【摘要】 非弹性位移比谱是估计工程结构非弹性位移一种简单而有效的方法。以大量的地震动记录为基础,研究近场脉冲型地震动位移比谱的特征,同时考察场地条件、峰值地面速度与峰值地面加速度比(PGV/PGA)、峰值地面速度(PGV)和最大增量速度(MIV)对近场地震动位移比谱的影响。结果表明近场地震动的脉冲作用在0.2～1.5s的周期段对位移比谱的影响最大,在此周期段,位移比谱增大了近20%左右;在其他周期段,近场地震动的脉冲作用对位移比谱的影响不明显。通过研究不同地震动参数对近场位移比谱的影响发现,峰值地面速度与峰值地面加速度比(PGV/PGA)是影响近场地震动位移比谱最大的参数,场地条件对近场地震动位移比谱的影响不大。更多还原

【Abstract】 The displacement ratio spectra method is a simple and effective way to evaluate the maximum inelastic displacements of structures.The characteristics of displacement ratio spectra for near-field ground motions are investigated based on a great number of earthquake ground motions.The effects of site condition,ratio of peak ground velocity to peak ground acceleration(PGV/PGA),peak ground velocity(PGV)and maximum incremental velocity(MIV)on displacement ratio spectra are also evaluated.It is concluded that the effect of near-field ground motions on displacement ratio spectra is significant at periods between 0.2~1.5 s,where the amplifications can approach 20%.However,the effect is not obvious in other period ranges.PGV/PGA can provide the largest influence on displacement ratio spectra for near-field ground motions.It is also found that site condition has small effect on inelastic displacement ratio spectra for near-field ground motions.更多还原