基于蒙特卡罗数值模拟的大跨桥梁状态评估

为了定量地研究大跨桥梁在多种随机因素下的可靠度,采用蒙特卡罗数值模拟方法,对润扬长江公路大桥(中国跨度最大的悬索桥)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计算。通过对大桥在正常运营和损伤状态下的可靠度分析,获得了大桥主缆应力、吊索应力、桥塔位移以及钢箱梁线形等重要指标的可靠度和累积分布函数,其分析结果形象直观,提高了评估的效率,使维护决策的制定更加客观准确。

Condition Assessment of Long Span Bridges Using Monte Carlo Numerical Simulation

To quantify the reliability of long span bridge under the influence of external random factors,the paper adopted Monte Carlo numerical simulation method.Combined with the condition assessment system on Runyang bridge,the longest suspension bridge in China,the structural reliabilities in normal and damaged situations were calculated with the external random factors considered including the environmental temperature,the wind load,the vehicles load etc.The main assessed items contain the maximum vertical displacement of girder,the maximum stress of cables,the maximum horizontal displacement of tower etc.Finally the reliabilities and their cumulative distribution functions were provided. The analysis results can be plotted on line in a clear and vivid way,so the efficiency of assessment is increased and the decisionmaking of maintenance is more objective and accurate.