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철계-형상기억합금에 의한 철근콘크리트 보의 휨 보강효과
이수규 ( Lee Sugyu ),홍기남 ( Hong Ki-nam ),강판승 ( Kang Panseung ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
This study evaluates a prestressing effect of reinforced concrete (RC) beam strengthened with a pre-strained iron shape-memory alloy (Fe-SMA) strip. A pre-strained value was chosen as experimental variable to investigated the prestressing effect on the RC beams. A recovery stress on the pre-strained Fe-SMA strip occurred by heating, when the deformation of the strip was restricted. The recovery stress introduced a compressive force to the surrounding concrete, resuting in the upward deflection (camber effect). With this finiding from experimental tests, it could be concluded that the Fe-SMA strip can be used as the strengthening material to strengthen the damaged structure and to increase its durability.
고강도 재료를 활용한 횡구속 콘크리트의 국소변형률 측정
홍기남 ( Hong Ki-nam ),이수규 ( Lee Sugyu ),강판승 ( Kang Panseung ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
This study presents a technique for measuring the local strain of RC columns using high strength materials. A acrylic rod with strain gauges at intervals of 5 mm were embedded in high-strength RC columns. Under uniaxial compression loading, the local strain of the column was measured with strain gauges attached to the acrylic rod. It was confirmed from experimental results that the technique applied in this study is very effective in measuring the local strain of high-strength RC columns and the compressive failure of the high-strength RC columns is concentrated in some local regions.