新抗震规范反应谱的适用性研究

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。

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

Applicability of response spectra was investigated based on study of damping reduction factors and pseudo relative displacement spectra of ‘Code for seismic design of buildings' (GB 50011). On the basis of damping mechanism, it is found that except for reducing relative displacement spectra value effectively, the higher damping ratio may also amplify the absolute acceleration spectra value of building structures, rather than attenuate it all the time. In this case, comparison of seismic influence coefficient curves, damping reduction factors and pseudo relative displacement spectra varying from different site classes and damping ratios between Code (GB 50011-2010) and Code (GB 50011-2001) were performed. Besides, problems 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 were pointed out.