新抗震规范反应谱的适用性研究  

Study on applicability of response spectra stipulated in Chinese Code(GB 50011-2010)

作　　者：曹加良[1] 施卫星[1] 何文福[2] 汪洋[3] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092 [2]上海大学土木工程系,上海200072 [3]上海电力学院,上海200090

出　　处：《振动与冲击》2011年第11期79-84,共6页Journal of Vibration and Shock

基　　金：国家重点基础研究发展计划973项目(2007CB714202)

摘　　要：对《建筑抗震设计规范》(GB 50011)反应谱的阻尼比折减系数、拟相对位移谱等进行研究以说明我国抗震规范反应谱的适用性。基于阻尼减震机理,指出较大的阻尼比除能有效地衰减结构相对位移谱值外,并不能始终如一地衰减反而会放大结构绝对加速度谱值;比较了新旧抗震规范给出的对应于各类场地条件、不同阻尼比的地震影响系数曲线的变化规律、阻尼比折减系数及拟相对位移谱;指出在利用人工地震波对长周期、大阻尼比减隔震结构进行时程分析时需注意的问题。The applicability of seismic response spectra stipulated in ＇Code for seismic design of buildings＇（GB 50011） was investigated based on the study of their damping reduction factors and pseudo relative displacement spectra.On the basis of damping mechanism inspection,it is found that besides reducing the magnitudes of relative displacement spectra effectively,the higher damping ratio may also amplify the magnitudes of absolute acceleration spectra of building structures,rather than attenuate them all the time.In this case,comparisons of seismic influencial coefficient curves,damping reduction factors and pseudo relative displacement spectra varying with different site classes and damping ratios between Code（GB 50011-2010） and Code（GB 50011-2001） were performed.Besides,problems were pointed out,which should be noticed during the process of generating artificial seismic wave as input of time-history analysis of long-period structures with high damping ratio,such as seismic-isolation structures or seismic-energy-dissipating structures.

关 键 词：反应谱 位移谱 阻尼比折减系数 建筑抗震设计规范 人工地震波 时程分析 

分 类 号：TU311.3[建筑科学—结构工程] TU352.1