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Title |
Strength of RC Beam with Various Shear Reinforcement Ratios After Experiencing Different Duration of Fire Load
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Keywords |
전단보강근비 ; 화재하중 ; 파괴실험 ; 기간 ; 취성적 파괴 Shear reinforcement ratio ; fire load ; failure test ; duration ; brittle failure |
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Abstract |
This paper presents research result to study the change of structural capacity of reinforced concrete beams with various shear reinforcement ratios after damage by fire load. In addition, fundamental data are given in order to predict the strength variation of RC member due to fire damage by evaluating the previous calculation method codified in codes. Nine RC beam specimens were made and exposed to the fire controled by the standard fire curve. And the structural capacity was evaluated through a failure test under simple support condition. Previous code formula, ACI code and Eurocode were reviewed and used for the calculation of the strength of specimens damaged by fire. From the test, RC beam specimens exhibited very brittle failure when it exposed to fire controled by standard fire curve during more than one hour. And this failure pattern tended to be more serious when shear reinforcement ratio decreased or fire loading duration increased. From the evaluation of the calculation process in code, the change of strength due to fire can be properly predicted if the damage of materials is well defined.
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