Experiment and Calculation of Crack Width of Concrete Beams Reinforced with Hybrid (FRP and Steel) Bars

被引：0
|
作者：
Lu C.-H. [1 ]
Ruan X.-J. [1 ]
Zhang Z.-Z. [1 ]
Xu K. [1 ]
机构：
[1] School of Civil Engineering and Mechanics, Jiangsu University, Zhenjiang, 212013, Jiangsu
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2019年 / 32卷 / 09期
关键词：
Bridge engineering; Crack width; Experimental research; Flexural behavior; Hybrid reinforced concrete beam;
D O I：
10.19721/j.cnki.1001-7372.2019.09.012
中图分类号：
学科分类号：
摘要：
To study the crack propagation mechanism and its calculation method for concrete beams reinforced with hybrid fiber reinforced polymer (FRP) and steel (HRB) bars during the flexural process, eight hybrid and three steel reinforced concrete beams were designed. The flexural capacity, crack distribution, average crack spacing, and crack width of test beams were compared and analyzed by modifying parameters such as the FRP type, FRP diameter, strength of steel bar, area ratio of FRP bars to steel bars, and cross-sectional reinforcing ratio. A model was then developed to calculate the flexural capacity. A comparison between the theoretical and test values verified the accuracy and rationality of the proposed formula. Based on the traditional crack theory of reinforced concrete beams, the flexural cracking characteristics of 21 hybrid reinforced concrete beams were analyzed. With the collected experimental data, the calculation formulas for average crack spacing lm and non-uniform coefficient ψ of strain of the tensile stress bar under a serviceability limit state were put forward. The magnification coefficient derived from the short-term loading effect τs was corrected. Based on this, the proposed calculation model of the maximum short-term crack width was given. The results show that the cross section of hybrid reinforced concrete beam still meets the plane section assumption. With an increase in cross-sectional reinforcing ratio, the average crack spacing and maximum crack width of the hybrid reinforced concrete beam gradually reduced. The maximum crack width of the hybrid reinforced concrete beam with a single-layer reinforcement is greater than that of double-layer reinforcement, and the calculated precision of the average spacing of cracks is improved. The theoretical values of the proposed short-term maximum crack width are in good agreement with the test values, and thus, it can be used as a reference for hybrid reinforced concrete beam design. © 2019, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：124 / 131and142
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