two methods were compared in this paper. Then the analytical results of a tall hybrid structure were analyzed under structure class B and C of minor earthquake, and under elastic and non-yielding design of moderate earthquake. The results and conclusions drawn in this paper can be referred by the structural design and code revision.