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(1 華北水利水電大學(xué)土木與交通學(xué)院, 鄭州 450045; 2 河南農(nóng)業(yè)大學(xué)基建處, 鄭州 450002)

摘要: 通過(guò)對(duì) 3 根鋼筋混凝土短梁進(jìn)行抗彎性能試驗(yàn),研究了普通 RC 短梁、CFRP 布加固未損傷及損傷 RC短梁的破壞形態(tài)、混凝土應(yīng)變、抗彎承載力、撓度變形、曲率和抗彎剛度的變化規(guī)律. 試驗(yàn)研究結(jié)果表明:1)CFRP 布加固未損傷及損傷 RC 短梁的極限破壞特征一致,都是 CFRP 布部分拉斷破壞;2) CFRP 布加固未損傷及損傷 RC 短梁的跨中截面混凝土應(yīng)變均近似符合平截面假定;3) CFRP 布加固未損傷及損傷 RC 短梁的荷載-撓度曲線分別為三階段和兩階段特征,加固損傷 RC 短梁沒(méi)有開(kāi)裂階段曲線;4) 采用 CFRP 布加固損傷RC 短梁比加固未損傷 RC 短梁更能提高原試件的極限承載力;5) CFRP 布加固損傷 RC 短梁比加固未損傷RC 短梁的延性更好.

關(guān)鍵詞: CFRP 布加固; 鋼筋混凝土; 短梁; 損傷荷載; 受彎試驗(yàn)

中圖分類(lèi)號(hào):TU375. 1 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):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 學(xué) 青 年 基 金 項(xiàng) 目 ( 212300410193 ), 中 國(guó) 地 震 局 工 程 力 學(xué) 研 究 所 基 本 科 研 業(yè) 務(wù) 費(fèi) 專(zhuān) 項(xiàng) 資 助 項(xiàng) 目(2020EEEVL0411).

第一作者:王廷彥,博士,講師,一級(jí)注冊(cè)結(jié)構(gòu)工程師,主要從事結(jié)構(gòu)加固及抗震性能研究,Email:124466715@ qq. com.

[引用本文] 王廷彥,吳玉祥,趙順波,等. CFRP 布加固損傷 RC 短梁受彎性能試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),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.