A composite wrapping system for main cable protection of suspension bridges was designed by using prepreg fiber-reinforced composites and nitrile rubber. The circumferential expansion performance of the system was tested, and the curves of circumferential bearing capacity and radial displacement of the components were obtained. Failure modes of each group of components were compared and analyzed. The results show that most of the components are vertically fractured at the lap transition. The increase of the number of prepreg layers contributed the most to the circumferential bearing capacity of components, with a growth rate of 65.31%~109.01%. The increase of rubber belt layers had the most significant effect on the radial displacement of the components, with a growth rate of 7.06%~23.5%. In the initial stage of the test, the strain of each part of the component was smaller due to the compaction by the loading device, and the strain value of the component was generally linearly increased during the loading process, during which the strain of the overlap was the smallest. The calculated cross-sectional temperature deformation of the main cable is in good agreement with the experimental data. The application of the rubber belt increases the deformation of the main cable; therefore, the protection system for the main cable could have more deformation redundancy and delay the arrival of the ultimate strain of the outer prepreg wrap.

中文翻译：

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悬索桥主缆保护复合包覆系统的周向膨胀性能

采用预浸料纤维增强复合材料和丁腈橡胶设计了一种用于悬索桥主缆保护的复合缠绕系统。对系统的周向膨胀性能进行了测试，得到了部件的周向承载力和径向位移曲线。对各组元件的失效模式进行比较和分析。结果表明，大部分部件在搭接过渡处垂直断裂。预浸料层数的增加对构件周向承载力的贡献最大，增长率为65.31%~109.01%。橡胶带层数的增加对构件径向位移的影响最为显着，增长率为7.06%~23.5%。在测试的初始阶段，由于加载装置的压实，构件各部分的应变较小，加载过程中构件的应变值一般呈线性增加，其中搭接处的应变最小。计算得出的主缆截面温度变形与实验数据吻合较好。橡胶带的应用增加了主缆的变形；因此，主缆的保护系统可以有更多的变形冗余，并延迟外层预浸料包的极限应变的到来。计算得出的主缆截面温度变形与实验数据吻合较好。橡胶带的应用增加了主缆的变形；因此，主缆的保护系统可以有更多的变形冗余，并延迟外层预浸料包的极限应变的到来。计算得出的主缆截面温度变形与实验数据吻合较好。橡胶带的应用增加了主缆的变形；因此，主缆的保护系统可以有更多的变形冗余，并延迟外层预浸料包的极限应变的到来。