Fatigue Evaluation of Tsing-Ma Bridge subjected to Traffic Loading (in Chinese)

By using a three dimensional FEM model of Tsing-Ma Bridge, the dynamic response to traffic loading is analyzed and the global response of bridge is obtained. The comparison is made between the calculation results and the measured values. The local FEM model is developed to analyse the critical fatigue damage region and the stress concentration factor for critical region is obtained to get the hot spot stress around the weld toe. Based on the structural online health and safety online monitoring system, the representative block of cycles repeated everyday can be obtained. With the S-N curve based on hot spot stress approach, the fatigue life evaluation is made for the Tsing Ma Bridge,which gives informtion for the bridge health monitoring system