GFRP筋与箍筋约束混凝土之间粘结性能的试验研究

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (10): 13-20.

GFRP筋与箍筋约束混凝土之间粘结性能的试验研究

胡成超, 高奎, 涂建维^*, 付金海

武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070

收稿日期:2020-03-09 出版日期:2020-10-28 发布日期:2020-10-28
通讯作者: 涂建维(1975-),男,博士,教授,研究方向为无机纤维筋混凝土结构,tujianwei@whut.edu.cn。
作者简介:胡成超(1995-),男,硕士研究生,研究方向为无机纤维筋混凝土结构。
基金资助:
国家自然科学基金资助项目(51478372);国家“十二五”规划科技支撑项目(2014BAB15B01);湖北省自然科学基金资助项目(2016CFA020)

EXPERIMENTAL RESEARCH ON BOND BEHAVIOR BETWEEN GFRP BARS AND STIRRUPS-CONFINED CONCRETE

HU Cheng-chao, GAO Kui, TU Jian-wei^*, FU Jin-hai

Hubei Key Laboratory of Roadway Bridge and Structure Engineering, Wuhan University of Technology, Wuhan 430070, China

Received:2020-03-09 Online:2020-10-28 Published:2020-10-28

摘要/Abstract

摘要： 通过设计并完成120个拉拔试验,研究了不同影响因素(GFRP筋表面处理情况、GFRP筋直径、混凝土强度等级、箍筋约束情况)对GFRP筋粘结性能的影响并与钢筋粘结性能进行对比;重点分析了箍筋约束作用对GFRP筋粘结破坏和粘结强度的影响规律;利用Bertero-Popov-Eligehausen(BPE)模型和Cosenza-Manfredi-Realfonzo(CMR)模型对GFRP筋在箍筋约束混凝土中粘结应力-滑移(τ-s)关系上升段进行分析。研究结果表明:当粘结破坏主要发生在GFRP筋表面时,提高混凝土强度不会增加GFRP筋的粘结强度;在拉拔试件中配置箍筋可以使试件发生更加趋于延性的GFRP筋拔出破坏,从而提高GFRP筋粘结强度和对应的滑移量,提高幅度随着GFRP筋直径和GFRP筋与混凝土之间的机械咬合力的增大而变大;BPE和CMR模型可以准确描述GFRP筋在箍筋约束混凝土中τ-s关系上升段过程,利用试验数据,并基于表面处理方式处理后得到的BPE和CMR模型中具体的参数可以作为设计参考值。

关键词: GFRP筋, 混凝土, 箍筋约束作用, 粘结性能, 粘结应力-滑移关系, 复合材料

Abstract: Through the results of 120 pullout tests, the influence of different factors (the surface treatment of GFRP bars, the diameter of GFRP bars, concrete strength grade and the confined effect of stirrups) on the bond behavior of GFRP bars is studied and compared with steel bars. Then, the influence of the confined effect of stirrups on the bond failure and bond strength of GFRP bars is analyzed. Finally, the Bertero-Popov-Eligehausen (BPE) and Cosenza-Manfredi-Realfonzo (CMR) models are used to analyze the rising section of bond stress-slip (τ-s) relationship of GFRP bars in stirrup confined concrete. The test results indicate that when the bond failure interface only occurs on the surface of a GFRP bar, the bond strength is not dependent upon the concrete strength. Moreover, the results indicate that in comparison to specimens without stirrups, their stirrup-containing counterparts are more prone to pullout failure with greater ductility and higher bond strength and corresponding slip. The BPE and CMR models are able to investigate the τ-s relationship between GFRP bars and the stirrups-confined concrete with accuracy. With the experimental data, the specific parameters in the models classified by surface characteristics have been suggested.

Key words: GFRP bars, concrete, stirrups-confined concrete, bond behavior, bond stress-slip relationship, composites

中图分类号:

TB332

胡成超, 高奎, 涂建维, 付金海. GFRP筋与箍筋约束混凝土之间粘结性能的试验研究[J]. 复合材料科学与工程, 2020, 0(10): 13-20.

