【摘要】 拉索安全性关系索支承桥梁的安全运行与服役寿命，由于拉索老化、腐蚀、断丝等原因，拉索断丝成为拉索损伤的主要形式之一。在半平行钢丝拉索非对称断丝损伤模型的基础上，通过数值计算重点讨论了非对称断丝条件下断丝位置、螺旋角、钢丝间摩擦系数等参数对拉索内钢丝拉力分布及轴向刚度的影响。结果表明，非对称断丝引起的截面内钢丝拉力不均匀分布明显，螺旋角和钢丝间摩擦系数对拉索轴向刚度影响较大，应用并联模型设计计算时，误差较大，计算结果偏于不安全。更多还原

【Abstract】 Cable safety have great influence on operation and service life of bridge,Cables with broken wires become the main form of cable damage due to the effect of cable aging,corrosion and wire breaks. Based on the mechanical model for multilayered semi parallel wire cable with non-symmetric wire breaks,distribution of wires’ axial forces,magnification factors of axial force and axial stiffness of cable are highly discussed by numerical calculation. Comparing with parallel model,results show that non-symmetric break lead to obvious non-uniform distributions of wires’ axial forces,and that parameters affect the most to axial stiffness of cable are helix angle and inter-wire friction coefficient. The error is bigger while parallel model is applied,and the calculation results have proved to be unsafe.更多还原