弹塑性SDOF系统累积滞回耗能谱  

Cumulative Hysteretic Energy Spectra of SDOF Systems

作　　者：程光煜[1] 叶列平[1] 

机构地区：[1]清华大学土木工程系

出　　处：《工程抗震与加固改造》2007年第2期1-7,共7页Earthquake Resistant Engineering and Retrofitting

摘　　要：本文对弹塑性SDOF系统累积滞回耗能谱进行了分析研究。以4种场地土条件下40条强震记录为输入,分析了结构和地面运动参数对弹塑性SDOF系统累积滞回耗能谱与输入能量谱比值的影响。结果表明:阻尼比、延性系数、初始周期有很大的影响,而地面运动参数影响不大。结合现有的10种累积滞回耗能谱的计算模型和影响参数分析,建议了一个新的累积滞回耗能谱的计算方法。计算结果表明,本文建议的方法较好地反映了累积滞回耗能谱的影响参数和变化趋势,与现有计算模型有较好的一致性,且满足边界条件、便于计算。The cumulative hysterefic energy spectra of inelastic single degree of freedom （SDOF） systems is investigated. The ratio of cumulative hysterefic energy EH to input energy EI （EH/EI ）of inelastic SDOF systems with various damp factors and ductility ratios subjected to a world-wide ensemble of 40 earthquake records is studied with time history analysis method. The results indicate that the EH/EI ratio is mainly influenced by damp factor, ductihty ratio, initial period of the system, while the characteristics of excitation exert minor effects. By summarizing the analysis results and ten existing methods in the literatures, a new method to evaluate the EH/EI ratio is proposed. The proposed expression characterizes the EH/EI ratio fairly well. Numerical results for real ground motions having very different characteristics show that the method gives a reasonable prediction of the EH/EI ratio and is simple to be determined.

关 键 词：SDOF系统 累积滞回耗能谱 地震输入能量谱 延性系数 

分 类 号：TU313[建筑科学—结构工程]