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Fire Behavior of Steel Columns Encased by Damaged Spray-applied Fire Resistive Material
곽윤근,페시키 스테반,권기현 대한건축학회 2008 Architectural research Vol.10 No.1
A Steel column with damaged spray-applied fire resistive material (SFRM) may exhibit reduced structural performance due to the effects of elevated temperature during fire events. Thus, the fire load behavior of steel columns with removed or reduced SFRM needs to be examined to predict the structural damage by fire. FEM analyses were performed for the flange thinning removal models in which the SFRM was reduced as a constant strip in thickness at the top flange of the column. The temperature results for all models obtained from the heat transfer analyses were included as an initial condition in the FEM structural analyses. In this study, the results of analysis show that even small remnants of SFRM led to an effective reduction of temperature at any given fire duration, and improved significantly the axial load capacity of a column as compared to the complete removal cases of SFRM.
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고성능 섬유보강 RC 보의 전단강도 설계식 개발에 관한 연구
곽윤근,권철성,이헌석,김우석,Kwak, Yoon-Keun,Kwon, Cheol-Sung,Lee, Heon-Seok,Kim, Woo-Suk 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.3
This paper deals with the shear strengthening effect of reinforced concrete (RC) beams strengthened with high-performance fiber sheets. There are many kinds of high-performance fibers, the high-performance fibers used in this study are carbon fibers. Fifteen strengthened RC beams, including a control beam, were experimentally evaluated to determine the improvements in shear strength. Test parameters were the strengthening ratios and strengthening methods of carbon fiber sheets (I-S, I-W, U-S, and U-W type). RC beams strengthened with carbon fiber sheets were tested under four-point loads. Considering strengthening ratios and strengthening methods of carbon fiber sheets, shear capacity and failure mode of test specimens were evaluated. The results show that the shear capacity of beams strengthened with carbon fiber sheets are approximately 28.8% in I-S type, 20.5% in I-W type, 26% in U-S type, and 28.70% in U-W type higher than that of the control beam. The results of previous tests by other researchers were reviewed to evaluate the shear strength of RC beams strengthened with carbon fiber sheets. Existing equations for predicting the shear strength of such beams were examined, and a new equation based on empirical observations was proposed. The proposed equation gave accurate estimates for the 84 shear specimens evaluated.
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