钢筋混凝土T梁桥正截面抗弯时不变可靠度分析

Time Invariant Reliability Analysis of Flexural Strength of Reinforced Concrete T-beam Bridge

对桥梁时不变可靠度的分析是判别桥梁实际承载能力,以及运营状态的前提,也是桥梁时变可靠度计算的基础。文中以一座20m普通钢筋混凝土T梁桥为例,开展了普通钢筋混凝土T梁桥时不变可靠度分析,建立了普通钢筋混凝土T梁桥时不变可靠度计算的极限状态方程,分析了变量或参数的概率分布特征,得到了钢筋混凝土T梁桥正截面抗弯时不变可靠度,可为桥梁运营状态评估提供参考。

The analysis of time invariant reliability is a prerequisite for determining the carrying capacity of the bridge as well as the actual operating condition,and it is the basis of varying reliability calculation.Taking a 20 m T-beam bridge as example,the invariant reliability study of reinforced concrete T-beam bridge is carried out in this paper,the limit state equation of the reinforced concrete bridge is established,the probabilistic distribution of variable is analyzed,and the time invariant reliability is obtained,which can provide a reference for the assessment of bridge operating state.