HU Cheng-chao, GAO Kui, TU Jian-wei, FU Jin-hai. EXPERIMENTAL RESEARCH ON BOND BEHAVIOR BETWEEN GFRP BARS AND STIRRUPS-CONFINED CONCRETE[J]. Composites Science and Engineering, 2020, 0(10): 13-20.

参考文献

[1] KASSEM C, FARGHALY A S, Benmokrane B. Evaluation of flexural behavior and service ability performance of concrete beams reinforced with FRP bars[J]. Journal of Composites for Construction, 2011, 15(6): 682-695.
[2] ALI M A, EI-SALAKAWY E. Seismic performance of GFRP-reinforced concrete rectangular columns[J]. Journal of Composites for Construction, 2016, 20(3): 04015074.
[3] MADY M, EL-RAGABY A, EL-SALAKAWY E. Seismic behavior of beam-column joints reinforced with GFRP bars and stirrups[J]. Journal of Composites for Construction, 2011, 15(6): 875-886.
[4] SEBASTIAN W M, VINCENT J, STARKEY S. Experimental characterisation of load responses to failure of a RC frame and a NSM CFRP RC frame[J]. Construction & Building Materials, 2013, 49(Complete): 962-973.
[5] DARWIN D, GRAHAM E K. Effect of deformation height and spacing on bond strength of reinforcing bars[J]. ACI Structures Journal, 1993, 90(6): 646-657.
[6] ACI committee 408. Bond and development of straight reinforcing bars in tension: ACI 408R-03[S]. Farmington Hills, Michigan, USA: American Concrete Institute, 2003.
[7] WAMBEKE B W, SHIELD C K. Development length of glass fiber-reinforced polymer bars in concrete[J]. ACI Structures Journal, 2006, 103(1): 11-17.
[8] MOHAMED H M, AFIFI M Z, BENMOKRANE B. Performance evaluation of concrete columns reinforced longitudinally with FRP bars and confined with FRP hoops and spirals under axial load[J]. Journal of bridge engineering, 2014, 19(7): 04014020.1-04014020.12.
[9] MARANAN G B, MANALO A C, BENMOKRANE B, et al. Behavior of concentrically loaded geopolymer-concrete circular columns reinforced longitudinally and transversely with GFRP bars[J]. Engineering Structures, 2016, 117: 422-436.
[10] SONOBE Y, FUKUYAMA H, OKAMOTO T, et al. Design guidelines of FRP reinforced concrete building structures[J]. Journal of Composites for Construction, 1997, 1(3): 90-115.
[11] Canadian Standard Association (CSA). Design and construction of building components with fibre reinforced polymers: CAN/CSA S806-02[S]. Rexdale: 2002.
[12] Japan Society of Civil Engineers (JSCE). Recommendation for design and construction of concrete structures using continuous fiber reinforcing materials[S]. Tokyo: Concrete Engineering Series 23, A. Machida, ed., Japan Society of Civil Engineers, 1997.
[13] COSENZA E, MANFREDI G, REALFONZO R. Behavior and modeling of bond of FRP rebars to concrete[J]. Journal of Composites for Construction, 1997, 1(2): 40-51.
[14] COSENZA E, MANFREDI G, REALFONZO R. Analytical modelling of bond between FRP reinforcing bars and concrete [C]//"Non-Metallic (FRP) Reinforcement for Concrete Structures"-Proceedings of the Second International RILEM Symposium (FRPRCS-2). 1995: 164-171.
[15] YOO D Y, KWON K Y, PARK J J, et al. Local bond-slip response of GFRP rebar in ultra-high-performance fiber-reinforced concrete[J]. Composite Structures, 2015, 120: 53-64.
[16] ZHANG B, BENMOKRANE B, ASCE M. Pullout bond properties of fiber-reinforced polymer tendons to grout [J]. J. Mater. Civ. Eng., 2002, 14(5): 399-408.
[17] YAN F, LIN Z, YANG M. Bond mechanism and bond strength of GFRP bars to concrete: A review[J]. Composites Part B Engineering, 2016, 98: 56-69.