基于黏结滑移内聚力模型的纤维增强材料网格加固混凝土梁弯曲承载力计算

胡文豪; 郭瑞; 任宇

doi:10.13204/j.gyjzG21062512

基于黏结滑移内聚力模型的纤维增强材料网格加固混凝土梁弯曲承载力计算

doi: 10.13204/j.gyjzG21062512

胡文豪^1,2,
郭瑞^2, ,,
任宇²

1. 中国电建成都勘测设计研究院有限公司, 成都 610072;
2. 西南交通大学土木工程学院, 成都 610031

基金项目:

国家自然科学基金项目(52008350)。

详细信息

作者简介:
胡文豪,男,1995年出生,硕士,工程师。

通讯作者:
郭瑞,guor4867@swjtu.edu.cn。

计量
- 文章访问数: 82
- HTML全文浏览量: 16
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-25

Study on the Flexural Capacity of RC Beams Strengthened with FRP Grids Based on the Bond-Slip Cohesive Model

HU Wenhao^1,2,
GUO Rui^{2
, ,},
REN Yu²

1. Power China Chengdu Engineering Corporation Limited, Chengdu 610072, China;
2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 为深入研究纤维增强复材(FRP)网格-水泥基材复合加固钢筋混凝土(RC)梁的抗弯性能,对完成试验的5根梁试件进行有限元建模,并引入黏结滑移内聚力模型单元,重点分析了受弯破坏时复合层与RC梁的界面损伤演化机理。以FRP网格单位加固量和RC梁配筋率为导向,建立多个参数化有限元模型进行对比分析,最终提出基于黏结滑移内聚力模型的FRP网格加固RC梁弯曲承载力改良计算模型,并依据相关文献验证计算模型正确性和适用性。研究结果表明:基于黏结滑移内聚力模型单元建立的有限元模型能够有效拟合试验过程与试验结果;复合层与RC梁的界面损伤由剪跨段出现并沿着网格方向发展至支座处,最终同时损伤导致界面破坏;网格单位加固量与配筋率对RC梁弯曲承载力影响较大,网格单位加固量与发生剥离破坏时跨中网格应变呈负相关,配筋率对发生剥离破坏时跨中网格应变影响较小;提出的FRP网格加固RC梁弯曲承载力改良计算模型是正确并适用的,能够较好地预测加固试件的弯曲承载力和跨中网格应变。
- FRP网格 /
- 钢筋混凝土梁 /
- 有限元分析 /
- 黏结滑移 /
- 弯曲承载力
Abstract: In order to study the flexural behavior of concrete beams strengthened by fiber reinforced polymer (FRP) grid and cement substrate, 5 tested specimens were estabilshed finite element model with bond-slip cohesive element. The damage evolution mechanism in the interface between the FRP mesh-cement substrate layer and the RC beam during bending failure was analyzed. Parametric finite element models were established guided by the grid unit reinforcement and the beam reinforcement ratio. An improved calculation model for flexural bearing capacity about FRP grid reinforced RC beams based on the bond-slip cohesive model was proposed, and the correctness and applicability of the calculation model were verified by some references. The research indicated that finite element model established by the bond-slip cohesive model could effectively fit the test process and results. The interface damage between the composite layer and the RC beam appearred from the shear span and developed along the direction of the grid. The unit reinforcement amount and reinforcement ratio had great influence on the bending capacity of RC beam. The improved calculation model was correct and applicable, and could better predict the flexural bearing capacity of reinforced specimens and the meshed-span strain.
- FRP grid /
- reinforced concrete beam /
- finite element analysis /
- bond-slip /
- flexural capacity

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参考文献(18)

[1]	叶列平,冯鹏.纤维增强复合材料在工程结构中的应用与发展[J].土木工程学报,2006,39(3):25-37.
[2]	王文炜,黄辉,赵飞.湿技术条件下GFRP板-混凝土界面黏结性能试验研究[J].土木工程学报,2015,48(3):52-60.
[3]	GUO R,REN Y,LI M Q,et al.Experimental study on flexural shear strengthening effect on low-strength RC beams by using FRP grid and ECC[J].Engineering Structures,2021,227:1-11.
[4]	张峰,徐向锋,李术才.HB-FRP加固RC梁的精细有限元分析[J].哈尔滨工业大学学报,2015,47(8):125-128.
[5]	郑宇宙.FRP格栅增强ECC复合加固混凝土梁试验与计算方法研究[D].南京:东南大学,2018.
[6]	BARRENBLATT G I.The formation of equilibrium cracks during brittle fracture:general ideas and hypotheses,axially-symmetric cracks[J].Journal of Applied Mathematics and Mechanics,1959,23(3):622-636.
[7]	陆新征.FRP-混凝土界面行为研究[D].北京:清华大学,2005.
[8]	刘学毅,苏成光,刘丹,等.轨道板与砂浆黏结试验及内聚力模型参数研究[J].铁道工程学报,2017,34(3):22-28.
[9]	陈朝晖,魏超,罗绮雯,等.基于内聚力模型的FRP布加固混凝土梁柱子结构受力性能分析[J].建筑结构学报,2019,40(9):122-130.
[10]	潘毅,胡文豪,郭瑞,等.碳纤维增强复合网格-聚合物水泥砂浆加固RC梁的抗弯性能试验研究[J].建筑结构学报,2020,41(4):119-128.
[11]	中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 50010-2010[S].北京:中国建筑工业出版社,2011.
[12]	GUO R,PAN Y,CAI L H,et al.Bonding behavior of CFRP grid-concrete with PCM shotcrete[J].Engineering Structures,2018,168(2):333-345.
[13]	YAO J.Debonding failures in RC beams and slabs strengthened with FRP plates[D].Hong Kong:The Hong Kong Polytechnic University,2005.
[14]	CHEN J F,TENG J G.Anchorage strength models for FRP and steel plates bonded to concrete[J].Journal of Structural Engineering,2001,127(7):784-791.
[15]	BENCARDINO F,CARLONI C,CONDELLO A,et al.Flexural behavior of RC members strengthened with FRCM:state-of-the-art and predictive formulas[J].Composites Part B:Engineering,2018,194:132-148.
[16]	Italian National Research Council.Guide for the design and construction of externally bonded FRP systems for strengthening existing structures:CNR-DT200/2004[S].Rome:Italian National Research Council,2004.
[17]	YANG X,GAO W Y,DAI J G,et al.Flexural strengthening of RC beams with CFRP grid-reinforced ECC matrix[J].Composite Structures,2018,189:9-26.
[18]	ZHENG Y Z,WANG W W,BRIGHAM J C.Flexural behavior of reinforced concrete beams strengthened with a composite reinforcement layer:BFRP grid and ECC[J].Construction and Building Materials,2016,115:424-437.