近断层地震作用下设备-结构耦合隔震体系动力响应分析

Dynamic response analysis of an equipment-structure coupling isolation system under near-fault ground motions

建立设备-结构耦合隔震体系模型,选取近断层脉冲型和非脉冲型地震波各50条,计算耦合隔震体系的动力响应。分析表明,近断层脉冲型地震动对耦合隔震体系的影响大于非脉冲型地震动,且对主体结构的影响大于对设备的影响;近断层脉冲型地震作用下的隔震层位移、层间位移、楼层加速度、设备加速度和设备位移的平均响应分别达到非脉冲型地震作用的2.25倍、2.17倍、2.24倍、1.17倍和1.20倍。进行设备-结构耦合隔震体系设计时,需考虑近断层地震动脉冲作用的影响,同时需注意引起主体结构和设备最大响应的地震动不一定相同。

A model of equipment-structure coupling isolation system was first established in this paper, then fifty near-fault pulse-like and fifty near-fault non-pulse-like seismic waves were selected to determine the dynamic responses of the isolation system. The analysis results show that the effect of near-fault pulse-like ground motions on the coupling isolation system is greater than that of near-fault non-pulse-like ground motions, and the effect on the main structure is greater than that on equipment. Average responses of the displacement of isolation layer, story drift, floor acceleration, equipment acceleration, and equipment displacement under near-fault pulse-like ground motions are 2.25 times, 2.17 times, 2.24 times, 1.17 times, and 1.20 times of those under near-fault non-pulse-like ground motions, respectively. In the design of the equipment-structure coupling isolation system, the impact of pulse characteristics of near-fault ground motions should be considered. Meanwhile, it should be noted that ground motions causing the maximum response of the main structure and equipment may not be the same.