Durability and Reliability Analysis of Hangers of A Suspension Bridge with Spatial Cables under Extreme Wind Load
Spatial-cable suspension bridges consist of main cables and hangers inclined either to the inner or outer side in the transverse direction of the bridge.The hangers play a vital role in load transmission;however,their resistance decreases with the bridge's service life,leading to an increase in component failure probability and structural safety concerns.In this study,a steel box girder suspension bridge with a main span of 1666m serves as the engineering background,and seven designs of the suspension bridge with different inclination angles of main cables are proposed.By establishing the time-varying probability models of the resistance,internal forces under dead load and internal force under wind load only,the variation of the reliability index of hangers with the service period under the condition of the dead load and the extreme static wind load is analyzed and compared.The study shows that within ten years of the steel wire starting to corrode,the distribution of resistance of hangers affected by uniform and pitting corrosion does not reject the gamma distribution.From the 10th to 30th year,the distribution of resistance of hangers does not reject the Weibull distribution.The distribution of internal force of hangers under wind load only does not reject the logarithmic normal distribution within 40 years of service.The time-varying reliability index of all the hangers of the suspension bridge is uncorrelated with the inclination angle of the cables,and the variation of the time-varying reliability index of the hangers at different positions of the same suspension bridge is consistent.
suspension bridge with spatial cablesinclination angledurability of hangersextreme wind loadprobability modelreliability analysis
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