芯钢管连接的PVC-CFRP管混凝土柱-RC梁边节点抗裂承载力研究  

Research on crack resistance capacity of RC beam to PVC-CFRP confined concrete column exterior joint with core steel tube

作　　者：于峰 谈嗣勇[2] 鲍海英 郭卫东 管玉聪 赵鲁卿 YU Feng;TAN Siyong;BAO Haiying;GUO Weidong;GUAN Yucong;ZHAO Luqing(State Key Laboratory of Building Safety and Environment,Beijing 101100,China;College of Civil Engineering,Anhui University of Technology,Ma′anshan 243000,China;National Engineering Research Center of Building Technology,Beijing 101100,China;Anhui Masteel Jiahua New Building Materials Co.,Ltd.,Ma′anshan 243000,China)

机构地区：[1]建筑安全与环境国家重点实验室,北京101100 [2]安徽工业大学建筑工程学院,安徽马鞍山243000 [3]国家建筑工程技术研究中心,北京101100 [4]安徽马钢嘉华新型建材有限公司,安徽马鞍山243000

出　　处：《地震工程与工程振动》2023年第2期136-145,共10页Earthquake Engineering and Engineering Dynamics

基　　金：建筑安全与环境国家重点实验室暨国家建筑工程技术研究中心开放课题基金项目(BSBE2020-4);国家自然科学基金项目(51208001);安徽省杰出青年科学基金项目(2008085J29);安徽省高校自然科学研究项目(YJS20210351);安徽工业大学芜湖技术创新研究院应用基础研究项目(2022jc04)。

摘　　要：为研究芯钢管连接的PVC-CFRP管混凝土柱-RC梁边节点的抗裂性能,文中以芯钢管含钢率、节点配箍率、轴压比、梁纵筋配筋率和CFRP条带间距为设计参数,对11根节点试件进行低周反复荷载试验,观察其裂缝发展过程,分析各参数对其初裂荷载的影响。试验结果表明:节点在加载过程中先后经历了初裂、通裂、峰值和破坏阶段,初裂荷载约为极限荷载的40%~50%,随着节点核心区表面斜裂缝的出现,试件荷载-位移滞回曲线逐渐偏离线性。与普通节点相比,内置芯钢管可有效提高节点的初裂荷载,同时,随着节点配箍率和轴压比增加,节点初裂荷载有所提高,芯钢管含钢率、梁纵筋配筋率以及CFRP条带间距对节点初裂荷载影响不明显。最后,基于节点核心区的受力分析,引入节点箍筋影响系数,提出节点抗裂承载力计算公式,与试验值吻合良好,此外,与目前已有节点抗裂承载力计算模型对比,文中公式更适用于芯钢管节点抗裂设计。To study the crack resistance capacity of RC beam to PVC-CFRP confined concrete column exterior joint with core steel tube,eleven joint specimens are tested under low cyclic loading,with the steel ratio of core steel tube,reinforcement ratio of the frame beam,axial compression ratio,stirrup ratio of the joint and CFRP strips spacing as the design parameters.The whole crack process is observed,and the impacts of various parameters on the initial crack loads are analyzed.The test results show that the joins experience the initial crack,through crack,peak and failure stage successively,the initial crack load is approximately 40%to 50%of the ultimate strength,and the load-displacement hysteretic curves of the specimens gradually deviate from linearity with the appearance of oblique cracks on the joint core.Compared with the ordinary joint,the initial crack load of the joints can be effectively improved by strengthened with core steel tube.Meanwhile,the crack resistance capacity of the joint increases with the increase in the axial compression ratio and stirrup ratio of the joint,and the steel ratio of core steel tube,reinforcement ratio of the frame beam and CFRP strips spacing have no significant effect on the initial crack load.Finally,based on the force analysis of the joint core,the influence coefficient of the joint stirrups is introduced,and the calculation formula of the crack resistance capacity is proposed,which is in good agreement with the test values.Furthermore,the comparison between the established calculation model is developed,the formula in this paper is more applicable to the crack resistance design for the joint with core steel tube.

关 键 词：PVC-FRP约束混凝土 梁柱节点 芯钢管 抗裂承载力 

分 类 号：TU375.4[建筑科学—结构工程]