RELIABILITY ANALYSIS OF CAST STEEL JOINT OF CHONGQING JIANGBEI AIRPORT AND IMPLEMENTATION OF RESPONSE SURFACE METHOD

By means of ANSYS parametric design language(APDL),cast steel joints of steel truss in Chongqing Jiangbei International Airport were modeled with a set of parameters.Through probabilistic design system(PDS)module in ANSYS programme,a numerical simulation techniqueresponse surface method(RSM) based on probability theory was adopted to analyze solid structure such as cast steel joints.According to single calculation results of finite element analysis,different failure stress was selected as the strength limit to obtain corresponding failure probability and reliability index of cast steel joint,and it was shown that the working status of cast steel joints was safe and reliable.From correlation coefficient and effect degree ratio of different variables,the significance of influencing factors of cast steel joints was revealed.Finally it was discussed some principles of failure mode selection for similar nodes.