Experimental Study on Stiffness of FRP Bar and Steel Fiber Reinforced High-strength Concrete Beams

被引：0

作者：

Zhu H. ^{[1
,2
]}

Cheng S. ^{[2
,3
]}

Gao D. ^{[2
]}

Wang R. ^{[4
]}

机构：

[1] College of Civil Engineering, Henan University of Engineering, Zhengzhou

[2] School of Water Conservancy Science & Engineering, Zhengzhou University, Zhengzhou

[3] China Construction Seventh Engineering Division Corp., Ltd., Zhengzhou

[4] Henan Water & Power Engineering Consulting Co., Ltd., Zhengzhou

来源：

Tiedao Xuebao/Journal of the China Railway Society | 2020年 / 42卷 / 12期

关键词：

Beam; Deflection; FRP bar; Steel fiber; Stiffness;

D O I：

10.3969/j.issn.1001-8360.2020.12.021

中图分类号：

学科分类号：

摘要：

In order to solve the large deflection, wide crack and brittle failure of the structures reinforced with FRP bars, a new structure, FRP bar and steel fiber reinforced high-strength concrete structure, was proposed. In this paper, 12 specimens were cast and tested, to investigate the influences of the depth of steel fiber layer, steel fiber volume fraction and FRP reinforcement ratio on the mid-span deflection of FRP bar and steel fiber reinforced high-strength concrete beams. The result shows that the stiffness degradation of the FRP reinforced concrete can be effectively restrained by steel fibers after the crack occurs. At 110 kN load, the deflection of the beam can be reduced by 36.38%-59.48% with a steel fiber volume ratio of 0.5% to 2.0%. When the depth of steel fiber layer is at 0.57 times of the height of specimens, the deformation and crack development of the specimen are close to those of the specimen with the steel fibers distributed over the full section. With the increase of FRP reinforcement ratio, the mid-span deflection of the beam decreases under the same load and the test beam shows a certain degree of ductility. Based on the test results and the research data collected from 23 FRP steel fiber reinforced concrete beams at home and abroad a calculating method, which can be used for evaluating the stiffness of FRP bar and steel fiber reinforced high-strength concrete beams, was proposed. © 2020, Department of Journal of the China Railway Society. All right reserved.

引用

页码：162 / 170

页数：8

共 15 条

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