接触压力下CFRP板-钢界面摩擦系数试验研究  

Experimental study on frictional coefficient at CFRP-plate-steel interface under contacting pressure

作　　者：叶华文[1] 王正源 周渝 叶杨帆 刘德军 占玉林[1] Ye Huawen;Wang Zhengyuan;Zhou Yu;Ye Yangfan;Liu Dejun;Zhan Yulin(Southwest Jiaotong University,Chengdu 610031,China;Jiaxing University,Jiaxing 314001,China)

机构地区：[1]西南交通大学,四川成都610031 [2]嘉兴学院,浙江嘉兴314001

出　　处：《土木工程学报》2023年第6期100-107,共8页China Civil Engineering Journal

基　　金：国家自然科学基金(51208430)。

摘　　要：CFRP板-钢界面摩擦系数是预应力CFRP锚具锚固性能的关键参数,为增大摩擦系数以提高锚固效率,首先采用抛光处理、化学腐蚀和滚花等得到不同粗糙度的钢夹片表面,然后对CFRP板-钢夹片界面在20~100MPa的接触压应力下的摩擦行为进行静力张拉试验,分析不同CFRP板厚、钢表面粗糙度和接触压力的CFRP板-钢夹片的摩擦力-滑移曲线和界面磨损情况,得到CFRP板-钢界面的静、滑动摩擦系数。结果表明,短期力学试验条件下静摩擦系数实测值范围为0.11~0.33,滑动摩擦系数较小,范围为0.04~0.31。接触压力作用下钢夹片表面粗糙颗粒对CFRP表面产生的犁沟效应是摩擦力的来源,而随着CFRP板-钢界面磨损量增加,滑移后产生自润滑效应,导致滑动摩擦系数减小。摩擦系数主要取决于CFRP板厚、接触面粗糙度和接触压力的相互匹配,较厚CFRP板具有较大的摩擦系数。The coefficient of static friction of the CFRP-steel couple is a critical parameter required for the prestressed CFRP anchor design.The steel surfaces with different roughness were firstly obtained by polishing,chemical corrosion and knurling to increase the coefficient of static friction as well as anchoring efficient.The friction behavior of CFRP-steel couple were investigated by short-term pull-off static tests with contacting pressure between 20 and 100 MPa.The frictionforce-sliding curves and wear of CFRP-steel couple were investigated under different thickness of CFRP plate,surface roughness of steel and contact pressure.The results show that the static and dynamic friction coefficients are in the range of 0.11-0.33 and 0.04-0.31,respectively.The ploughing effect of the asperity of the rough surface on the CFRP surface was assumed to be the resource of friction force,and the the dynamic friction coefficients in CFRP-steel couple increase with the wearing degree due to the self-lubrication effect.The coefficient of friction primarily depends on the matching of steel roughness level and the contacting pressure applied in the CFRP plates with different thickness,and the thicker CFRP plate can achieve a larger coefficient of friction.

关 键 词：CFRP-钢界面 摩擦系数 粗糙度 接触压力 犁沟效应 

分 类 号：TU391[建筑科学—结构工程]