地震波参数对柱顶隔震体系的水平向减震性能影响研究

为了研究地震波参数对柱顶隔震体系的水平向减震性能的影响，选取台湾集集地震中8条地震波作为输入，进行了柱顶隔震体系模型的振动台试验。分析了柱顶隔震体系的水平向动力响应特点，研究了地震波的PGV/PGA、卓越周期、平均周期和断层距及幅值对其水平向减震性能的影响，并进行了数值模拟的对比分析。结果表明:柱顶隔震体系的水平向减震性能良好。相同地震强度下地震波参数的PGV/PGA、卓越周期、平均周期和断层距对柱顶隔震体系水平向减震性能的影响明显，其中:PGV/PGA的影响程度最大，可以作为主要的分析指标；随着地震动强度的增大柱顶隔震体系的水平向减震效果更加明显，地震动强度达到一定幅值后，减震率缓慢下降；与远场地震相比，近场地震不利于柱顶隔震体系的水平向减震性能的发挥，脉冲型近场地震作用下其减震效果更差。振动台试验结果与数值模拟结果基本一致，表明分析结果的可靠性。

Study on influence of seismic wave parameters on horizontal seismic mitigation performance of column top isolation system

In order to study the horizontal seismic mitigation performance of column top isolation system (CTIS) under the ground motion, eight earthquake waves were selected from the Chichi earthquakes as input. And test models were done the shaking table test. The dynamic responses of CTIS were analyzed. The influence of parameters of earthquake waves on horizontal seismic mitigation performance of CTIS were researched, which include the PGV/PGA and predominate period and mean period and rupture distance and its amplitude. Then the test results of CTIS were compared with that of numerical analysis. The results show that the horizontal seismic mitigation performance of CTIS is better. Under the same earthquake intensity condition, the PGV/PGA and predominate period and mean period and rupture distance of earthquake waves have great influence on the horizontal seismic reduced effect of CTIS, and the effect of PGV/PGA is most obvious and it can be as the main analysis index. The horizontal seismic reduced effect of CTIS increases rapidly with the increasing of ground motion intensity, after the certain ground motion intensity, the horizontal seismic reduced effect of CTIS decreased slowly. Compared with far-fault ground motion, it is the adverse effect of near-fault ground motion on the horizontal seismic performance of CTIS, and the horizontal seismic reduced effect of CTIS gets worse under the near-fault pulse-like ground motion. The experimental results are basically consistent with those of the numerical analysis to indicate the analysis results are reliable.