CFRP加固钢筋混凝土T形梁抗剪性能试验研究  

Shear Behaviors of Reinforced Concrete T-beam Strengthened with CFRP Sheets

作　　者：石风俊[1] 李军锋[1] 曲福来[1] 杜中华[1] 

机构地区：[1]华北水利水电大学土木与交通学院,河南郑州450045

出　　处：《华北水利水电学院学报》2013年第4期57-60,共4页North China Institute of Water Conservancy and Hydroelectric Power

基　　金：国家自然科学基金(51108179);生态建筑材料河南省高校重点实验室培育基地项目(豫教科外[2009]609号)

摘　　要：制作了5根钢筋混凝土T形梁,经过预裂模拟梁在受荷后的实际状况,采用粘贴碳纤维布(CFRP)方法对其进行加固,研究了U形箍宽度对加固效果的影响.分析了试验梁的斜裂缝宽度、位移、碳纤维布的应变和抗剪极限承载力.结果表明:CFRP有效约束了加固梁的裂缝开展,提高了梁的抗剪承载力;受粘贴效果和U形箍锚固效果的影响,抗剪承载力的提高并不与宽度的增加成比例.Five reinforced concrete T-beams were cast and pre-cracked to simulate the real state under loads,and then strengthened with U-stirrups and longitudinal sheets of CFRP in different width.The strengthening effects of U-stirrups were studied,and the development of diagonal crack,mid-span deflection,CFRP strain and ultimate shear resistance of the beams were analyzed.The results showed that the CFRP sheets effectively restrained the development of cracks and enhanced the shear resistances of the beams.Due to effects of bond quality and anchorage reliability of the U-stirrups on the shear resistance,the increment of shear resistance was not in direct proportion with the increase of the width of CFRP sheets.

关 键 词：钢筋混凝土T形梁 预裂 加固 碳纤维布 抗剪承载力 

分 类 号：TV332[水利工程—水工结构工程]