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泰州长江公路大桥初步设计推荐三塔悬索桥方案,合理选择中塔刚度并确保主缆与鞍座的抗滑移的安全稳定是该方案的关键问题。文章通过理论分析获得主缆与鞍座的摩擦系数公式,依据公式开展了主缆与中主鞍座间摩擦系数测试试验。试验模型按应力相似关系进行设计,全面模拟各索股与索股之间、钢丝之间、索股与鞍槽间真实的接触特性,采用与实桥基本相同的接触挤压应力,进行多索股和单索股的抗滑移试验。由规范公式验算可知,参考试验结果选用的综合摩擦系数确保了泰州大桥主缆与中主鞍座间抗滑移的安全稳定。
The preliminary design of Taizhou Yangtze River Highway Bridge recommended the scheme of the three-tower suspension bridge. It is a key issue of the scheme to reasonably choose the middle tower stiffness and ensure the safety and stability of anti-slip of the main cable and the saddle. The article obtains the friction coefficient formula of main cable and saddle through theoretical analysis and tests the friction coefficient between main cable and middle main saddle according to the formula. The test model is designed according to the stress similarities, and the simulation of the real contact characteristics between each strand and the strand, between the steel wires, between the strand and the saddle groove is carried out. The contact extrusion stress is basically the same as that of the real bridge, Anti-slip test for stocks and single-strand stocks. It is known from the formula calculation that the comprehensive coefficient of friction selected by the reference test results ensures the safety and stability of anti-slip between the main cable and the middle main saddle of Taizhou Bridge.