作　　者： ; ; ;

机构地区： 兰州理工大学土木工程学院西部土木工程防灾减灾教育部工程研究中心

出　　处： 《地震工程学报》 2013年第2期208-212,共5页

摘　　要： 近场地震动具有很高的加速度峰值和长周期的速度脉冲,因此能够对结构造成严重的破坏。基础隔震是一种有效的减震技术,然而这种单一的减震手段在低频具有很高能量的近场脉冲型地震动作用下已不能确保结构的安全,必须寻求新的减震策略。本文将速度脉冲模型与随机地震地面运动模型联合来生成近场脉冲型地震动,并以此作为激励,用MATLAB对近场脉冲型地震动作用下TMD-基础隔震混合控制结构及独立基础隔震结构的地震响应进行求解,比较研究该混合控制结构的减震效果。结果表明该混合控制方式可以有效地控制结构的位移,而对加速度的控制效果不明显。 Near-fault ground motions can cause severe damage to structures because of its high peak accelerations and macrocyclic velocity pulses.In the last two decades,the seismic isolation technique,which was proved to be very effective for the seismic protection of new constructions and the seismic retrofitting of existing ones,had been applied for buildings,bridges,industrial facilities,and structures of historical value as well.As a consequence,design guidelines for seismically isolated structures have been developed in many countries with a high seismic hazard.The insertion of an isolation system at the base of a building structure allows the horizontal seismic loads to be reduced through a decoupling of the structure motion from that of the soil;moreover,the superstructure behaves like a fixed or base isolated structure along the vertical direction,depending on the value,respectively very high or very low,of the ratio between the vertical stiffness of the isolator and the horizontal one.Base isolation technique,taken as an effective method to control structure＇s vibration that is induced by earthquake ground motions,has been widely accepted,however,only such an approach can not ensure structure＇s safety under near-fault pulse-like ground motions with high energy in low frequency band,because strong near-fault ground motions are characterized by long-duration horizontal pulses and very large displacements,which can lead to an oversizing of the isolation system and an amplification of the response of a base isolated structure.Specifically,the frequency content of the motion transmitted by the isolators to the superstructure can become critical when the pulse intensity is so strong that the superstructure undergoes plastic deformations.Moreover,the structural response can be amplified due to the long duration of the pulse.To overcome these problems,many authors have proposed a lot of solutions based on different kinds of isolators and dampers.Nevertheless,some problems remain unsettled if additional damping is adop

关 键 词： 近场地震动 速度脉冲 基础隔震 混合控制

领　　域： [建筑科学]