Finite element model updating and validating of Runyang Suspension Bridge based on SHMS

摘要

Based on the finite element (FE) program ANSYS,a three-dimensional model for the Runyang Suspension Bridge ( RSB) is established.The structural natural frequency,vibration mode,stress and displacement response under various load cases are given.A new method of FE model updating is presented based on the physical meaning of sensitivity and the penalty function concept.In this method,the structural model is updated by modifying the parameters of design,and validated by structural natural vibration characteristics,stress response as well as displacement response.The design parameters used for updating are bounded according to measured static response and engineering judgment.The FE model of RSB is updated and validated by the measurements coming from the structural health monitoring system (SHMS),and the FE baseline model reflecting the current state of RSB is achieved.Both the dynamic and static results show that the method is effective in updating the FE model of long span suspension bridges.The results obtained provide an important research basis for damage alarming and health monitoring of the RSB.