Experimental study of concrete beams reinforced with hybrid bars (SFCBs and BFRP bars)
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ORIGINAL ARTICLE
Experimental study of concrete beams reinforced with hybrid bars (SFCBs and BFRP bars) Yang Yang
. Ze-yang Sun . Gang Wu . Da-fu Cao . Deng Pan
Received: 25 January 2020 / Accepted: 16 June 2020 Ó RILEM 2020
Abstract This paper presents the flexural performance of new hybrid concrete beams reinforced with steel fiber-reinforced polymer composite bars (SFCBs) and basalt fiber-reinforced polymer (BFRP) bars. Ten concrete beams reinforced with hybrid SFCBs, BFRP bars, and steel bars were constructed and tested. The main parameters were the reinforcement ratio and the ratio of FRP and steel content. The new hybrid-RC beams (with SFCBs and BFRP bars) exhibited good serviceability and ductility compared to the traditional hybrid-RC beams (with steels and BFRP bars), and the proposed model can accurately predict the moment capacity, deflection and crack width of all types of hybrid-RC beams (with SFCBs,
Y. Yang D. Cao D. Pan College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China e-mail: [email protected] D. Cao e-mail: [email protected] D. Pan e-mail: [email protected] Z. Sun G. Wu (&) Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, Southeast University, Nanjing 210096, China e-mail: [email protected] Z. Sun e-mail: [email protected]
BFRP bars and steel bars) based on the experimental results and the predictions. Keywords Flexural behavior Steel fiber-reinforced polymer composite bar (SFCB) Basalt fiberreinforced polymer (BFRP) Hybrid bars
1 Introduction The corrosion of steel bars is the main cause of traditional concrete (RC) structures in normal service, especially in the corrosive environment. The investigation shows that oxygen, moisture and corrosive substance penetrate to the inner areas of the RC structure, and then, corrosion occurs as follows: the surface of the steel reinforcement is firstly oxidized, consequently, the accumulated oxidized substance make the concrete cover easily peel off. Then, the inner steel reinforcements in the RC structure will further be corroded [1, 2]. Although fiber-reinforced polymer (FRP) is considered as high strength, lightweight, and good durability to replace the steel bars, the application is still limited in concrete structures. The reason lies in that FRP reinforced concrete (FRP-RC) structures not only behave greater deformation due to low elastic modulus, but also exhibit linear elastic behavior with no ductility [3–6].
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Materials and Structures (2020)53:77
In order to improve the ductility and stiffness of FRP-RC structures, the combination of FRP and steel bars has been proposed to reinforced concrete beams. In hybrid-reinforced concrete beams (hybrid-RC), FRP and steel bars were placed near the outer and inner surface of the tension zone respectively. The steel bars can offer high stiffness and ductility in concrete beams due to their high elastic modulus and elastoplastic properties, whereas the
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