高位隔震连体结构地震反应分析

以高层大跨钢连廊式连体结构为研究对象,采用时程分析法计算当塔楼与连接体之间在高位分别采用铰接、隔震支座连接时连接体与塔楼的地震响应,并进行对比分析;同时,通过FFT变换,进一步对隔震结构减震效果在频域内进行分析.结果表明:当连体结构塔楼固有频率与隔震装置的固有频率比大于1.4时,连接体就开始产生隔震效果,且随着频率比的增大,隔震效果越好;输入地震波的频谱成分对隔震效果也有一定的影响,但并不影响隔震效果与频率比之间的变化关系.当连廊质量近似等于塔楼单层质量时,采用隔震支座连接时的塔楼加速度,位移及基底剪力与铰接时基本一致.

Seismic Response Analysis of High-position Isolation Connecting Buildings

In this paper,the dynamic response of high-position isolation connecting buildings is studied.By time history analysis,the seismic response and deformation properties of the tower and connected structures are analyzed,with or without isolation.Meanwhile,through Fast Fourier Transform,the corresponding power spectrum density is derived.The analysis results show that seismic isolator can mitigate the seismic response of connected structures when the frequency ratios of single-tower and isolation mechanism are larger than 1.4,and site characteristic period can also affect the isolation efficiency.Compared with the pin-joint,the connecting isolation has little effect on displacement,velocity,acceleration and basement shear of towers when the mass of connected structure is equal to single floor mass of tower.