|Table of Contents|

Experimental study on impact resistance of damaged reinforced concrete beams strengthened with CFRP(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2024年02期
Page:
66-74
Research Field:
建筑结构
Publishing date:

Info

Title:
Experimental study on impact resistance of damaged reinforced concrete beams strengthened with CFRP
Author(s):
YU Wencheng1;  LIU Lang1;  LIU Junli1;  LI Zhi1;  LEI Yun1;  LIN Tong2
(1. College of Civil and Architecture Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China; 2. College of Civil Engineering, Minnan University of Science and Technology, Quanzhou 362700, Fujian, China)
Keywords:
CFRP;  reinforced concrete beam;  reinforcement and repair;  drop hammer impact;  dynamic response;  impact resistance
PACS:
TU375.1
DOI:
10.19815/j.jace.2022.01016
Abstract:
The drop hammer impact tests were carried out on reinforced concrete beams with different damage degrees strengthened with carbon fiber reinforced polymer(CFRP). Taking the impact height and the number of reinforcement layers as the test parameters, the crack development, failure mode and impact resistance of the damaged specimens strengthened with CFRP were analyzed and the dynamic performance of the specimens under impact load was studied. The results show that the higher the damage degree of the specimen, the denser the oblique crack development and the more serious the damage degree of the specimen. The higher the drop hammer impact height is, the closer the crack development is to the mid-span localization. When the damaged specimens are strengthened with multi-layer CFRP sheets, the specimens maintain good integrity under the impact of drop hammer, and only the external concrete is crushed and dropped. With the increase of the number of CFRP layers, the whole specimen produces bending and shear failure. Compared with the unreinforced specimen, the impact resistance and stiffness of the damaged beams are significantly improved with the increase of the number of CFRP layers, and the improvement amplitude is 70%-72%. However, increasing the number of CFRP layers has limited effect to improve the reinforcement and repair effect of the specimen, and the reinforcement effect is not linearly related to the impact resistance. Based on the results of effective strain calculation, it can be seen that the use of CFRP reinforcement not only has the role of reinforcement, but also can improve the overall impact resistance of the specimen to a certain extent.

References:

[1] 韩建平,何梁华.CFRP加固震损钢筋混凝土框架结构的抗整体性倒塌能力分析[J].世界地震工程,2020,36(1):8-16.
HAN Jianping,HE Lianghua.Global collapse resistance capacity analysis on earthquake-damaged reinforced concrete frame structures retrofitted with CFRP[J].World Earthquake Engineering,2020,36(1):8-16.
[2]FU H C,ERKI M A,SECKIN M.Review of effects of loading rate on concrete in compression[J].Journal of Structural Engineering,1991,117(12):3645-3659.
[3]MALVAR L J,ROSS C A.Review of strain rate effects for concrete in tension[J].ACI Materials Journal,1998,95(6):735-739.
[4]MYLREA T D.Effect of impact on reinforced concrete beams[J].ACI Journal Proceedings,1940,36(6):581-594.
[5]SUARIS W,SHAH S P.Properties of concrete subjected to impact[J].Journal of Structural Engineering,1983,109(7):1727-1741.
[6]曾 翔,许 斌.无腹筋钢筋混凝土梁抗冲击行为试验研究[J].土木工程学报,2012,45(9):63-73.
ZENG Xiang,XU Bin.Experimental study on the impact-resistant behavior of RC beams without shear-resistant rebar[J].China Civil Engineering Journal,2012,45(9):63-73.
[7]何庆锋,岳泪阳,毛佳伟.冲击作用下CFRP修复损伤RC叠合梁动力性能试验研究[J].振动与冲击,2021,40(4):171-178.
HE Qingfeng,YUE Leiyang,MAO Jiawei.An experimental study on dynamic performance of CFRP-repaired RC composite beams under impact[J].Journal of Vibration and Shock,2021,40(4):171-178.
[8]TANG T,SAADATMANESH H.Behavior of concrete beams strengthened with fiber-reinforced polymer laminates under impact loading[J].Journal of composites for construction,2015,7(3):209-218.
[9]SOLEIMANI S M.Sprayed glass fiber reinforced polymers in shear strengthening and enhancement of impact resistance of reinforced concrete beams[D].Vancouver:The University of British Columbia,2006.
[10]PHAM T,HAO H.Impact behavior of FRP-strengthened RC beams without stirrups[J].Journal of Composites for Construction,2016,20:04016011.
[11]GOLDSTON M W,REMENNIKOV A M,SHEIKH M N.Experimental study on the effectiveness of CFRP strengthening of shear-deficient reinforced concrete beams under impact loading[C]∥SMITH S T.Proceedings of the 23rd Australasian Conference on the Mechanics of Structures and Materials(ACMSM23).Byron Bay:ACMSM,2014:427-434.
[12]许 斌,曾 翔.冲击荷载作用下钢筋混凝土梁性能试验研究[J].土木工程学报,2014,47(2):41-51,61.
XU Bin,ZENG Xiang.Experimental study on the behaviors of reinforced concrete beams under impact loadings[J].China Civil Engineering Journal,2014,47(2):41-51,61.
[13]SAATCI S,VECCHIO F.Effects of shear mechanisms on impact behavior of reinforced concrete beams[J].ACI Structural Journal,2009,106(1):78-86.
[14]CHEN Y,MAY I M.Reinforced concrete members under drop-weight impacts[J].Structures and Buildings,2009,162(1):45-56.
[15]KISHI N,MIKAMI H,MATSUOKA K G,et al.Impact behavior of shear-failure-type RC beams without shear rebar[J].International Journal of Impact Engineering,2002,27(9):955-968.
[16]KISHI N,NAKANO O,MATSUOKA K G,et al.Experimental study on ultimate strength of flexural-failure-type RC beams under impact loading[C]// IASMiRT.Transactions of the 16th International Conference on Structural Mechanics in Reactor Technology.Washington DC:IASMiRT,2001:1-7.
[17]混凝土结构加固设计规范:GB 5036—2006[S].北京:中国建筑工业出版社,2006.
Design code for strengthening concrete structure:GB 50367—2006[S].Beijing:China Architecture & Building Press,2006.
[18]纤维增强复合材料建设工程应用技术规范:GB 50608—2010[S].北京:中国计划出版社,2011.
Technical code for infrastructure application of FRP composites:GB 50608—2010[S].Beijing:China Planning Press,2011.
[19]Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures:440.2R-17[S].Reston:American Concrete Institute,2017.

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Last Update: 2024-03-25