【摘要】 综合考虑强度退化、刚度退化、捏拢效应等典型滞回特性的影响,提出了双向激励下非弹性体系地震损伤分析的新型数值模型。结合所筛选的69条地震记录,定量地分析了双向地震激励、强度退化、刚度退化、捏拢效应等因素对地震损伤指标的概率统计特征的影响。计算结果显示:非弹性双自由度体系的地震损伤指标可以描述为Frechet或Lognormal分布随机变量;双向激励下非弹性双自由度体系的地震损伤指标可以近似表达为单向激励下非弹性单自由度体系的地震损伤指标的平方和开方;减小结构的屈服后刚度或考虑强度退化、刚度退化和捏拢效应的影响可以明显加剧结构的地震损伤程度。更多还原

【Abstract】 A novel numerical model for seismic damage analysis of inelastic two degree of freedom(2DOF) system under bi-directional excitations was developed by taking the strength degradation,stiffness deterioration and pinching effect into account.The influences of bidirectional excitations,strength degradation,stiffness deterioration and pinching effect on statistical characteristics of seismic damage index of inelastic 2DOF system were investigated using 69 selected earthquake records.The results show that seismic damage index of inelastic 2DOF system can be described as either the Lognormal or the Frechet distribution variable;the seismic damage index of inelastic 2DOF system can be approximated by the square root of sum of square(SRSS) of seismic damage index of single degree of freedom(SDOF) system;an decrease in post-yielding stiffness or consideration of strength degradation,stiffness deterioration and pinching effect may increase the seismic damage index remarkably.更多还原