基于蒙特卡罗数值模拟的桥梁可靠度分析

Reliability Analysis of Bridge Based on Monte-Carlo Numerical Simulation

为了定量地研究桥梁在多种随机因素下的可靠度,采用蒙特卡罗法中的直接抽样法,对北盘江连续刚构桥在温度、风、车辆荷载、车辆冲击等随机变量作用下的结构可靠度进行了计算。通过对大桥在正常运营状态下的可靠度分析,采用弯矩和剪力失效准则,获得了大桥各截面的功能函数,并采用直接抽样法获得了北盘江大桥各截面的可靠度。分析结果形象直观,提高了评估效率,使维护决策的制定更加客观准确。

In order to investigate quantitatively reliability of bridges subjected to different random aspects,a direct sampling method based on the Monte-Carlo method is used to calculate the structural reliability of Bei Pan River continuous rigid-framed bridge subjected to random loading,such as temperature,wind,vehicle,and impact.Adopting the failure criteria combining shear and moment,performance functions of each section of the bridge is obtained,and then the reliability of each section of BeiPan River continuous rigid-framed bridge is calculated by use of the direct sampling method.It is shown that the visualized numerical results can enhance the efficiency of reliability evaluation and make the decision-making more objective and accurate.