ANALYSES ON FATIGUE RELIABILITY OF STEEL-BOX GIRDER MEMBERS OF LONGSPAN BRIDGES.
Long-span steel bridge is subjected to impacts of random variable such as vehicle loads, sectional dimensions and real value of material constants, therefore, analyses on fatigue reliability in view of probability and statistics is necessary. For hyperstatic structures such as long-span bridges, fatigue damage increments induced by vehicle loads cant be directly denoted as explicit functions of loads, sectional dimension and elastic module, so that this paper is aimed at analyzing fatigue reliability of steel-box girder members of a long-span bridge by combining the response surface method with non-linear finite element computation to the bridge. A standard fatigue vehicle was used to exert moving loads on steel-box girders, stress range and fatigue damage increment were calculated by using the commercial software ANSYS, and then response surface method was adopted to derive the explicit function of damage increment of steel-box girder members related to each random variable. Finally, JC procedure (Normalized Distribution Algorithm) and Monte Carlo simulation were respectively employed to calculate the fatigue reliability index and failure probability of box-girder members. As a case study, analyses on fatigue reliability of the box-girder member of Runyang Cable-stayed Bridge was carried out, and it could be found out that fatigue reliability index is lower, which implies that fatigue failure is a main failure mode for the long-span bridge.
Fatigue reliability response surface method steel-box girders JC method Monte-Carlo simulation
Y. Wang Z.X. Li H. Jin
College of Civil Engineering, Southeast University, Nanjing, 210096 China.
国际会议
北京
英文
1659-1668
2008-10-27（万方平台首次上网日期，不代表论文的发表时间）