Monte Carlo numerical simulation and its application in probability analysis of long span bridges

摘要

To get the probability of long span bridges under the influence of external random factors,the Monte Carlo method using Latin hypercube sampling is applied.Combined with the condition assessment system on Runyang Suspension Bridge,which is the longest suspension bridge in China,the structural probabilities in normal and damaged situations are calculated with the external random factors considered including environmental temperature,wind load,load of vehicles,etc.The main assessment items contain the maximal vertical displacement of girder,the maximal stress of cables,the maximal horizontal displacement of towers etc.Finally,the probabilities and their cumulative distribution functions are provided.The analysis results can be plotted on line in a clear and vivid way,so the efficiency of assessment is increased and the decision-making of maintenance is more objective and accurate.