在用RC框架结构基于位移的抗震性能评估

Displacement-based Seismic Behavior Evaluation for Existing RC Frame Structures

根据能力谱方法的基本原理 ,建立了在用RC框架结构基于位移抗震性能的评估方法。该方法采用了振型分解法建立的多自由度体系和等效单自由度体系之间的转换关系 ,以及由现行《建筑抗震设计规范》的反应谱曲线建立的结构抗震要求曲线。用本文方法对清华大学主楼 1 0层钢筋混凝土框架结构进行了抗震性能评估 ,同时进行了小震和大震作用下的弹塑性时程分析。本文方法得到的顶点位移角。

By means of basic principle of capacity spectrum method,the displacement based seismic capacity evaluation method for existing reinforced concrete(RC) frame structures is established. Basic features of the method are non linear static analysis (i.e., push over analysis),transformation between multi degree of freedom system (MDOF) and single degree of freedom system(SDOF), and seismic demand curve in the form of acceleration displacement spectrum. The relationship between MDOF and SDOF is established by mode analysis and the seismic demand curve according to the response spectrum given in the current Seismic Design Code for Buildings. Seismic performance of 10 story main building of Tsinghua University is evaluated by the developed capacity spectrum method. The results, such as the top displacement, the story drift and the plastic hinge distribution under the minor earthquake and the rare earthquake are verified by non linear time history analysis.