CFRP布粘贴角度对含裂隙无腹筋梁抗剪加固效果研究  

Study on the shear reinforcement effect of non-stirrup beams with existing cracks using different pasting angles of CFRP fabric

作　　者：郭兴宴 刘文杰 张建成 朱敏 李景龙[3] GUO Xingyan;LIU Wenjie;ZHANG Jiancheng;ZHU Min;LI Jinglong(Jinan Licheng District Engineering Quality and Safety Center,Jinan 250100,China;Yantai Vanke Enterprise Co.,Ltd.,Yantai 264001;School of Civil Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]济南市历城区工程质量与安全中心,山东济南250100 [2]烟台万科企业有限公司,山东烟台264001 [3]山东大学土建与水利学院,山东济南250061

出　　处：《山东建筑大学学报》2024年第6期47-54,共8页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(51879151)。

摘　　要：既有裂隙对无腹筋梁的抗剪承载力有重要影响,研究碳纤维(Carbon Fiber Reinforced Polymer, CFRP)布对含既有裂隙无腹筋梁抗剪加固效果可为实际工程提供理论依据。通过对6组不同工况试件的抗剪性能试验,探究CFRP布不同粘贴角度对试件抗剪性能的影响,分析CFRP布侧面粘贴加固梁的抗剪破坏机理。结果表明:梁侧45°既有裂隙导致无腹筋梁的抗剪承载力降低,破坏时为斜拉、剪切并存的模式;CFRP布的粘贴角度对梁的抗剪加固效果有较大影响,垂直于裂隙的角度加固效果最好,平行于裂隙的角度加固效果最差;CFRP布加固后可有效地抑制斜裂缝的扩展,梁的抗剪能力得到提升,当CFRP布受拉方向与既有裂隙垂直时,极限荷载最大可提升71.2%。The presence of existing cracks has a significant impact on the shear bearing capacity of non-stirrup beams.Investigating the reinforcement effects of Carbon Fiber Reinforced Polymer(CFRP)on non-stirrup beams with pre-existing cracks provides a theoretical basis for practical engineering applications.This study examines the shear performance tests on 6 groups of specimens under different conditions to assess the influence of varying CFRP fabric application angles on the shear strength and analyzes the shear failure mechanism of beams reinforced with side-pasted CFRP fabric.The results indicate that the application angle of CFRP fabric has a significant impact on the shear reinforcement effect of beams.Reinforcement perpendicular to the cracks yields the best performance,while reinforcement parallel to the cracks is the least effective.The pre-existing cracks at the 45°side of the beam weaken the"arch effect"of the beam,reducing its shear bearing capacity and resulting in a combined tension-shear failure mode.The application of CFRP fabric effectively suppresses the propagation of diagonal cracks,enhances the shear performance,and reduces the tensile forces during the loading process.When the longitudinal tensile direction of the CFRP fabric is perpendicular to the pre-existing cracks,the ultimate load capacity can be increased by up to 71.2%.

关 键 词：碳纤维布 无腹筋梁 既有裂隙 抗剪承载力 加固 

分 类 号：TU375.1[建筑科学—结构工程]