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Title |
Effect of High Temperature on Mechanical Properties of Confined Concrete with Lateral Reinforcement
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Keywords |
구속 콘크리트 ; 횡방향 철근 ; 잔존 역학적 특성 ; 온도상승 Confined concrete ; Lateral reinforcement ; Residual mechanical property ; Temperature rise |
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Abstract |
The lateral reinforcements of concrete such as hoops and spiral bars are known to confine concrete to compensate the strength loss due to fire by reducing explosive spalling and improving the capacity of ductility. In this context, a study was conducted to investigate the residual mechanical properties of confined and unconfined concrete(fck=60MPa) after a single thermal cycle at 300, 600, 800℃. The main parameters required to establish the stress-strain relationship are the peak stress, the elastic modulus, and the strain at peak stress. The knowledge of the residual mechanical properties of concrete is necessary whenever the thermally damaged structure is required to bear a significant share of the loads, even after a severe thermal accident. Based on the results obtained in this study, the residual stress of confined concrete under thermal damage is higher according to the level of confinement and the larger strain made it to have better ductility. The decreasing ratio of elastic modulus from the relationship of stress and strain was also smaller than that of unconfined concrete.
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