断索对钢-混组合梁斜拉桥力学性能的影响OA北大核心CSTPCD

In order to study the effect of cable breakage on the mechanical performance of steel-hybrid cable-stayed bridges,a steel-hybrid cable-stayed bridge under construction was used as the engineering background,and a finite element simulation model was established by using MIDAS/Civil.Firstly,the parameters of the model were compared with the design values and the field measured values to verify the rationality of the finite element model.Then,the changes of main beam line,cable force and tower displacement were analyzed after different locations and numbers of broken cables.The results show that the effect of side span breakage on main beam deflection and tower displacement is greater than that of main span breakage,and the effect of main span breakage on cable force is greater than that of side span breakage;the effect of long cable breakage on main beam line,cable force and tower displacement is the greatest;when the cable breaks symmetrically along the span of main beam,the line of main beam,cable force and tower displacement show symmetrical changes,and when two pairs of cables break,the cable force of the whole bridge is in accordance with the superposition principle.The whole bridge force is in accordance with the superposition principle when two pairs of cables break.