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Title |
Long-term Flexural Behavior of RC Beams Strengthened in Flexure with NSM Fe-SMA Strips
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Authors |
홍기남(Ki-Nam Hong) ; 이수규(Sugyu Lee) ; 한상훈(Sang-Hoon Han) ; 강판승(Panseung Kang) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.3.103 |
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Keywords |
철계-형상기억합금 ; 표면매립공법 ; 장기거동 ; 형상기억효과 ; 사전변형 ; 처짐 Iron-based shape memory alloy ; Near-surface mounted method ; Long-term behavior ; Shape memory effect ; Pre-strain ; Deflection |
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Abstract |
The long-term flexural behavior of reinforced concrete (RC) beams strengthened with an iron based-shape memory alloys (Fe-SMAs) by a near-surface mounted (NSM) method was evaluated. The pre-strained values of 2% and 4% and introduced prestressing force by an activation of a shape memory effect of the Fe-SMA strengthening material were considered as experimental variables. Deflections at the center of the RC beams were measured for six months after the 1 tonf concrete weight was loaded on the beam. Experimental results show that the deflections decreased because of the increased flexural stiffness of beams strengthened with the Fe-SMA strips. On the contrary, with increased pre-strained values, the deflection increased due to stiffness reduction of the strengthening material. It was confirmed that the specimens incorporating the prestressed force showed the deflection reduction of about 30%, compared to the ones without the prestressed force.
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