摘要
对7根芳纶纤维增强复合材料(AFRP)加固钢筋混凝土受损梁的抗剪性能进行了试验研究,研究了不同预损程度、FRP条带间距及FRP类型对抗剪加固效果的影响,并与未加固的混凝土梁进行对比,分析了其特征荷载、破坏形态、荷载-挠度曲线、箍筋及纤维布的荷载-应变曲线。试验结果表明:AFRP加固技术可以有效提高钢筋混凝土梁的抗剪承载力。不同的预损程度对AFRP加固钢筋混凝土受损梁的影响较大,受损程度越大,加固效果越差,当受损程度达到未加固梁极限荷载70%及以上时,粘贴AFRP纤维布加固混凝土梁对抗剪承载力的提高效果较差,甚至加固后无法达到未加固梁的极限承载力,并且AFRP条带粘贴间距越小,加固效果越好。与玄武岩纤维增强复合材料(BFRP)相比,AFRP加固梁的承载力提高程度稍高一些。最后,在理论和试验的基础上,提出了FRP加固钢筋混凝土受损梁抗剪承载力的计算公式。
The experimental study on the shear behaviour of seven concrete damaged beams reinforced by aramid fiber reinforced composite(AFRP),the influence of different levels of damage,FRP strips spacing and different types of FRP on shear capacity were investigated.The characteristic loads,failure modes,beams of load-deflection curves,stirrups and FRP of load-strain curves were analyzed,and compared with reinforced concrete beam without FRP sheets during experimental study.The test result indicated that AFRP reinforcement technology can effectively improve the shear capacity of reinforced concrete beams.Different degrees of damage have a great influence on the reinforced concrete damaged beams strengthened by AFRP,and increasing level of damage can reduce the reinforcement effect.When the level damage reaches the ultimate load of the concrete beam without FRP 70%and above,the improvement effect of the shear capacity of FRP reinforced concrete beam is not obvious,which even can′t reach the ultimate shear capacity of the reinforced concrete beam without FRP sheets.And it is found that the smaller the spacing of the FRP strips,the better the reinforcement effect.In addition,it is found that the shear capacity of reinforced concrete beams with AFRP is slightly higher compared with the test result of the reinforced concrete beam with BFRP.According to the test results,the shear capacity formula of reinforced concrete damaged beams strengthened with FRP is obtained,and it showed good agreement with the experimental results.
作者
邢丽丽
孔祥清
韩飞
何文昌
王学志
XING Li-li;KONG Xiang-qing;HAN Fei;HE Wen-chang(College of Civil&Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China)
出处
《玻璃钢／复合材料》
CAS
北大核心
2019年第10期75-81,共7页
Fiber Reinforced Plastics/Composites
基金
辽宁省“兴辽英才”支持计划项目(XLYC1807044)
辽宁省自然科学基金(SY2016001)
关键词
AFRP
加固
钢筋混凝土梁
预损程度
抗剪性能
AFRP
strengthening
reinforced concrete beam
degree of damage
shear behaviour
作者简介
邢丽丽(1992-),女,硕士研究生,主要从事结构力学性能方面的研究;通讯作者:孔祥清(1982-),女,博士,教授,主要从事新型材料及结构力学性能方面的研究,xqkong@lnut.edu.cn。
