近场多脉冲地震动作用下组合隔震结构抗震性能分析  

The Seismic Behavior Analysis of Near-field Multi Pulse Ground Motion on Composite Isolated Structure

作　　者：李慧[1] 刘迪[2] 杜永峰[1,2] 

机构地区：[1]西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [2]兰州理工大学,甘肃兰州730050

出　　处：《地震工程学报》2013年第3期563-568,共6页China Earthquake Engineering Journal

基　　金：国家自然科学基金(50978130;51178211)

摘　　要：采用速度脉冲分量与宽频分量相结合的方法,拟合了近场多脉冲地震波;构建了组合隔震结构的计算模型和运动方程,对组合隔震结构的动力响应进行仿真分析。结果表明:通过增设黏滞阻尼器可以有效控制结构的地震响应,减小隔震层位移,改善结构的受力。对于提高近场多脉冲地震作用下结构的安全性有显著作用。In recent years, the base isolation technique has been widely accepted and promoted as one of the most effective approaches for earthquake resistance due to its security and reliability for use with near-field earthquakes. Some researchers have studied and discussed the influence of va- rious parameters including peak ground acceleration/peak ground velocity （PGV/PGA）, input energy, peak values, and duration of the near-field earthquakes on the earthquake-resistant per- formance of constructions. Multi-pulse near-field earthquakes have a larger influence on the base isolation structure than do single-pulse near-field earthquakes; thus, more attention has been paid to the security problems of constructions under this working condition. The focus of this paper, therefore, is an isolation project in the northwest district in which the elastic-plastic response time history of near-field earthquakes was analyzed, and a viscous damper was added to improve the current earthquake-resistant performance of the base isolation structure. In this paper, a multi-pulse seismic wave in a near-field earthquake was simulated and syn- thesized using a MATLAB procedure and a combination of velocity impulse and broadband com- ponents. The design scheme for the X-type symmetrical distributed viscous damper was selected to reduce the additional internal force effect of the energy-dissipating brace on the beam and col- umn construction of the structure. On this basis, a computational model and equation of motion for the composite isolated structure was established. The earthquake response of the base andcomposite isolated structures was measured under three working conditions including the tro wave, the near-field wave of the Chi-chi earthquake recorded at Tcu075 observation and an artificially fitted multi-pulse wave. El Cen- station, Theoretical analysis and numerical simulation revealed the peak valueacceleration of the base isolation structure was larger than that of the composite isolated structure. The input energy of the st

关 键 词：近场多脉冲地震动作用 组合隔震结构 黏滞阻尼器 

分 类 号：TU457[建筑科学—岩土工程]