竖向不规则钢筋混凝土框架结构基于性能的抗震评估方法

New method for performance based seismic evaluation of vertically irregular reinforced concrete frame structures

考虑结构在地震作用下不同反应阶段的动力特性,根据结构的振型分析,采用振型反应谱法,建立了结构在不同地震作用水平下的弹塑性需求曲线族,即结构的层间剪力-层间位移需求曲线,结合结构的能力曲线,提出了以楼层为研究对象的层间能力谱法。通过对一个竖向不规则框架结构的抗震性能进行评估,对层间能力谱法的使用方法和应用原理进行了详细的阐述,并与能力谱法果进行了对比,结果表明层间能力谱法可以有效的判别出结构的薄弱层、识别结构各楼层在地震作用下所处的受力状态。

Considering the dynamical characteristics of structures under different earthquake hazard level,inelastic demand curves,namely,the curve of inter-story shear versus inter-story displacement were established by using mode spectrum method.Taking into account the capacity curves of structures,a new method named inter-story capacity spectrum was put forward for the performance based seismic evaluation of vertically irregular frame structures.An example was presented to explain how to make use of the method and to demonstrate its applicability and utility.It is concluded that the new method can availably identify the soft story of the structure and estimate the displacements of stories under different earthquake hazard action.By comparing the corresponding results,the method proposed is superior to the capacity spectrum method.