【摘要】 对承载力退化的修正理想弹塑性(MEPP)、剪切滑移(SSP)和双线性(BIL)滞回模型的单自由度体系进行弹塑性动力时程分析,得到了考虑承载力退化时不同场地、延性系数等参数组合下双周期标准化的地震力调整系数谱,结果表明:承载力退化对BIL和SSP模型的影响不大,对MEPP模型的影响则随退化值增大而增大.计算了承载力有退化的MEPP模型的基底剪力影响系数谱αEK,并给出了简化计算公式,进而得到与退化模型等效的理想弹塑性模型.对有退化模型的承载力需求是理想弹塑性模型的αEK倍,同时变形能力绝对值也为相同延性系数的理想弹塑性模型的αEK倍.更多还原

【Abstract】 This paper presents an analysis of the seismic force modification factor R of single degree of freedom system including strength degrading modified elastic-perfectly plastic(MEPP) model,bilinear elastic(BIL) model and shear-slipped elastic-plastic(SSP) model for different site and ductility factors.Results reveal that the strength degradation has almost no influence on the R spectra of BIL and SSP model,but for MEPP model,its influence increases with the degradation,which cannot be neglected.The system coefficient spectra of base shear αEK were constructed to analyze the influence of the degradation of strength on seismic force modification factors.An ideal elastic-plastic model is proposed which is equivalent to the degradation model.For the strength degrading system,the strength demand and the deformation-capacity demand are found to be αEK times of the ideal elastic-perfectly plastic model.更多还原