某框架结构的抗震性能评估  

Seismic performance assessment on some frame structure

作　　者：吴巧云[1,2] 朱宏平[1,2] 樊剑[1,2] 曾志和[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,武汉430074 [2]华中科技大学控制结构湖北省重点实验室,武汉430074

出　　处：《振动与冲击》2012年第15期158-164,共7页Journal of Vibration and Shock

基　　金：国家杰出青年科学基金资助项目(50925828);国家自然科学基金资助项目(50778077)

摘　　要：以一个8层钢筋混凝土框架结构为研究对象,首先对其进行结构设计,得出各梁、柱截面尺寸及配筋布置;然后采用OpenSees程序对其中一榀框架建立二维模型,选择20条含明显速度脉冲的近场地震记录对该框架结构进行增量动力分析(IDA),同时选择20条典型远场地震记录以作对比分析。基于IDA分析的结果,从概率的角度对结构进行地震性能评估,得出结构在不同IM(Intensity Measure)参数及近场、远场地震作用下的超越概率、地震危险性曲线及年平均超越概率。通过对比分析发现,IM参数的选择对结构地震性能评估有很大影响。近场地震由于其较高的速度脉冲,使得结构的超越概率、平均超越频率及年平均超越概率均大于远场地震。An 8-storey reinforced concrete frame structure was taken as an investigated subject.The section sizes and the reinforcement layout of beams and columns were designed.A two-dimensional model of the structure was established using OpenSees program.An incremental dynamic analysis was carried out taking 20 near-field ground motion records,which contain notable obvious speed pulses,as seismic input.Meanwhile,20 typical far-field ground motion records were chosen either to accomplish a comparative analysis.Based on the incremental dynamic analysis,seismic performance assessment on the structure was achieved in the perspective of probability.The exceeding probability,seismic hazard curves and mean annual exceeding probability in the cases of different IM parameters and different（near-field and far-field） ground motions were obtained.Comparisons show that the choosing of IM parameters has great influence on the seismic performance assessment.Due to the existence of high velocity pulse,the near-field ground motions make the exceeding probability,mean exceeding frequency and mean annual exceeding probability of the structure all greater than far-field ground motions.

关 键 词：近场地震 增量动力分析 地震性能评估 超越概率 年平均超越概率 

分 类 号：TU375[建筑科学—结构工程] TU311.3