Experimental study on bond behavior between CFRP-steel composite bar and coral sea-sand seawater concrete

被引：0
|
作者：
Zhou J. [1 ]
Chen Z. [1 ,2 ,3 ]
Pang Y. [1 ]
Li S. [1 ]
Song C. [1 ]
机构：
[1] School of Civil Engineering and Architecture, Guangxi University, Nanning
[2] School of Architecture and Civil Engineering, Nanning University, Nanning
[3] Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2024年 / 45卷 / 08期
关键词：
bond behavior; bond-slip constitutive model; CFRP-steel composite bar; coral sea-sand seawater concrete; pull-out test;
D O I：
10.14006/j.jzjgxb.2023.0200
中图分类号：
学科分类号：
摘要：
In order to study the bond behavior between CFRP sheet wrapped steel composite bar (CFRP-steel composite bar, referred to as ‘composite bar’) and coral sea-sand seawater concrete (CSSC), 15 groups (a total of 45) bonding specimens were subjected to unilateral pull-out tests. The interface bonding failure mechanism of the composite bar and CSSC was revealed, and the influence of composite bar diameter, bonding length, cover thickness, concrete strength, concrete and reinforcement type on the bonding performance was analyzed. The test results show that unlike the steel bar, the shear damage occurs on the surface of the composite bar after sliding due to the poor shear resistance of the outer covering FRP, and the degree of breakage of the concrete in the interface layer is smaller. With the increase of composite bar diameter and bonding length, the bond strength of the interface decreases gradually. When the concrete cover is less than four times the diameter of the composite bar (dc ), increasing the concrete thickness can effectively improve the bond strength, but the strengthening effect is greatly weakened after the concrete cover is more than 4dc. Compared with the specimens embedded with composite bar, the bond strength of the specimens embedded with the same diameter of steel bar increases by 17. 9%. Compared with natural concrete (NC) specimens, the bond strength of CSSC specimens increases by 23. 8%, but the fracture degree of coarse aggregate of CSSC at the splitting interface is much higher than that of NC specimens. Based on the test results and collected similar research results, a formula for calculating the bond strength between composite bar and CSSC was proposed, which shows good calculation accuracy in large sample size. By determining the value range of bond coefficient K, a formula for calculating the critical anchorage length was established. To reflect the entire process of predicting the curve, it is recommended to use the mBPE model to accurately describe the bond stress-slip relationship between composite bar and CSSC in this paper. © 2024 Science Press. All rights reserved.
引用
收藏
页码：243 / 258
页数：15
相关论文
共 30 条
  • [1] SU Chen, MA Haiyan, YU Hongfa, Et al., Effect of different coral aggregates on mechanical properties of coral concrete, Journal of the Chinese Ceramic Society, 48, 11, pp. 1771-1780, (2020)
  • [2] WANG A, LYU B, ZHU Y, Et al., A gentle acid-wash and pre-coating treatment of coral aggregate to manufacture high-strength geopolymer concrete, Construction and Building Materials, 274, (2021)
  • [3] LIU B, GUO J, ZHOU J, Et al., The mechanical properties and microstructure of carbon fibers reinforced coral concrete, Construction and Building Materials, 249, (2020)
  • [4] DIAO Yitong, MA Haiyan, YU Hongfa, Et al., Strength of aggregate-paste interface transition zone of coral concrete, Journal of Building Materials, 24, 3, pp. 516-524, (2021)
  • [5] MI Renjie, YU Hongfa, MA Haiyan, Et al., Study on the mechanical property of coral concrete, The Ocean Engineering, 34, 4, pp. 47-54, (2016)
  • [6] CHENG S, SHUI Z, SUN T, Et al., Durability and microstructure of coral sand concrete incorporating supplementary cementitious materials, Construction and Building Materials, 171, pp. 44-53, (2018)
  • [7] ZHANG L, NIU D, WEN B, Et al., Corrosion behavior of low alloy steel bars containing Cr and Al in coral concrete for ocean construction, Construction and Building Materials, 258, (2020)
  • [8] ZHU Hong, DONG Zhiqiang, WU Gang, Et al., Experimental study and theoretical calculation on the flexural stiffness of concrete beams reinforced with FRP bars, China Civil Engineering Journal, 48, 11, pp. 44-53, (2015)
  • [9] ZHENG Bailin, LI Wei, ZHANG Weiwei, Et al., Mechanics behavior of FRP wrapped rebar reinforced concrete:I: microstructure design and analyses, Acta Materiae Compositae Sinica, 1, pp. 33-37, (2004)
  • [10] WU G, WU Z, LUO Y, Et al., Mechanical properties of steel-FRP composite bar under uniaxial and cyclic tensile loads, Journal of Materials in Civil Engineering, 22, 10, pp. 1056-1066, (2010)
123