An Improved Model for Fatigue Reliability Assessment of Steel Bridges:Formulation and Application
In this study, a method for monitoring-based fatigue reliability assessment of steel bridges is addressed, and exemplified to evaluate the probabilistic fatigue life of the welded structural component of a long-span suspension bridge instrumented with a sophisticated structural health monitoring (SHM) system.An im proved fatigue reliability assessment model is formulated by taking into account the effects of steel corrosion and stress concentration in the framework of a continuous probabilistic formulation of Miners damage cumula tive rule.The method of finite mixture distributions in conjunction with the mixture parameter estimation ap proach are employed to deal with the uncertainties inherent in the monitoring data.A comparative study of fi nite mixture modeling of the stress spectrum is carried out by use of the expectation maximum algorithm (EMA) and the genetic algorithm (GA) for estimation of the unknown mixture parameters.The failure probability and reliability index versus fatigue life are achieved by incorporating the developed multimodal probability distributions of fatigue-relevant parametric variables into the proposed fatigue reliability model.
X.W.Ye D.B.Fu Y.Q.Ni K.Y.Wong S.F.Jiang
Department of Civil Engineering, Zhejiang University, Hangzhou, China College of Civil Engineering, Fuzhou University, Fuzhou, China Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, Highways Department, The Hong Kong SAR Government, Hong Kong, China
国际会议
哈尔滨
英文
620-626
2013-07-06（万方平台首次上网日期，不代表论文的发表时间）