极端地震下惯容器-弹簧-阻尼装置对隔震结构减震效果研究

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振动与冲击 ›› 2019, Vol. 38 ›› Issue (12) : 112-117.

论文

莊初立1,五十子幸树2,张永山1

作者信息 +

Effectiveness of an inerter-spring-damper device in the seismic response control of a isolated structure under extreme earthquakes

CHONG Cholap1,KOHJU Ikago2,ZHANG Yongshan1

Author information +

文章历史 +

摘要

通常在隔震层附加黏滞阻尼系统以增加阻尼从而减少大震下的隔震层位移，但可能带来结构加速度响应的增加，故在减少隔震层位移与加速度响应增加这两者间需要平衡。本文将惯容器-弹簧-阻尼装置(ISD)应用于隔震结构受极端地震作用时抑制过大的隔震层位移，同时控制加速度响应的增加，ISD装置由惯容器串联弹簧单元和阻尼单元构成，该装置具备放大表观质量和对主系结构进行调谐。本文基于定点理论推导了无阻尼单自由度体系受简谐荷载作用时的ISD最优参数封闭解，且对全频段最大值的控制效果好于既有文献的优化解。采用一栋6层隔震建筑为例进一步检验ISD的控制效果，分别附加ISD和线性黏滞阻尼器(LVD)在隔震层，ISD的参数由定点理论推导的最优解确定，从而进行极罕遇地震水准下的性能对比分析。算例结果表明，ISD装置性能优于LVD，ISD装置能更有效地改善极罕遇地震下的结构性能状况，在减少隔震层位移的同时也能减轻加速度响应，结构楼层剪力与倾覆弯矩有所降低。

Abstract

This paper considers the use of an inerter-spring-damper (ISD) device to suppress excessive seismic responses of seismic isolated structures subjected to extreme earthquakes.The ISD consists of an inerter, a device that exerts forces proportional to the relative acceleration of its two ends, coupled with a series springs and dampers.The ISD is a device that can utilize amplified apparent mass and tuning effects.Based on the fixed-points theory, we derived closed-form expressions for optimal ISD tuning parameters for harmonically excited single-degree-of-freedom primary systems.The performance of the ISD was compared to the linear viscous damper (LVD) located at the isolation story, a 6 story seismic isolated structure was presented as an example, and the design of ISD optimum parameters was determined by optimum tuning formulae.The performance of the isolated structure containing an ISD and LVD device subjected to extreme earthquakes were investigated.The results show that utilizing the optimum ISD can result in an improvement in the seismic performance in comparison to the LVD.
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导出引用

莊初立1,五十子幸树2,张永山1. 极端地震下惯容器-弹簧-阻尼装置对隔震结构减震效果研究[J]. 振动与冲击, 2019, 38(12): 112-117

CHONG Cholap1,KOHJU Ikago2,ZHANG Yongshan1. Effectiveness of an inerter-spring-damper device in the seismic response control of a isolated structure under extreme earthquakes[J]. Journal of Vibration and Shock, 2019, 38(12): 112-117

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