摘要
基于改进的大质量法和位移法,分别求解非一致地震动激励下结构总反应和拟静力分量,用总反应减去拟静力分量得到动力分量,实现拟静力/动力分量的分离。结果表明,该方法简便实用,计算精度高,与理论结果符合好。以一座连续刚构桥为例,分析了非一致地震动激励下,结构地震反应拟静力/动力分量的基本特征和影响因素。结果表明,各支撑间的地震动位移差动对拟静力分量影响巨大,不容忽视;拟静力分量/动力分量相互叠加或消减,致使结构反应在多点激励作用下表现复杂。
With improved large mass method and displacement method respectively, the total response and quasi-static components of the internal forces in structures under seismic excitations are obtained directly, and then the dynamic components can be separated by subtracting quasi-static components from total components. This technique for quasi-static/dynamic components presented in the paper can yield results that are identical to those of theoretical method. Based on this technique, the dynamic response analysis of a bridge subjected to non-uniform seismic excitations has been carried out, and the quasi-static/dynamic components of internal forces are separated. It reveals that the quasi-static components depend on the relative displacements between the pier foundations. The seismic responses of structure members can be magnified or decreased irregularly by the resonance or counteraction of the quasi-static components and dynamic components.
出处
《工程力学》
EI
CSCD
北大核心
2013年第2期306-312,共7页
Engineering Mechanics
基金
国家自然科学基金项目(50708100)
国家重点基础研究发展计划项目(2011CB013601)
国家重大科技专项课题项目(2010zx06002-10)
关键词
多点激励
大跨结构
地震反应
拟静力分量
动力分量
non-uniform seismic excitation
large structures
seismic response
quasi-static component
dynamic component
