Study on flexural behavior of BFRP reinforced-ECC-concrete composite beams strengthened with carbon fiber sheets

被引：0
|
作者：
Ge W. [1 ,2 ]
Zong Y. [1 ]
Qiu S. [1 ]
Song W. [1 ]
Wang Y. [1 ,2 ]
Lu W. [2 ]
Cao D. [1 ]
Ashraf A. [3 ]
机构：
[1] College of Civil Science and Engineering, Yangzhou University, Yangzhou
[2] College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou
[3] Department of Civil Engineering, University of Bradford, Bradford
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2021年 / 42卷
关键词：
BFRP bar; Carbon fiber sheet (CFS) strengthening; Composite beam; Concrete; ECC; Flexural behavior; Static test;
D O I：
10.14006/j.jzjgxb.2021.S1.0034
中图分类号：
学科分类号：
摘要：
The engineering structures usually need to be strengthened during their service period for the changing of service function or the increasing of service load. The flexural behaviors of a new type of basalt fiber reinforced polymer (BFRP) bars-engineered cementitious composite (ECC)-concrete composite beams strengthened by carbon fiber sheets (CFS) were investigated in this paper. The static flexural experiments of totally 12 BFRP-ECC-concrete composite beam specimens with three types of ECC height replace ratios (0, 0.29 and 0.58) strengthened by four kinds of CFS layers (one, two, three layers of CFS strengthened and unstrengthened specimens) were conducted. The effects of the number of CFS layers and the height replace ratios of ECC on the bearing capacity and failure mode of the strengthened composite beams were studied. The test results show that, using ECC layer with good tensile performance to replace the concrete in tension zone, the anti-deformation and anti-crack ability as well as the bearing capacity of the ECC-concrete composite beams have been improved. Compared with the unstrengthened specimens, the flexural capacity of the specimens strengthened by three layers of CFS is improved by 20%, while the deflection and crack width are reduced by 50% and 10%, respectively. Based on the theory of reinforced concrete structures, the reasonable basic assumptions and simplified constitutive models of materials, the calculation formulae for bending capacity of BFRP reinforced ECC-concrete composite beams strengthened with CFS were developed and the strength reduction factors of CFS were given. The predicted results are in good agreement with the test results. © 2021, Editorial Office of Journal of Building Structures. All right reserved.
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页码：302 / 311
页数：9
相关论文
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