【摘要】 在基于性能的地震工程学(PBEE)中,概率地震需求模型(PSDM)是一个重要部分,它需要对地震需求参数(EDP)进行概率估计。强地面运动的变异性对EDP的概率估计影响最大,作为强地面运动三要素之一的持时对结构破坏的影响已引起广泛关注。为了将持时与幅值、频谱的影响进行解耦,采用实际地震波和匹配同一反应谱的人工波,并进行合理的调值,对一座钢筋混凝土桥墩分别进行非线性动力时程分析。对比强地面运动持时和不同需求参数的相关性表明:持时对位移需求参数和延性需求参数影响甚微,但对表征能量的需求参数和累积破坏参数影响显著。同时,说明在选择结构第一模态周期谱加速度和合理的能量需求参数分别作为地面运动强度参数(IM)和EDP建立PSDM时,如何考虑持时的影响。更多还原

【Abstract】 The influence of the duration of earthquake strong-motions on structural damage has aroused a broad at- tention of many researchers.In the process of nonlinear dynamic time history analysis on RC column by using real acceler- ograms and spectral matched artificial accelerograms with reasonable sealing,the influence of duration and that of ampli- tude or spectral characteristics on structural damage can be seperated.Comparison of the correlations between the duration of the ground motion and various demand measures reveals that the duration has no influence on demand measures using displacement and ductility,but is correlated to energy demand measures and cumulated damage measures.In establishing the probabilistic seismic demand model(PSDM),when the period spectral acceleration of the first mode and the reasona- ble energetic demand measures are adopted as the intensity measure (IM) and the engineering demand parameters(EDP) respectively,how to consider the influence of duration is important and expounded in the paper.更多还原