Analysis of Influence of Suspender Cable Force Change on Bending Moment of Stiffening Girder of Super-Long Span Suspension Bridge
After long-term service on a long-span suspension bridge,the cable force of some hangers can easily deviate from that of the completed bridge.However,the effect of the change in local hanger cable force on the bending moment of the whole main girder is unknown.In this paper,the Wuhan Yangluo Bridge is taken as the research object,and numerical analyses of a long-span suspension bridge are carried out.The validity of the finite element model is verified by comparing it with actual bridge test data.Based on the verified numerical model,a parametric analysis was carried out to study the effect of 10％,15％,and 20％negative deviations of local single and three suspender cable forces(less than the cable force of the bridge)on the maximum bending moment of each beam section of the steel box girder.The results show that the negative deviation of single or three suspender cable forces is linearly related to the bending moment variation of a steel box girder.When the single suspender cable force has a 20％negative deviation from the bridge state,the bending moment of the steel box girder increases by 40％to 97％.When the cable force of the three suspenders has a negative deviation of 20％compared with the bridge state,the bending moment of the steel box girder increases by 195％to 445％.
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