近断层强震作用结构动力可靠度分析  

Dynamic reliability analysis of structures subjected to near-fault strong ground motions

作　　者：周继磊[1,2] 杨迪雄[2] 陈国海[2] 韩昌瑞[1] 

机构地区：[1]山东理工大学交通与车辆工程学院,山东淄博255049 [2]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116023

出　　处：《建筑结构学报》2016年第7期136-143,共8页Journal of Building Structures

基　　金：国家自然科学基金项目(51478086;11332004);山东省自然科学基金项目(ZR2011EEM020;ZR2015EL048)

摘　　要：近断层脉冲型地震动峰值参数在不同方位上差异明显,其最强脉冲能量所对应方位上的地震动时程对结构的破坏远高于普通的地震动记录。为此,分别利用蒙特卡罗模拟和子集模拟方法研究了单自由度系统和多高层框架结构在最强脉冲能量地震动输入作用下的动力可靠度,分析了随机脉冲模型参数的变异性对不同周期结构动力可靠度的影响。研究表明:脉冲周期、峰值地面速度和脉冲波数量对结构的可靠度影响较大,在动力可靠度和基于性能抗震设计等概率分析时需考虑其变异性。而随机脉冲地震动模型其他参数对结构的动力可靠度影响较小,可取均值,不考虑其变异性。对框架结构的动力可靠度分析表明,引起框架结构发生破坏的主要因素为低频脉冲的作用,而高频成分的影响较小。The peak parameters for near-fault impulsive ground motions have obvious dltterences in various orientations. The ground motions in the orientation corresponding to the strongest pulse energy impose more serious demand on structures than that of ordinary ground motions. Therefore, the Monte Carlo simulation and Subset simulation were respectively applied to compute the dynamical reliability of nonlinear single degree of freedom system and multiple and tall frame structures subjected to near-fauh ground motions with strongest energy. The influences of variation of stochastic pulse model parameters on structural dynamic reliability with different fundamental periods were explored. Moreover, it is demonstrated that the variation of pulse period, peak ground velocity and pulse waveform number have a significant effect on structure reliability and should not be ignored in reliability analysis. The variations of the other parameters of stochastic impulsive ground motion model have little influence on structural reliability, and the mean values are just considered in reliability analysis. Finally, it is indicated from the dynamical reliability analysis of frame structure that, the low frequency pulse is the dominant factor that causes the damage of frame structure, and the influence of high frequency component on structure is less.

关 键 词：近断层地震动 随机合成 脉冲模型 最强脉冲能量 单自由度系统 框架结构 子集模拟 动力可靠度分析 

分 类 号：TU352.1[建筑科学—结构工程] TU311.41