Previous investigations on corrosive evolutions are mainly based on the parallel wire stay cables, and related discussions on semi-parallel wire cables are limited. The semi-parallel wire cable has helical wire compositions and different wire bonding mechanisms, which may induce different corrosion degradation evolutions. In this study, the accelerated corrosion testes have been performed on semi-parallel wire cables with different high-density polyethylene sheath breaks. The corrosion evolution paths inside the cable were analyzed, and tensile loading tests were performed on corroded wires to get the degradation properties. The residual strength and failure process of corroded semi-parallel wire cables were studied with finite element methods. Due to the clamping effect from HDPE sheath and the tight wire arrangement inside the cable, the corrosive solution can hardly infiltrate to the inner layers. The corrosive extents varied significantly between wires at different layers and even between different sides of the same wire. With the corrosion distribution and mechanical properties of corroded wires, a finite element model for corroded semi-parallel wire cables was established. The helical wire composition, inter-wire contact and frictions, and the wire rupture features were all considered. Simulation results revealed that the high level of wire bonding effects in semi-parallel wire cables will induce the uneven wire force redistribution and helical shaped deformation, which effect may lead to faster strength degradation when comparing to parallel wire cables.

以前关于腐蚀演变的研究主要基于平行电线斜拉索，而有关半平行电线斜拉索的相关讨论也受到限制。半平行线电缆具有螺旋线成分和不同的线键合机制，这可能会导致不同的腐蚀退化演变。在这项研究中，加速腐蚀试验已在具有不同高密度聚乙烯护套断裂的半平行电缆上进行。分析了电缆内部的腐蚀发展路径，并对腐蚀的金属丝进行了拉伸载荷测试，以了解其降解性能。用有限元方法研究了腐蚀后的半平行电缆的残余强度和破坏过程。由于HDPE护套的夹紧作用以及电缆内部紧密的电线布置，腐蚀性溶液几乎不会渗入内层。腐蚀程度在不同层的导线之间，甚至同一导线的不同侧面之间，变化很大。根据腐蚀金属丝的腐蚀分布和力学性能，建立了腐蚀半平行金属电缆的有限元模型。都考虑了螺旋线的成分，线间的接触和摩擦以及线的断裂特征。仿真结果表明，半平行电缆中较高的导线键合作用会引起不均匀的导线力重新分布和螺旋形变形，与平行电缆相比，这种作用可能导致更快的强度下降。腐蚀程度在不同层的导线之间，甚至同一导线的不同侧面之间，变化很大。根据腐蚀金属丝的腐蚀分布和力学性能，建立了腐蚀半平行金属电缆的有限元模型。都考虑了螺旋线的成分，线间的接触和摩擦以及线的断裂特征。仿真结果表明，半平行电线电缆中较高的引线键合作用会引起不均匀的电线力重新分布和螺旋形变形，与平行电线电缆相比，这种作用可能导致强度下降更快。腐蚀程度在不同层的导线之间，甚至同一导线的不同侧面之间，变化很大。根据腐蚀金属丝的腐蚀分布和力学性能，建立了腐蚀半平行金属电缆的有限元模型。都考虑了螺旋线的成分，线间的接触和摩擦以及线的断裂特征。仿真结果表明，半平行电线电缆中较高的引线键合作用会引起不均匀的电线力重新分布和螺旋形变形，与平行电线电缆相比，这种作用可能导致强度下降更快。建立了腐蚀半平行电缆的有限元模型。都考虑了螺旋线的成分，线间的接触和摩擦以及线的断裂特征。仿真结果表明，半平行电缆中较高的导线键合作用会引起不均匀的导线力重新分布和螺旋形变形，与平行电缆相比，这种作用可能导致更快的强度下降。建立了腐蚀半平行电缆的有限元模型。都考虑了螺旋线的成分，线间的接触和摩擦以及线的断裂特征。仿真结果表明，半平行电缆中较高的导线键合作用会引起不均匀的导线力重新分布和螺旋形变形，与平行电缆相比，这种作用可能导致更快的强度下降。