【摘要】 以二自由度体系上下子结构的质量比、刚度比,下部子结构的屈服水平系数及自振周期等为计算参数编制程序,分析了这些参数以及场地条件对二自由度体系的位移及延性需求的影响规律,并回归得到了二自由度体系位移系数及延性需求的均值与标准差的计算公式,进而提出了二自由度体系概率地震位移延性需求分析的简化方法。最后,利用该方法对一全联采用板式橡胶支座联结的规则梁式桥进行了概率地震位移及延性需求分析,并与增量动力分析方法的结果进行对比,验证了该方法的有效性。更多还原

【Abstract】 The relationships between ductility demand and structural parameters of a two-degree-of-freedom system(2DOFS),such as the mass ratio,stiffness ratio of the upper to lower substructure,the yield level factor and vibration period of the lower substructure were analyzed.Influence rules of the parameters and field condition on displacement and ductility demand of 2DOFS were analyzed.The regression formulas of the mean value and standard deviation of the displacement factor and ductility demand of 2DOFS were obtained.Then,a simplified method of probabilistic seismic demand analysis of 2DOFS was proposed.In the end,the probabilistic seismic displacements and ductility demands of a regular beam bridge with plank rubber abutment were analyzed by the proposed method and incremental dynamic analysis method,and the validity of proposed method was proved by the comparison of results of the two methods.更多还原