Hybrid reliability model for fatigue reliability analysis of steel bridges  

作　　者：曹珊珊 雷俊卿 

机构地区：[1]School of Civil Engineering,Beijing Jiaotong University

出　　处：《Journal of Central South University》2016年第2期449-460,共12页中南大学学报（英文版）

基　　金：Projects(51178042,51578047)supported by the National Natural Science Foundation of China;Project(C14JB00340)supported by the Innovative Research Fund in Beijing Jiaotong University,China;Project(2014-ZJKJ-03)supported by Science and Technology Research and Development Fund of the China Communications Construction Co.,LTD

摘　　要：A kind of hybrid reliability model is presented to solve the fatigue reliability problems of steel bridges. The cumulative damage model is one kind of the models used in fatigue reliability analysis. The parameter characteristics of the model can be described as probabilistic and interval. The two-stage hybrid reliability model is given with a theoretical foundation and a solving algorithm to solve the hybrid reliability problems. The theoretical foundation is established by the consistency relationships of interval reliability model and probability reliability model with normally distributed variables in theory. The solving process is combined with the definition of interval reliability index and the probabilistic algorithm. With the consideration of the parameter characteristics of the S-N curve, the cumulative damage model with hybrid variables is given based on the standards from different countries. Lastly, a case of steel structure in the Neville Island Bridge is analyzed to verify the applicability of the hybrid reliability model in fatigue reliability analysis based on the AASHTO.A kind of hybrid reliability model is presented to solve the fatigue reliability problems of steel bridges. The cumulative damage model is one kind of the models used in fatigue reliability analysis. The parameter characteristics of the model can be described as probabilistic and interval. The two-stage hybrid reliability model is given with a theoretical foundation and a solving algorithm to solve the hybrid reliability problems. The theoretical foundation is established by the consistency relationships of interval reliability model and probability reliability model with normally distributed variables in theory. The solving process is combined with the definition of interval reliability index and the probabilistic algorithm. With the consideration of the parameter characteristics of the S-N curve, the cumulative damage model with hybrid variables is given based on the standards from different countries. Lastly, a case of steel structure in the Neville Island Bridge is analyzed to verify the applicability of the hybrid reliability model in fatigue reliability analysis based on the AASHTO.

关 键 词：hybrid reliability model （HRM） consistency relationships linear and bilinear S-N curve fatigue reliability normal distribution 

分 类 号：U441.4[建筑科学—桥梁与隧道工程] U446[交通运输工程—道路与铁道工程]