【摘要】 结构体系可靠度分析面临的主要问题是失效模式多,但通过pushover分析方法在一定情况下可以得到结构的最弱失效模式。本文将结构体系抗力等效为与结构特定损伤状况相关的结构的顶点位移,结构的地震作用效应由pushover分析及能力谱法求得。考虑结构体系抗力随机性的主要影响因素以及地震作用的随机性,分别求得了结构抗力及地震作用效应的概率分布参数,通过一次二阶矩方法求得了结构体系可靠度,并进一步研究了结构层数变化及耐久性退化因素对结构体系可靠度的影响。研究发现,结构体系的抗震可靠度水平随着结构层数的增加有减小的趋势,结构体系的抗震可靠度水平随着结构使用期增加而降低,降低幅度与薄弱层个数有关,薄弱层越多,降低幅度越大。更多还原

【Abstract】 The main problem of system reliability analysis is that there are too many failure modes.By pushover analysis,the weakest failure mode can be found in proper case.In this paper,the structural resistance is characterized by its top layer displacement,which is related to a predefined damage stage of the structure.The seismic action effect is calculated by pushover analysis and capacity demand-diagram method.The probability distribution parameter is calculated with the main random factor of structural resistance and the earthquake taken into account.Then,the earthquake-resistant system reliability is calculated by the first order and second moment method.The influence of story layers and durability deterioration on earthquake-resistant system reliability is evaluated.It is found that the earthquake-resistant system reliability tends to decease with the increase of structure floors and its service time.更多还原