考虑土-结构相互作用的隔震结构楼层反应谱分析

非结构构件常在大震甚至中小地震中发生损坏或中断工作,造成巨大损失。目前主要是通过建立楼层反应谱来考虑非结构构件的安全和运作。通过模态分析对隔震体系进行解耦,并考虑与地基土相互作用的条件下,推导出非结构构件的运动方程,从而建立楼层反应谱,并对不同性质的地基土、隔震装置和非结构构件中不同阻尼比对楼层响应的影响进行分析。结果表明,增加隔震装置并不一定能减小非结构构件的地震响应,对阻尼比较小且周期较长的非结构构件来说反而是不利的。

Floor Response Spectra Analysis of Base-isolated Structure Considering Soil-structure Interaction

Non-structure components (NSCs) were damaged or interrupted operation under strong earthquake even medium-small earthquake, which caused great economic lost. Generating floor response spectra is the practical method to examine the seismic safety and normal operation of NSCs. Mode analysis is carried out for decoupling the base-isolated system, then the NSCs motion equation by considering the soil-structure interaction is derived and the floor response spectra is also generated. Moreover, the effect of soil characteristic, base-isolated device and different damping ratio of NSCs are further studied. Results show that the use of base-isolated device does not necessary decrease the seismic response of NSCs; oppositely, it's harmful for NSCs while the damping is relatively low and the period is relatively long.