拟负刚度隔震Benchmark模型减震效果及适应性  

Effectiveness and adaptability analysis of smart base isolated benchmark model with pseudo-negative stiffness control

作　　者：龚微[1] 熊世树[1,2] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]华中科技大学控制结构湖北省重点实验室,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2015年第8期7-11,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：基于国际通用Benchmark隔震模型,提出了一种基于磁流变阻尼器的负刚度智能隔震控制策略及其一组有效控制参数.采用Matlab模拟分析了双向地震作用下普通隔震、H2/LQG主动控制、H2/LQG-clipped半主动控制、Passive-on被动控制和拟负刚度控制时模型的地震反应,对比分析了250条不同场地地震波下五种控制方式的控制效果和适应性.结果表明:拟负刚度智能隔震集合了主动和传统半主动控制的优点,其综合控制性能最优,能同时有效降低大地震时隔震层位移和中小地震时上部结构地震反应.研究了不同断层距的近场地震下不同控制方式隔震结构地震反应,得出了近场影响系数.A pseudo‐negative stiffness control strategy based on magneto‐rheological damper and a set of corresponding parameters which was carefully chosen were proposed based on Phase I base isolated Benchmark building .By using Matlab ,five control strategies ,including general base‐isolation with‐out any control device ,active control based on H2/LQG algorithm ,semi‐active control based on H2/LQG‐clipped algorithm ,Passive‐on control with constant voltage and negative stiffness control ,were applied to the benchmark model to evaluate their effectiveness and adaptability in reducing response quantities of the building subjected to 250 sets of bi‐direction seismic records under different site con‐ditions .Numerical simulation results show that the proposed negative stiffness control strategy is op‐timal which can reduce the base displacement in extreme ground motions as well as the response of su‐perstructure in small and moderate ground motions .Finally ,the amplification effect of different fault distance on various structural responses under different control strategies was studied .

关 键 词：智能隔震 拟负刚度控制 半主动控制 BENCHMARK模型 近场地震 

分 类 号：TU352.1[建筑科学—结构工程]