Vibrationnnduced Probabilistic Fatigue Life Assessment of a Suspension Bridge Carrying both Railway and Highway Traffic

摘要

In this paper, a fatigue reliability model integrated with stochastic stress concentration factor (SCF) is proposed based on r the traditional S-N curve method in combination with the Miner s damage cumulative rule. Firstly, three probabilistic r fatigue modelling methods , namely mean stress range method, integration method , and effective stress range method are r briefed. Then, the proposed fatigue reliability model is formulated integrating with the probability distribution of hot r spot stress range, and it is validated by conducting probabilistic fatigue life assessment of the sus -pension Tsing Ma r Bridge (TMB) with use of the long-term strain measurement data from the structural health monitoring (SHM) system permanently r installed on the bridge. Finally, the joint probability density function (PDF) of hot spot rainflow stress range as well as r the failure probability and reliability index versus fatigue life are obtained.