GFRP带肋筋黏结性能试验研究  

Experimental Study on Bond Property of GFRP Ribbed Bars

作　　者：宋金华 史鹏 

机构地区：[1]河北工业大学土木与交通学院,天津300401

出　　处：《重庆交通大学学报（自然科学版）》2018年第1期1-9,共9页Journal of Chongqing Jiaotong University(Natural Science)

摘　　要：采用拉拔试验,研究GFRP带肋筋与混凝土的黏结性能,分析GFRP带肋筋与混凝土黏结强度影响因素及相应的受力破环特征,确定GFRP带肋筋最佳外形,建立GFRP带肋筋与混凝土的黏结-滑移本构模型。研究结果表明:在GFRP带肋筋混凝土构件的拉拔试验中会出现筋的剪切滞后现象,GFRP带肋筋的黏结强度随筋直径的增大而减小。同时在凸肋和混凝土之间发生楔块效应,GFRP带肋筋凸肋的参数,如肋间距、肋高度等都对GFRP带肋筋的黏结性能有很大影响。GFRP筋的最佳肋间距/直径为1;GFRP带肋筋的最佳肋高度/直径为0.06,对以后GFRP带肋筋的生产及实际应用提供参考依据。新建的黏结-滑移本构模型能较好地反映GFRP带肋筋受力全过程。Bonding properties of GFRP ribbed bars and concrete were studied by the pullout test. The factors affecting the bond strength of GFRP with rib and concrete as well as the corresponding stress rupture characteristics were analyzed. The optimum shape of GFRP ribbed bar was determined,and bond-slip constitutive model of GFRP ribbed bars and concrete was established. The research results show that the shear lag phenomenon occurs in the pull-out test of GFRP ribbed concrete members,and the bond strength of GFRP ribbed bars decreases with the increase of the reinforcement diameter. At the same time,the wedge effect occurs between the convex rib and concrete. The parameters of GFRP convex ribbed bars,such as the rib spacing and the rib height,have a great influence on the bond performance of GFRP ribbed bars. The optimum rib spacing/diameter of GFRP bars is 1; and the optimum rib height/diameter of GFRP ribbed bar is 0. 06,which provides a reference for the production and practical application of GFRP ribbed bars. The proposed bond-slip constitutive model can well reflect the whole stress process of GFRP ribbed bars.

关 键 词：桥梁工程 玻璃钢筋 混凝土 拉拔试验 黏结性能 

分 类 号：U444[建筑科学—桥梁与隧道工程]