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Title |
Investigation of Material Characteristics of Reinforced Concrete Beam After Exposure to Fire Test
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Authors |
주민관 ; 박철우 ; 오지현 ; 서상길 ; 심재원 |
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DOI |
http://dx.doi.org/10.11112/jksmi.2016.20.3.033 |
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Keywords |
화재실험 ; 철근콘크리트 보 ; 압축강도 ; 항복강도 ; 한계온도 Fire test ; RC beam ; Compressive strength ; Yielding strength ; Temperature limit |
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Abstract |
Concrete is inherently a good fire-resistance material among all other constrcution materials and protects the reinforcing steel inside. This study investigates the material characteristics of concrete and steel bar inside the full scale reinforced concrete(RC) beam exposed to fire test. The fire test specimen was 4 m long and the test was conducted under no loading condition following KS F 2257. Fire source is simulated by ISO 834 and number of thermocouples were installed to measure temperature variation of surfaces and inside of the beam. The measured compressive strength of cored specimen, which was exposed to fire test, was 11 MPa, about 66% lower than the strength before exposure. The yielding strength of steel bar also decreased about 75 MPa, about 17% lower. The measured temperature of protected steel bar was around 649℃, the critical limit, after 4 hour exposure.
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