多维相关地震动作用下结构反应的反应谱法

A General Response Spectrum Analytical Method of Structure for Multi Dimension Coherence Ground Motion Inputs

根据地震动主轴模型的概念和转动分量与平动分量的关系,提出了多维地震动作用下结构的反应谱分析法。该方法可以考虑各分量的相关性和转动分量对结构反应的影响。结果表明:这种影响随结构轴线与地震动主轴方向之间的方位而变化;转动分量对结构角部构件的反应影响较大;当两正交水平方向地震动强度相同时,可不考虑各分量相关性的影响,各分量的反应可按平方和开平方根(SRSS)

Based on the concept of principal axes model and the relation between rotational and translational components of ground motion,a general response spectrum analytical method of structures for muti dimension ground motion inputs is proposed in the paper.The method can consider the effects of the coherence between different components and the rotational components on the response of structures.The following conclusion can be obtained:①The effects vary with the angle of position between the structural axes and principal axes of ground motion;②The effect of rotational components on the response of structural corner components is larger than others;③When the strengths of ground motion in the two perpendicular horizontal directions is equivalent,the effects of coherence between different components can be ignored,and the response between different components can be combined by the method of square root of square sum.