高层隔震结构减震机理探讨

商昊江;祁皑

振动与冲击 ›› 2012, Vol. 31 ›› Issue (4) : 8-12,1.

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (4) : 8-12,1.
论文

高层隔震结构减震机理探讨

  • 商昊江; 祁皑
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Discussion on isolation mechanism of high-rise isolation structrue

  • Shang Hao-jiang; Qi Ai
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文章历史 +

摘要

从时域和频域两个角度分别研究了高层隔震结构的减震机理。采用ETABS软件建立了高层框剪隔震建筑模型和多层框架隔震建筑模型,输入单向地震波,后提取隔震层的加速度时程,将其视为地震动,输入原抗震结构中。文中对比了两者隔震前后的加速度反应谱,发现无论是高层隔震结构还是多层隔震结构都存在多振型减震的作用,但在高层结构中,高阶振型反应谱加速度的减少量相对于第一阶振型反应谱加速度的减少量要大很多,而在多层结构中,高阶振型的减少量与第一阶振型差不多,使得多振型减震在高层结构当中的效应要远大于多层结构;对比两者隔震前后基底最大剪力的减震率,发现对于高层隔震结构,叠加上高阶振型后,基底最大剪力的减震率有较大的提高,而对于多层隔震结构,减震率变化不大。从以上两个方面可以说明,多层隔震结构的高阶振型减震效应很小,且以第一振型减震为主,而高层隔震结构存在较大的高阶振型减震的效应,从而产生了其多振型减震的效应

Abstract

isolation mechanism of high-rise isolation structrue is investigated in the domain of time and frequency. With Etabs software high-rise frame-shear isolation building model and multi-story frame isolation building model are established, seismic waves are input into the two model above-mentioned, and the isolation layer accelerations of time-procedure are extracted, which are considered as seismic waves and input into the original seismic structure. With making a comparison of the acceleration response spectrum of the two models above before and after the isolation technique is applicated, it is found that multi-vibration mode isolation exist in both high-rise isolation building and multi-story isolation building, but the reduction of high-order vibration modes spectral acceleration is much more than the first-order vibration mode’ for high-rise structure while the reduction of high-order vibration modes spectral acceleration is almost the same to the first-order vibration mode’ for multi-story structure,which makes the effectiveness of multi-vibration mode isolation much higher in high-rise isolation structure than in multi-story isolation structure; with making a comparison of the isolation ratio of the largest base shear force before and after the isolation technique was applicated, it is found that the isolation ratio of the largest base shear force increases obviously with the superposition of the high-order vibration modes for high-rise isolation structure while the ratio has little change for multi-story isolation structure. From the two aspects above it can be explained that the effectiveness of multi-vibration mode isolation for multi-story isolation structure is low and in the meanwhile isolation mechanism is mainly on the first-order vibration mode isolation while the high-order vibration modes isolation of high-rise isolation structure is effective, which lead to the multi-vibration mode isolation.

关键词

高层隔震结构 / 多振型减震 / 反应谱 / 减震率

Key words

high-rise isolation structure / multi-vibration mode isolation / response spectrum / isolation ratio

引用本文

导出引用
商昊江;祁皑. 高层隔震结构减震机理探讨[J]. 振动与冲击, 2012, 31(4): 8-12,1
Shang Hao-jiang;Qi Ai. Discussion on isolation mechanism of high-rise isolation structrue[J]. Journal of Vibration and Shock, 2012, 31(4): 8-12,1

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