(1 华北水利水电大学土木与交通学院, 郑州 450045; 2 河南农业大学基建处, 郑州 450002)

摘要: 通过对 3 根钢筋混凝土短梁进行抗弯性能试验,研究了普通 RC 短梁、CFRP 布加固未损伤及损伤 RC短梁的破坏形态、混凝土应变、抗弯承载力、挠度变形、曲率和抗弯刚度的变化规律. 试验研究结果表明:1)CFRP 布加固未损伤及损伤 RC 短梁的极限破坏特征一致,都是 CFRP 布部分拉断破坏;2) CFRP 布加固未损伤及损伤 RC 短梁的跨中截面混凝土应变均近似符合平截面假定;3) CFRP 布加固未损伤及损伤 RC 短梁的荷载-挠度曲线分别为三阶段和两阶段特征,加固损伤 RC 短梁没有开裂阶段曲线;4) 采用 CFRP 布加固损伤RC 短梁比加固未损伤 RC 短梁更能提高原试件的极限承载力;5) CFRP 布加固损伤 RC 短梁比加固未损伤RC 短梁的延性更好.

关键词: CFRP 布加固; 钢筋混凝土; 短梁; 损伤荷载; 受弯试验

中图分类号:TU375. 1 文献标志码:A 文章编号:1002-848X(2023)12-0080-07

DOI:10. 19701 / j. jzjg. LS220152

Experimental study on flexural performance of damaged RC short beams reinforced by CFRP sheets

WANG Tingyan1, WU Yuxiang1, ZHAO Shunbo1, ZHANG Junwei2

(1 School of Civil Engineering and Communication, North China University of Water Resources and Electric Power,Zhengzhou 450045, China; 2 Capital Construction Department, Henan Agricultural University, Zhengzhou 450002, China)

Abstract: Based on the flexural performance tests on three reinforced concrete short beams, the failure modes, concretestrain, flexural bearing capacity, deflection deformation, curvature and flexural stiffness of ordinary RC short beams,undamaged short beams reinforced with CFRP sheets and damaged RC short beams reinforced with CFRP sheets werestudied. The experimental research results indicate that: 1) The ultimate failure characteristics of two CFRP sheetsreinforced RC short beams are consistent, both of which are partial tensile failure of CFRP sheets; 2) The strain of theconcrete in the mid-span section of two CFRP sheets reinforced RC short beams is approximately consistent with theassumption of a flat section; 3) The load-deflection curve of CFRP sheets reinforced undamaged short beams is in threestages, while the load-deflection curve of CFRP sheets reinforced damaged RC short beams is in two stages. There is nocracking stage in the CFRP sheets reinforced damaged RC short beams; 4) CFRP sheets reinforced damaged RC shortbeams can improve the ultimate bearing capacity of the original specimen more effectively than CFRP sheets reinforcedundamaged RC short beams; 5) The ductility of CFRP sheets reinforced damaged RC short beams is better than that ofCFRP sheets reinforced undamaged RC short beams.

Keywords:CFRP sheet reinforcement; reinforced concrete; short beam; damage load; flexural test

∗河南省 自 然 科 学 青 年 基 金 项 目 ( 212300410193 ), 中 国 地 震 局 工 程 力 学 研 究 所 基 本 科 研 业 务 费 专 项 资 助 项 目(2020EEEVL0411).

第一作者:王廷彦,博士,讲师,一级注册结构工程师,主要从事结构加固及抗震性能研究,Email:124466715@ qq. com.

[引用本文] 王廷彦,吴玉祥,赵顺波,等. CFRP 布加固损伤 RC 短梁受弯性能试验研究[ J]. 建筑结构,2023,53(12):80-86. WANG Tingyan,WU Yuxiang,ZHAO Shunbo,et al. Experimental study on flexural performance of damagedRC short beams reinforced by CFRP sheets[J]. Building Structure,2023,53(12):80-86.