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通过对两类近断层地震动的弹性反应谱和滞回耗能谱特性进行分析,并与普通地震动的反应谱进行对比,得出两类近断层地震动对中长周期结构的加速度响应、动力响应、速度响应、位移响应以及滞回耗能的影响均比普通地震动大,且滑冲型地震动的位移响应明显比向前方向性地震动大。分别对两类近断层地震动的20个强度指标进行相关性分析,得出对于短周期结构,建议选择地面峰值加速度(PGA)作为分析用强度指标;对于中长周期结构,建议选择地面峰值速度(PGV)作为分析用强度指标。
By analyzing the elastic and hysteretic energy spectra of two types of near-fault ground motions and comparing them with the response spectrum of ordinary ground motions, we can get the acceleration responses of two kinds of near-fault ground motions to medium-long period structures, The effects of dynamic response, velocity response, displacement response and hysteresis energy dissipation are larger than those of ordinary earthquakes, and the displacement response of slips-type earthquakes is obviously larger than that of forward-direction earthquakes. The correlation analysis of 20 kinds of intensity indices of two types of near-fault ground motions respectively shows that for the short-period structure, it is suggested to choose PGA as the analysis strength index. For the medium-long periodic structure, it is suggested to choose the ground peak velocity (PGV) as the analysis intensity index.