碳纤维增强复合材料条带箍筋混凝土梁剪切疲劳性能试验研究  

Experimental Research on Shear Fatigue Performance of Concrete Beams Reinforced with CFRP Strip Stirrups

作　　者：丁小波[1] 吴美仲 方五军 袁方[1] 郭世杰 李伟文[1] 唐仕盈 DING Xiaobo;WU Meizhong;FANG Wujun;YUAN Fang;GUO Shijie;LI Weiwen;TANG Shiying(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China;Central Research Institute of Building and Construction(Shenzhen)Co.,Ltd.,MCC Group,Shenzhen 518055,China)

机构地区：[1]深圳大学土木与交通工程学院,广东深圳518060 [2]中冶建筑研究总院(深圳)有限公司,广东深圳518055

出　　处：《工业建筑》2023年第6期202-208,42,共8页Industrial Construction

基　　金：国家自然科学基金项目(51878415);深圳市科技计划面上项目(JCYJ20220531101415036);稳定支持B类项目(20220811100052001)。

摘　　要：为探究使用碳纤维增强复合材料(CFRP)条带替代钢箍筋的混凝土梁剪切疲劳性能,对4根CFRP条带箍筋混凝土梁和2根普通钢箍筋混凝土梁进行了等幅疲劳试验,研究剪跨比(a/d=1.0、2.5)和CFRP条带箍筋配置方式对混凝土梁剪切疲劳性能的影响。结果表明:CFRP条带箍筋梁的疲劳寿命远高于钢筋混凝土梁;等幅疲劳加载条件下,CFRP条带箍筋梁在经历大于200万次的循环荷载后仍未破坏。此外,CFRP条带箍筋梁在残余挠度及箍筋应变方面相较于钢箍筋混凝土梁表现更加优异。基于已有的剪切破坏理论和桁架-拱模型对循环荷载下CFRP条带箍筋最大应变进行预测,计算结果与试验值较为符合。因此,使用CFRP条带箍筋替代普通钢箍筋可以有效提高混凝土梁在疲劳载荷下的抗剪能力。In order to study the shear fatigue performance of concrete beams using CFRP strips instead of steel stirrups,constant-amplitude fatigue experiment was carried out on 4 concrete beams reinforced with CFRP strip stirrups and 2 concrete beams with steel stirrups.The effects of shear-span ratio(a/d=1.0,2.5) and the configuration way of CFRP strips on the shear fatigue performance of the concrete beams were investigated.The results showed that the fatigue life of beams with CFRP strip stirrups was much higher than that of reinforced concrete beams,the beams with CFRP strip stirrups were not damaged after being subjected to more than 2 million cycles of cyclic loading under equal-amplitude fatigue loading conditions.Moreover,compared with the reinforced concrate beams,the residual deflection and stirrup strain of the beams reinforced with CFRP strip stirrups showed a better performance.Based on the existing shear damage theory and the truss-arch model,the maximum strain of CFRP strip stirrups under cyclic loading was predicted,and results were in good agreement with the test data.Therefore,using CFRP strip stirrups instead of ordinary steel stirrups could effectively improve the shear resistance of concrete beams under fatigue loading.

关 键 词：疲劳性能 剪切性能 CFRP 混凝土梁 箍筋 

分 类 号：TU377[建筑科学—结构工程]