|本期目录/Table of Contents|

[1]钟正强,王贺龙,刘卓泽,等.FRP-ECM加固RC梁二次受力抗剪性能试验[J].建筑科学与工程学报,2024,41(06):79-88.[doi:10.19815/j.jace.2023.02002]
　ZHONG Zhengqiang,WANG Helong,LIU Zhuoze,et al.Experiment on shear performance of RC beams strengthened with FRP-ECM under secondary load[J].Journal of Architecture and Civil Engineering,2024,41(06):79-88.[doi:10.19815/j.jace.2023.02002]
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FRP-ECM加固RC梁二次受力抗剪性能试验(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
41卷
期数:
2024年06期
页码:
79-88
栏目:
建筑结构
出版日期:
2024-11-30

文章信息/Info

Title:
Experiment on shear performance of RC beams strengthened with FRP-ECM under secondary load
文章编号:
1673-2049(2024)06-0079-10
作者:
钟正强1,2,王贺龙1,刘卓泽1,刘 珺1
(1. 长沙理工大学 土木工程学院,湖南 长沙 410114; 2. 长沙理工大学 桥梁结构安全控制湖南省工程实验室,湖南 长沙 410114)
Author(s):
ZHONG Zhengqiang1,2, WANG Helong1, LIU Zhuoze1, LIU Jun1
(1. School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, Hunan, China; 2. Hunan Province Engineering Laboratory for Safety Control of Bridge Structures, Changsha University of Science & Technology, Changsha 410114, Hunan, China)
关键词:
钢筋混凝土梁;  抗剪性能;  静载试验;  FRP网格;  二次受力
Keywords:
reinforced concrete beam;  shear performance;  static load test;  FRP grid;  secondary load
分类号:
TU375.1
DOI:
10.19815/j.jace.2023.02002
文献标志码:
A
摘要:
为研究纤维增强复合材料(FRP)刚性网格-环氧水泥砂浆(ECM)复合加固钢筋混凝土(RC)梁二次受力抗剪性能,以预载幅值、FRP网格尺寸及网格布置范围为参数,对7根二次受力RC梁进行四点弯曲静载试验,观察各试验梁的裂缝发展过程,分析跨中挠度、箍筋应变和FRP网格应变变化,基于桁架-拱理论模型,引进预损伤影响系数,对FRP刚性网格-ECM加固梁二次受力进行斜截面抗剪承载力计算。结果表明:与未加固梁相比,加固梁极限荷载下跨中挠度、主斜裂缝形成荷载和极限荷载最大提高幅度分别为28.0%、37.0%和22.5%; 与无预载加固梁相比,随着预载幅值的增加,加固梁弯剪区斜裂缝发展增快且加固层剥离破坏荷载最大降低幅度为8.7%; 与预载幅值为40%Pu的加固梁相比,预载幅值为60%Pu、80%Pu的加固梁FRP网格进入抗剪状态时的荷载分别降低了200、270 kN; 采用100 mm网格间距加固和弯剪区横贴加固的方式使斜截面开裂荷载分别提高了22.2%、14.8%; FRP刚性网格-ECM加固RC梁能有效抑制斜裂缝扩展,改善剪切破坏时的延性; 提出的抗剪承载力计算公式的计算结果与试验结果吻合较好,可以有效预测FRP刚性网格-ECM加固RC梁二次受力的抗剪承载力。
Abstract:
In order to study the effect of secondary load on the shear performance of reinforced concrete(RC)beam strengthened with fiber reinforced polymer(FRP)rigid grid-epoxy cement mortar(ECM)composite, a four-point bending static load test was carried out on seven RC beams under secondary load, and the pre-loading amplitude, FRP grid size and grid arrangement range were taken as parameters. The crack development process of each test beam was observed, and the mid-span deflection, stirrup strain and FRP grid strain were analyzed. Based on the truss-arch theoretical model, the pre-damage influence coefficient was introduced to calculate the oblique shear capacity of the FRP rigid grid-ECM reinforced beam. The results show that compared with the unreinforced beam, the maximum increases of mid-span deflection, main inclined crack formation load and ultimate load of the reinforced beam under ultimate load are 28.0%, 37.0% and 22.5%, respectively. Compared with the reinforced beam without preload, with the increase of preload amplitude, the development of inclined cracks in the bending shear zone of the reinforced beam is faster and the maximum reduction of the peeling failure load of the reinforced layer is 8.7%. Compared with the strengthened beam with a preload amplitude of 40%Pu, the load of the FRP grid of the strengthened beam with a preload amplitude of 60%Pu and 80%Pu is reduced by 200 kN and 270 kN respectively when the FRP grid enters the shear state. The cracking load of the inclined section is increased by 22.2% and 14.8% respectively by 100 mm grid spacing reinforcement and bending shear zone transverse reinforcement. The RC beam reinforced with FRP rigid grid-ECM can effectively inhibit the propagation of oblique crack and improve the ductility during shear failure. The calculation results of the proposed shear capacity calculation formula are in good agreement with the experimental results, which can effectively predict the shear capacity of RC beams strengthened with FRP rigid grid-ECM under secondary loading.

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备注/Memo

备注/Memo:
收稿日期:2023-02-05 投稿网址:http://jace.chd.edu.cn
基金项目:国家自然科学基金项目(52178186)
作者简介:钟正强(1968-),男,工学博士,副教授,E-mail:zzq6010@sina.com。
Author resume: ZHONG Zhengqiang(1968-),male,PhD,associate professor,E-mail:zzq6010@sina.com.
更新日期/Last Update: 2024-12-10