Bonding mechanism and strength calculation model of GFRP-steel composite rebars embedded in concrete

被引：0
作者：
Gao D. [1 ,2 ]
Fang D. [1 ]
Gu H. [1 ]
机构：
[1] School of Civil Engineering, Zhengzhou University, Zhengzhou
[2] Institute of Civil Engineering, Henan University of Engineering, Zhengzhou
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2018年 / 39卷 / 04期
关键词：
Bonding strength; Concrete; GFRP-steel composite rebar; Pull-out test;
D O I：
10.14006/j.jzjgxb.2018.04.015
中图分类号：
学科分类号：
摘要：
GFRP-steel composite rebar has high tensile strength, good corrosion resistance, light weight, and high elastic modulus. Nonetheless, whether the high tensile strength of composite rebar could be made full use mainly depends on its bond strength with concrete. A total of 15 pull-out tests were conducted to investigate the effects of rebar type, rebar diameter, steel strand volume ratio, concrete cover thickness and concrete strength on the failure mode and bond strength of FRP bars embedded in concrete. The results show that the composite rebar has higher bond strength with concrete than the GFRP one. Although the bond strength of the composite rebar increases with increase in steel strand volume fraction, the strength is still lower than that of steel rebar. The bond strength is improved and the failure mode would change from concrete splitting to pullout of rebar with increase in concrete cover thickness. Also, the increase of concrete strength could improve the bond strength significantly. In addition to the experimental work, a calculation model for predicting the maximum bond stress of rebar in concrete was proposed by assuming that the adjacent concrete surrounding the rebar is an elastic body with cracks with residual strength. The model was developed according to the hoop stress distribution of the concrete surrounding the rebar. Finally, based on the proposed model and the test results, a design method for predicting the bond strength of ribbed FRP in concrete was presented by introducing a bond stress distribution coefficient. The predicted results for bond strength agree well with the test results. © 2018, Editorial Office of Journal of Building Structures. All right reserved.
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页码：130 / 139
页数：9
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