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Title |
Tension Stiffening Effect in Axially loaded Concrete Member Oncrete Member
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Authors |
장낙섭(Nak Sup Jang) ; 노치훈(Chi Hoon Nho) ; 오홍섭(Hongseob Oh) |
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DOI |
https://doi.org/10.11112/jksmi.2023.27.6.47 |
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Keywords |
균열간격; FRP 보강근; 인장거동; 인장강화효과 Crack spacing; FRP bar; Tensile behavior; Tension stiffening effect |
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Abstract |
In this study, the tensile behavior of concrete specimens reinforced with GFRP (Glass Fiber Reinforced Polymer), BFRP (Basalt Fiber Reinforced Polymer), and CFRP (Carbon Fiber Reinforced Polymer) bars was experimentally analyzed. The tensile strength of the FRP bars is appeared to be similar to the design strength, but the elastic modulus was somewhat lower. Additionally, the specimens for tension stiffening effect were manufacured using OPC (Ordinary Portland Cement) and SFRC (Steel Fiber Reinforced Concrete), with dimensions of 150(W)×150(B)×1000(H) mm. The crack spacing of specimens was most significant for GFRP reinforcement bars, which have a lower elastic modulus and a smoother surface, while BFRP and CFRP bars, with somewhat rougher surfaces and higher elastic moduli, showed similar crack spacings. In the load-strain relationship, GFRP bars exhibited a relatively abrupt behavior after cracking, whereas BFRP and CFRP bars showed a more stable behavior after the cracking phase, maintaining a certain level of tension stiffening effect. The tension stiffening index was somewhat smaller as the diameter increased, and GFRP, compared to BFRP, showed a higher tension stiffening index.
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