近断层地震动作用下摩擦摆隔震体系的参数研究  

Parametric Research of Friction Pendulum Isolation System Subjected to Near-fault Ground Motions

作　　者：荣强[1] 张兴[1] 吴东[1] 

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《工程抗震与加固改造》2017年第2期85-92,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：山东省自然科学基金(ZR2013EEL020);国家自然科学基金(51478407)

摘　　要：首先以多自由度体系为研究对象,对近断层地震动作用下FPS隔震体系的地震响应进行分析。分析表明,随着摩擦系数的增大隔震支座位移显著减小,而顶层加速度峰值先逐渐减小达到最小值而后又逐渐增大。然后以摩擦摆隔震支座耗散的地震能量最大为目标函数,以顶层加速度峰值和隔震支座最大位移为约束条件,对FPS隔震体系的参数进行优化。研究表明,在近断层地震动作用下FPS隔震体系摩擦系数的最优取值范围为0.08~0.12,最优摩擦系数随着隔震周期的增大而略微增大,随着质量比和上部结构基本周期的增大最优摩擦系数的取值可稍偏小,上部结构阻尼比的变化对最优摩擦系数的取值范围影响较小。The multi degree freedom is considered as the research object, the seismic response of multi-story buildings isolated by the friction pendulum system （FPS） is investigated under near-fauh ground motions. The analysis indicates that the isolation bearing displacement decreases significantly with the increases of friction coefficient. The peak top floor acceleration decreases first, attains a minimum value and then increases with the increases of friction coefficient. The objective function selected for optimality is the maximization of seismic energy dissipation of FPS. The peak top floor acceleration and maximum displacement of isolation bearing are considered as constraint condition. The parameters of FPS isolation system are optimized. The research indicates that the optimum friction coefficient of the FPS is found to be in the range of 0.08 ~ 0. 12 under near-fauh motions. The optimum friction coefficient increases slightly with the increase of isolation period. The optimum friction coefficient decreases slightly with the increase of mass ratio and fundamental period of the superstructure. The optimum friction coefficient is not much influenced by the change of damping ratio of the superstructure.

关 键 词：近断层地震动 FPS隔震体系 摩擦系数 隔震周期 质量比 上部结构阻尼比 

分 类 号：TU352.12[建筑科学—结构工程]