大跨悬索桥CFRP主缆-索夹界面抗滑移性能  

Anti-slip Performance of Interface between Carbon Fiber-Reinforced Plastic Main Cable and Cable Clamp for Large-Span Suspension Bridges

作　　者：诸葛萍[1] 章子华[1] 汪思聪[1] 丁勇[1] 强士中[2] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211 [2]西南交通大学土木工程学院,四川成都610031

出　　处：《西南交通大学学报》2014年第2期208-212,239,共6页Journal of Southwest Jiaotong University

基　　金：国家863计划资助项目(2008AA11Z101);国家自然科学基金资助项目(51208269)

摘　　要：为解决大跨悬索桥碳纤维增强复合材料(CFRP)主缆鞍座处的抗滑移问题,研究了CFRP主缆-索夹界面的抗滑移性能,根据力的平衡原理推导了CFRP索股-索夹界面的摩擦因数计算式,结合模型试验和计算式,测试了19丝CFRP索股-索夹界面的摩擦因数.利用摩擦因数实测值对3 500 m跨悬索桥CFRP主缆索夹处抗滑移性能进行了实桥应用分析.结果表明:压纹类CFRP丝主缆-索夹界面的摩擦因数超过钢主缆-索夹界面,达到0.331,可满足相应的应用要求;大跨悬索桥主缆采用压纹类CFRP丝时,索夹内表面即使未作特殊处理,按常规悬索桥索夹设计方法对其进行设计也可满足抗滑移性能的要求.In order to solve the slip problem between main cable and clamp at saddles of large-span suspension bridges,the anti-slip performance of the interface between carbon fiber reinforced plastic （CFRP）cable and cable clamp was investigated. The frictional coefficient calculation formula of the interface was derived according to the equilibrium condition between the cable tension and the friction force on the interface. Based on this formula,the friction coefficient of the cable-clamp interface was obtained through laboratory model test using a cable composed of 19 CFRP tendons. Then,the test results of frictional coefficient were used to analyze the anti-slip performance of the main cable-clamp system of a CFRP cable suspension bridge with a main span of 3 500 m,where the CFRP tendons had a spirally indented surface. The results show that the friction coefficient of the CFRP main cable-cable clamp interface is up to 0. 331,which is higher than that of steel cable,and meet the requirement of engineering application. Therefore,when the CFRP tendons with a spirally indented surface are applied to the main cables of large-span suspension bridges,the cable-clamp interface is good enough to meet the requirement in anti-slip performance even if the cable clamps are designed in conventional shape and with an inner surface not granulated specially.

关 键 词：悬索桥 索夹 主缆 CFRP 摩擦因数 

分 类 号：U444[建筑科学—桥梁与隧道工程]