碳纤维复材筋增强混凝土梁受剪性能试验研究  

Experimental study on shear behavior of concrete beams reinforced with CFRP tendons

作　　者：陈科 张春涛[1] 王磊[1] Chen Ke;Zhang Chuntao;Wang Lei(Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南科技大学,四川绵阳621010

出　　处：《建筑科学》2019年第1期57-63,共7页Building Science

基　　金：国家自然科学基金资助项目(51508482);"十二五"农村领域国家科技支撑计划课题(2015BAL03B03)

摘　　要：为研究碳纤维复材(CFRP)筋增强混凝土梁的受剪性能,以配箍率和剪跨比为试验变量,进行了3根两点集中荷载作用下的CFRP筋简支梁受剪试验,对CFRP筋梁的裂缝发展、破坏形态、斜向开裂荷载、跨中挠度、受剪承载力等进行了观察和测量。试验结果表明:CFRP筋梁的剪切破坏由贯通斜裂缝所致,配箍率和剪跨比对斜向开裂荷载和极限承载力影响显著。将本次试验值与我国《纤维增强复合材料建设工程应用技术规范》(GB 50608-2010)、美国规范ACI 440. 1R-06和英国规范BISEI-1999规范的计算值进行对比分析,结合此次试验结果和国内外搜集的70组已有试验数据,对我国GB 50608-2010的受剪承载力计算公式的准确性和安全性进行探讨,提出了一种计算CFRP筋梁抗剪承载力的建议公式。In order to investigate the shear behavior of reinforced concrete( RC) beams with CFRP tendons,3 simply supported beams are tested to shear failure under two points load. The main variables in the test are shear span-to-depth ratio and stirrup ratio. The development of crack,failure pattern,diagonal cracking load,beam deflection in the middle span,as well as ultimate shear strength are observed and measured. The experimental study shows that the diagonal cracking load and ultimate shear strength are significant influenced by shear span-to-depth ratio and stirrup ratio. The test shear strength of RC beams with CFRP tendons is compared with the predictions of GB50608-2010,ACI 440. 1 R-06 and BISEI-1999. By comparing the test results in this study and 76 beams collected from literature,the shear strength equation of GB50608-2010 is evaluated. Finally,a new equation for shear strength of reinforced concrete beams with CFRP tendons is proposed.

关 键 词：碳纤维复材筋混凝土梁 受剪承载力 裂缝 静力试验 

分 类 号：TU528.582[建筑科学—建筑技术科学]