AFRP加固钢筋混凝土受损梁抗剪性能试验研究

玻璃钢/复合材料 ›› 2019, Vol. 0 ›› Issue (10): 75-81.

AFRP加固钢筋混凝土受损梁抗剪性能试验研究

邢丽丽, 孔祥清^*, 韩飞, 何文昌

辽宁工业大学土木建筑工程学院,锦州121001

收稿日期:2019-01-14 出版日期:2019-10-28 发布日期:2019-10-28
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。
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。本文作者还有王学志
基金资助:
辽宁省“兴辽英才”支持计划项目(XLYC1807044);辽宁省自然科学基金(SY2016001)

EXPERIMENTAL STUDY ON SHEAR BEHAVIOUR OF REINFORCEDCONCRETE DAMAGED BEAMS REINFORCED BY AFRP

XING Li-li, KONG Xiang-qing^*, HAN Fei, HE Wen-chang

College of Civil & Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, China

Received:2019-01-14 Online:2019-10-28 Published:2019-10-28

摘要/Abstract

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。

关键词: AFRP, 加固, 钢筋混凝土梁, 预损程度, 抗剪性能

Abstract: 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.

Key words: AFRP, strengthening, reinforced concrete beam, degree of damage, shear behaviour

中图分类号:

TB332

邢丽丽, 孔祥清, 韩飞, 何文昌. AFRP加固钢筋混凝土受损梁抗剪性能试验研究[J]. 玻璃钢/复合材料, 2019, 0(10): 75-81.

XING Li-li, KONG Xiang-qing, HAN Fei, HE Wen-chang. EXPERIMENTAL STUDY ON SHEAR BEHAVIOUR OF REINFORCEDCONCRETE DAMAGED BEAMS REINFORCED BY AFRP[J]. Fiber Reinforced Plastics/Composites, 2019, 0(10): 75-81.

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