考虑荷载作用顺序的结构可靠度分析方法

针对JCSS推荐的荷载效应组合法假设荷载效应之间既相互独立又完全相关的内部矛盾和时段分析法对工程中的非平稳荷载效应过程无法实现有效分析的问题，对考虑荷载作用顺序的结构可靠度分析方法进行了研究.首先提出了非平稳荷载效应过程下的结构可靠度分析方法;其次考虑荷载作用顺序的影响，改进了结构在受多时段荷载作用下的可靠度计算模型;最后运用跨阈理论分析了结构损伤对可靠度的影响，推导出综合考虑非平稳荷载过程、荷载作用顺序和结构损伤的可靠度计算公式.算例分析表明:该方法适用性更广泛，计算结果更真实可靠.

Structural Reliability Analysis Method Considering Load Sequence

In view of the contradiction which load effects are assumed to be both independent and completely related in load-effect combination method recommended by JCSS ， and the ineffectiveness of time-interval analysis method for non-stationary load-effect process in engineering， structural reliability analysis method considering load sequence is performed. Firstly， the structural reliability analysis method under non-stationary load effect process is proposed. Secondly， the structural reliability calculation model under multi-period load considering load sequence is improved. Finally， the influence of structural damage on reliability is analyzed by cross-threshold theory， and the formula for calculating structural reliability considering non-stationary load process， loading sequence and structural damage is derived. The results showed that the method is more applicable and the calculation results are more realistic and reliable.