【摘要】 针对实际地震动作用的多维性和结构非线性反应的空间耦合特点,建立了双向地震激励的单质点双自由度模型,假定此模型的恢复力关系符合二维屈服面函数。按硬、中、软土场地分类共选择89组双向地震动记录作为系统的激励,建立了统计平均的标准化弹塑性位移反应谱。分析了场地类别、延性系数、两主轴方向周期比对标准化弹塑性位移谱的影响。更多还原

【Abstract】 In view of the space coupling characteristics of multi- dimensional and structural nonlinear responses of actual earthquake excitations,the model of single mass bi- degrees of freedom system subjected to bi- directional earthquake excitations is established,in which the yield rule of the system is determined by two- dimensional yield- surface plasticity function. The 89 pair bi- directional earthquake motion records of hard soil site,intermediate soil site and soft soil site are selected as earthquake excitations of the single mass bi- degrees of freedom system,and the mean normalized elastic- plastic displacement spectra of constant ductility factors are established. The influence factors of normalized displacement spectra such as soil site,ductility factor and period ratio of bi- directions are analyzed.更多还原