Flexural behavior of concrete beams reinforced with steel-BFRP composite bars subjected to chloride corrosion

被引：0
|
作者：
Ge W. [1 ,2 ]
Zhang S. [1 ]
Zhang Z. [1 ]
Ashraf A. [3 ]
Guan Z. [4 ]
Sun C. [2 ]
Cao D. [1 ]
机构：
[1] College of Civil Science and Engineering, Yangzhou University, Yangzhou
[2] Jiangsu Province Engineering Research Center of Prefabricated Building and Intelligent Construction, Suqian
[3] School of Engineering, University of Bradford, Bradford
[4] School of Engineering, University of Liverpool, Liverpool
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2023年 / 44卷 / 08期
关键词：
bearing capacity; chloride corrosion; concrete beam; crack; deflection; steel-basalt FRP composite bar;
D O I：
10.14006/j.jzjgxb.2022.B037
中图分类号：
学科分类号：
摘要：
The tensile tests of four kinds of reinforcements (one steel bar, one basalt fibre-reinforced polymer (BFRP) bar, and two steel-basalt FRP composite bars (B-SFCBs)) and flexural tests of five reinforced concrete beams (one reinforced with steel, one with BFRP steel and three with B-SFCBs) subjected to corrosion of sodium chloride solution were conducted to study the effects of chloride corrosion on the flexural behavior of concrete beams reinforced with B-SFCBs. The effects of stress level and corrosion duration on tensile properties of B-SFCBs as well as bearing capacity, deflection, crack, and failure patterns of concrete beams were investigated. The test results show that the strength retention ratio of bars decreases with the increase of corrosion duration, and the tensile strengths of steel bars, B-SFCB, and BFRP bars decrease by 12%, 10%, and 4%, respectively, after 180 days of chloride corrosion. The strength retention ratios of stressed corroded B-SFCBs and BFRP bars are higher than those of corresponding unstressed corroded ones. The B-SFCBs reinforced concrete beams exhibit stable flexural stiffness after the yielding of B-SFCBs, and its yield load increases with the increase of the area ratio of inner steel to B-SFCB. For unstressed corroded beams, the effect of corrosion duration on the moment-deflection curve is limited. However, for stressed corroded beams, the influence gradually becomes obvious with the increase of corrosion duration. The variation trend of the moment-crack width curve is almost the same as that of the moment-deflection curve. Based on the simplified material constitutive models and reasonable basic assumptions, three failure modes and their discriminate formulas as well as formulae for flexural capacity were proposed. Based on the design code of ACI 440 and GB 50010-2010, the formulae for stiffness and crack width of B-SFCBs reinforced concrete beams were also developed. The predicted results of bearing capacity, deflection, and crack width are in good accordance with tested results, illustrating the validity of the proposed formulas, which can be used in the practical design. © 2023 Science Press. All rights reserved.
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页码：170 / 184
页数：14
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