预应力混凝土箱梁桥主梁的可靠性分析

依据国家公路桥梁设计规范建立了极限状态函数，将混凝土强度、计算模式不确定性系数、荷载横向分布系数以及荷载增长系数作为随机变量，在此基础上，对一五跨预应力混凝土箱梁桥关键截面的可靠性进行了分析研究，从可靠度方面全面性评价了在服役期间结构不同关键截面的可靠性。

Reliability Analysis of Existing Prestressed Composite Box Girder Bridge Superstructures

The limit state function is established by identifying four distinct categories:limit state equation,random variables,deterministic parameters,and constant coefficients. The limit state equations are derived by strictly adhering to the load and capacity formulas and requirement set forth in China highway bridge specifications. For time-variant performance analysis,special emphasis is placed on the concrete carbonation which has an important effect on the reliability of existing prestressed composite box gir...