近断层地震动运动特征对组合隔震体系减震性能的影响

Influence of Motion Characteristics of Near-fault Ground Motions on Combined Isolation System Damping Performance

输入近断层地震记录,考察了破裂向前方向性和滑冲效应脉冲对组合隔震体系减震性能的影响.研究表明,滑冲效应脉冲比破裂向前方向性脉冲对组合隔震结构更具有破坏性,在破裂向前方向性脉冲地震作用下,LRB隔震体系的隔震效果比组合隔震体系的效果稍好.在滑冲效应脉冲地震作用下,采用组合隔震体系可有效减小隔震层的位移幅值,但隔震结构的顶层加速度峰值和基底剪力略有增大.

Inputting near-fault seismic records, the effect of rupture forward directivity and fling-step pulse on damping performance of combined isolation system is investigated. Research indicates that the fling-step pulse is more destructive than the rupture forward directivity pulse for combined isolation system. The isolation effect of LRB isolation system is slightly better than the combined isolation system under the rupture forward directivity pulse earthquake. The combined isolation system can reduce effectively the displacement amplitude of isolation layer un- der the fling-step effect earthquake, but the peak acceleration on the top and the base shear of the isolated structure increase slightly.