三塔自锚式悬索桥主缆抗滑移研究

摘要

Since the parameters such asμand K for calculating the main cable anti-sliding of the saddle which are not specified at home,with reference and comparative analysis of the domestic and foreign relevant specifications,test and literature data,the friction coefficient between main cable and saddle is suggested to be 0.2 and the safety coefficient of main cable anti-sliding is suggested to be 1.65 in Lou Zhou Bridge.In order to ensure constraint systems of middle saddle,a comparative analysis is made between main saddle locking system,finite displacement system and other constraint systems, the main saddle locking constraint system is finally chosen and the main saddles are optimized after the comprehensive consideration of various factors such as structure stress,durability and economy.%由于国内计算鞍槽内主缆抗滑移的参数μ和 K 没有确切的规定，文中参照国内外现行有关规范、试验和相关文献资料进行对比分析，对于螺洲大桥，建议主缆与鞍座鞍槽间摩擦系数μ＝0．2，抗滑移安全系数 K ＝1．65。为了确定主索鞍的约束体系，采用主鞍座锁定、有限位移等多种约束体系进行对比分析，并且综合考虑结构受力、耐久性，以及经济性等因素，选择了主索鞍固结方式的约束体系，并对主索鞍进行了优化。