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

Abstract

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

CLC Number:

TB332

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.

References

[1]周朝阳, 刘君. U形CFRP条带混锚加固混凝土梁抗剪试验. 复合材料学报, 2018, 35(3): 714-721.
[2] Täljsten, Björn. Strengthening concrete beams for shear with CFRP sheets. Construction & Building Materials, 2003, 17(1): 15-26.
[3] 滕锦光, 陈建飞, S.T.史密斯, 等. FRP加固混凝土结构. 李荣, 滕锦光, 顾磊, 译. 北京: 中国建筑工业出版社, 2005.
[4] 周朝阳, 谭磊, 程小念. FRP抗剪加固钢筋混凝土梁研究综述. 建筑科学与工程学报, 2011, 28(2): 1-7.
[5] 刘华新, 柳根金, 孔祥清, 等. 纤维增强复合材料抗剪加固混凝土梁试验研究进展. 科技导报, 2016, 34(2): 94-98.
[6] 卢亦炎. 纤维增强复合材料与钢材复合加固混凝土结构研究进展. 建筑结构学报, 2018(10): 138-146.
[7] 邢丽丽, 孔祥清. 外贴FRP加固钢筋混凝土梁结构性能研究进展. 混凝土, 2018(9): 40-44.
[8] Jayaprakash J, Samad A A, Abbasovich A, et al. Shear capacity of precracked and non-precracked reinforced concrete shearbeams with externally bonded bi-directional CFRP strips. Construction & Building Materials, 2008, 22(6): 1148-1165.
[9] Li W, Leung C K Y. Effect of shear span-depth ratio on mechanical performance of RC beams strengthened in shear with U-wrapping FRP strips. Composite Structures, 2017: S0263822316322243.
[10] 岳清瑞, 杨勇新. 《碳纤维片材加固修复混凝土结构技术规程》(CECSl46∶2003)介绍. 建筑结构, 2003(6): 69-72.
[11] 董江峰, 王清远, 朱艳梅, 等. 外贴纤维布加固钢筋混凝土梁的抗剪试验研究. 工程科学与技术, 2010, 42(5): 197-203.
[12] Abdalla J A, Abu-Obeidah A S, Hawileh R A, et al. Shear strengthening of reinforced concrete beams using externally-bonded aluminum alloy plates: An experimental study. Construction & Building Materials, 2016, 128: 24-37.
[13] 吴刚, 安琳, 吕志涛. 碳纤维布用于钢筋混凝土梁抗剪加固的试验研究. 建筑结构, 2000(7): 16-20, 51.
[14] Al-Tersawy, Sherif H. Effect of fiber parameters and concrete strength on shear behavior of strengthened RC beams. Construction & Building Materials, 2013, 44(3): 15-24.
[15] 秦丽辉, 王宗林. 玄武岩纤维布加固损伤混凝土梁抗剪性能研究. 石家庄铁道大学学报(自然科学版), 2014(2): 12-18.
[16] 任海东, 黄承逵, 赵国藩, 等. 玻璃纤维布加固二次受力钢筋混凝土梁抗剪试验研究. 大连理工大学学报, 2004, 44(3): 425-430.
[17] 张玉成, 徐德新, 段成晓, 等. 碳纤维布加固二次受力钢筋混凝土梁抗剪性能的试验研究. 广东水利水电, 2009(3): 21-25.
[18] Mosallam A S, Banerjee S. Shear enhancement of reinforced concrete beams strengthened with FRP composite laminates. Composites Part B Engineering, 2007, 38(5): 781-793.
[19] Belarbi A, Acun B. FRP systems in shear strengthening of reinforced concrete structures. Procedia Engineering, 2013, 57: 2-8.
[20] Chen G M, Teng J G, Chen J F. Process of debonding in RC beams shear-strengthened with FRP U-strips or side strips. International Journal of Solids and Structures, 2012, 49: 1266-1282.