【摘要】 近断层长周期地震动是一类较特殊的破坏性地震动,对长周期结构的破坏尤为显著。为深入分析近断层地震动的工程特性,基于小波分析中的多尺度分析方法对近期12次典型破坏性地震的53条近断层地震动进行了分解,得到266条地震动分量。通过研究地震动分量的幅值、周期和双规准谱的特征,提出了一种评估近断层区建筑结构地震反应的方法。这种方法能够给出单自由度弹性体系在周期为0.3~20s地震动分量作用下的最大绝对加速度反应,并综合考虑了场地和断层距的影响,给出了简洁的函数表达式,为近断层区建筑结构尤其是长周期结构的设计提供了参考依据。更多还原

【Abstract】 The near-fault ground motion with long period is one special kind of destructive ground motions and has significant damage to long period structures particularly.For further research on the effects of near-fault ground motion to structures,53 typical near-fault ground motions that selected from 12 recent major earthquakes were decomposed based on multi-scale analysis method in wavelet theory,and a total of 266 ground motion components were obtained.A method to estimate seismic response of buildings that constructed in near-fault region was proposed by research on the characteristics of ground motion components,including amplitude,period and bi-normalized response spectra.This method is able to give the maximum absolute acceleration response of single degree freedom elastic system under the effect of ground motion components with period range from 0.3sto20 s.The impact of site and rupture distance was considered,and a simple function was given.This method can provide detailed reference for the design of near-fault region structures,especially for long period structures.更多还原