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地锚索的设置是在加劲梁跨度小于主缆跨度的情况下采取的措施,主要出现在山区大跨度悬索桥中,由于情况少见,这方面研究鲜见报道。笔者以矮寨特大悬索桥为工程背景,首先对地锚索的设计与施工进行了介绍;然后针对地锚索的设置与索力大小对成桥状态与正常使用极限状态的影响进行了计算分析比较,得出了地锚索可以改善加劲梁与端吊索受力、稳定活载支反力、优化主缆局部线形的结论,同时确定了地锚索成桥设计索力的合理取值范围;最后对地锚索的安装与张拉过程进行了分析,给出了合理的施工阶段与计算结论。
The setting of ground anchor cable is taken when the span of the stiffening girder is less than the span of the main cable, which mainly appears in the long span suspension bridge in the mountainous area. Due to the rare situation, little research has been reported on this area. The author takes Aizhai large suspension bridge as the engineering background, firstly introduces the design and construction of the ground anchor cable. Then, the paper analyzes and compares the influence of the setting of the ground anchor cable and the cable force size on the state of the bridge and the limit state of normal use It is concluded that the ground anchor cable can improve the force of the stiffening girder and the end sling, stabilize the live load and support reaction force and optimize the local line shape of the main cable. Meanwhile, the reasonable range of the cable force of the ground anchor cable is established. Finally, the installation and tensioning process of ground anchor cable are analyzed, and a reasonable construction stage and calculation conclusion are given.