近场脉冲型地震动对钢筋混凝土框架结构影响

目的研究钢筋混凝土框架结构在近场脉冲型地震动作用下的反应特性，给出可用于近场环境估计结构破坏程度的地震动参数．方法从弹性反应谱、结构顶点位移、层问位移比和基底剪力四个方面，与远场地震动作用下结构的反应进行对比．采用计算地震动参数和结构整体破坏指数相关性的方法研究地震动参数用于结构破坏估计的适用性．结果近场脉冲型地震动和远场地震动有着明显的不同，在前者作用下结构的反应明显增大．得到了各参数与结构破坏程度的相关性。结论近场脉冲型地震动中含有较丰富的低频分量，谱值随周期增大衰减较慢．在近场环境峰值地面速度（PGV）和地震动能量密度（Eρ）可用来较好地估计结构的破坏程度．

Effects of Near-field Pulse-like Ground Motions on Reinforced Concrete Frame Structures

This paper presents the results of research on response characteristics of reinforced concrete frame structures subjected to near-field pulse-like ground motions,and on the appropriate seismic ground motion parameters which can be used in damage estimations.The behaviors of reinforced concrete frame structures subjected to near-field pulse-like and far-field ground motions are compared.Four main aspects are included in the comparisons:elastic response spectra,roof displacement,story drift ratio and base shear.The comparisons show that there are many differences between near-field pulse-like and far-field ground motions,and the near-field ground motions result in much more demand.A mild decline due to abundant low frequencies is found in the responsive spectra for near-field pulse-like ground motions.It is recommended that the peak ground velocity(PGV) and ground energy density(E() are the parameters that can be used to estimate the damage degree of structures in the near-field environment.