Sensitivity analysis of self-anchored suspension bridge sling tensioning to changes in main cable sag
To determine the cable tensioning scheme for the suspension bridge with a large main span and self-anchored cables,which uses the hybrid construction method of suspended cables first and cable-stayed cables later,based on the Egongyan Railway-Transit Bridge project,an ANSYS model is established to calculate the bridge from completion to the dismantling of the cable to a cable-free configuration.The Ernst formula is used to adjust the material equivalent elastic modulus.The study analyzes the displacement changes of the main cable under the action of single,double,and triple-point loads,with the majority of the cables not yet hung in the early stage and a small portion left unhung in the later stage through four scenarios.It examines the sensitivity of the main cable sag to different cable tensioning schemes and structural system transformation in engineering.The research shows significant changes in main cable displacement at mid-span and edge-span nodes under unit loads,with insensitivity at the main tower sides,mid-span,and main girder anchor ends.During the cable tensioning process,the deformation of the main cable at the tensioning point shows weak sensitivity to already tensioned points but strong sensitivity to adjacent untensioned points.In the early tensioning stage,the main cable displacement is nonlinear,shifting to linear in the later stage.
self-anchored suspension bridgesuspender stretchingsag sensitivitymain cable routingbridge constructionmain cable sag
万方数据
维普
