A model of symmetric broken wire damage in semi-parallel wire cable of long span cable-stayed bridges
In order to accurately evaluate the recovery length of semi-parallel wire stay cable after wire breakage,this study proposes a stay cable damage assessment model that considers the redistribution of cable force after wire breakage.Deformation compatibility equations,fracture equilibrium equa-tions,friction and contact force equations,and pinch effect of polyethylene sheath for semi-parallel wires are established.By determining the unknown quantity,the governing equation is established and the nonlinear least squares method is used to solve the recovery length of the broken wire.The damage coefficient of the stay cable along the axial direction is calculated based on the recovery length.The damage coefficient is applied to the area of the stay cables in the finite element model for correction.The iteration is repeated until the axial strain of stay cables meets the convergence condition.By taking the Changtai Yangtze River Bridge as the engineering background,the longitudinal distribution pat-terns of the broken wire recovery length and damage coefficient of the stay cables are clarified.
stay cablesemi-parallel wirerecovery lengthcable force redistributiondamage coefficient
万方数据
维普
