Reliability of micro/macro- fatigue crack growth behavior in the wires of cable-stayed bridge
The principle of least variance is applied to evaluate the reliability of fatigue crack growth behavior in the steel wires of Runyang cable-stayed bridge.Micro/macro- crack growth model is proposed in that both micro- and macro scale effects can be included.These features are best exhibited by the normalized generic parameters that reflect the effects of material,loading and geometry.Attention is paid to the 5mm diameter wire in cables under traffic that is reflected by the additional applied tension force.Combination of theory of least variance and the dual scale model offers a new perspective for the reliability analyses of structural systems.The aim is to demonstrate there exists a time range of high reliability for the crack length history that correspond to the least variance of the time dependent R-integrals.The results coincide with the scale range established empirically by in-service health monitoring for micro-macro cracking.Such agreements are encouraging with regard to the potential application of principle of least variance in multiscale reliability assessment for multi-component and multi-function systems.
Reliability Least variance Micro/macro- crack growth model Cable-stayed bridge Fatigue
Keke Tang
Key Laboratory of Pressure Systems and Safety,Ministry of Education,School of Mechanical Engineering and Power Equipment,East China University of Science and Technology,Shanghai 200237,China;Department of Engineering Mechanics,Southeast University,No.2 Si Pai Lou,Nanjing 210096,China
国际会议
北京
英文
1-10
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）