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Title |
Flexural Experiments on Reinforced Concrete Beams Strengthened with SHCC and Special Reinforcements
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Authors |
현창진(Chang-Jin Hyun) ; 서지석(Ji-Seok Seo) ; 김윤용(Yun-Yong Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.1.46 |
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Keywords |
SHCC; 초고강도 철근; FRP 보강근; RC보; 휨 보강 SHCC; Very high strength rebar; FRP bars; Reinforced concrete beams; Flexural strengthening |
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Abstract |
In this paper, we evaluated the flexural performance of three types of reinforced concrete beams (SHCC-RB, SHCC-SB, SHCC-FRP)strengthened with ordinary steel rebar, very high strength (super strength) rebar, and FRP bars together with strain-hardening cement composite(SHCC). For this purpose, a series of beam specimens were manufactured and four-point load bending experiments were performed. As a result of theexperiment, all specimens strengthened with SHCC exhibited tightly controlled flexural microcrakcs with the crack width of less than 100 μm. Thisis mostly due to the material properties of SHCC showing tensile strain hardening properties with multiple microcracks under uniaxial tension. Thespecimen SHCC-FRP showed lower initial cracking moment and yield flexural strength than SHCC-RB, whereas the maximum flexural strength ofSHCC-FRP was superior to that of SHCC-RC. This is because the tensile strength of FRP bars is higher than that of ordinary steel reabr. The initialcracking moment of the beam specimen SHCC-SB was similar to that of SHCC-RB, but the yield flexural strength and maximum flexural strengthof SHCC-SB were evaluated to be the highest.
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