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Inkyu Kwon - One of the best experts on this subject based on the ideXlab platform.
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Comparative Study of Fire Resistance Performance for Long Span Beams Constructed with High Strength Submarine Structural Steels According to Boundary Conditions
Key Engineering Materials, 2016Co-Authors: Inkyu KwonAbstract:Requirements for building have been increased not only structural aspects but Fire Resistance. Therefore, a structural steel having higher strength has been developed and applied into building industry. Especially, a SM 520 and a SM 570 have good construction efficiencies in fabrication site and construction site, for these have a better welding Performance and a higher strength than other structural steels. However, their Fire Resistance Performance of them doesn’t clear until now. In this study, to compare the Fire Resistance of long span beam built with SM 520 and SM 570, a Fire engineering technique was used using mechanical properties at high temperatures and analytical methods. As the structural grades are going up, the Performance of Fire Resistance is shown to be decreased.
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study on Fire Resistance Performance according to boundary conditions for beams made of high strength structural steels using analytical methods
Fire Science and Engineering, 2015Co-Authors: Inkyu KwonAbstract:건축물의 공간 효율성 증대를 주 목적으로 고강재 강재(SM 520)의 사용이 활성화되고 있으나, 화재와 같은 고온조건에서의 보부재에 대한 내화성능은 검증되지 못하고 있는 실정이다. 따라서 본 연구에서는 SM 520강재가 적용된 양단고정단 경계조건인 부정정 보부재를 대상으로 표준화재온도곡선과 고온에서의 항복강도, 탄성계수 그리고 비열, 선팽창계수를 적용하는 해석적 방법을 통하여 내화성능을 평가하고, 이를 바탕으로 일반 구조용 강재에 의한 보부재의 내화성능 평가의 안전성을 확인하였다.ABSTRACTRecently, structural materials have been developed to have high Performance, and SM 520 has been developed andused for high-rise buildings. However, Fires frequently occur in buildings, and the number of victims and amount of dam-age increase year by year. However, the evaluation of Fire Resistance Performance for structural beams made of SM 520 isdone with specimens made of ordinary structural steels with boundary conditions of a fixed beam, and the results areallowed for use in steel-framed buildings. This study analyzed the Fire Resistance Performance of statistically indetermi-nate beams built with SM 520. The analysis used a Fire engineering technique that includes mechanical and thermal dataof SM 520 and heat transfer theory, and heat stress analysis was also conducted. The results from the analysis were com-pared with those from a statistically determinate beam made of ordinary structural steels.Keywords : High strength steels, SM 520, Fire Resistance Performance, Fire design
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An Analysis of the Fire Resistance Performance of H-Section with Variance of Column Lengths at High Temperature
Applied Mechanics and Materials, 2014Co-Authors: Inkyu KwonAbstract:Structural columns are very important members in steel buildings. An evaluation of Fire Resistance Performance of the column is essential to sustain the structural stability in a Fire situation. However, the length of columns is dependent on various architectural design variations. Therefore, the Fire Resistance can be different according to the length of column. In this study, to suggest the adequate Fire Resistance Performance of structural columns by difference of length, an analysis was done based on an ordinary structural steels, SS 400, and hinge to hinge boundary condition. The result showed that the longer the column was, the less the Fire Resistance.
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Analytic Study of Structural Stability at High Temperature of Structural Beam Made of SM 400
Advanced Materials Research, 2014Co-Authors: Inkyu KwonAbstract:A Fire occurred in the steel framed building could be yielded an unexpected disasters including loss of human lives and damages of properties. Therefore, to evade the tragedies from the building, Fire Resistance Performance of structural elements is required and specified into each nation’s building regulation. Especially, the structural beam plays a key role to transfer the load applied on the floor to column. In this study, to estimate the Fire Resistance Performance of structural beam made of SM 400, analysis using not only mechanical, thermal properties at high temperature of the SM 400 but theories of heat transfer and thermal stress were conducted. The result of this study showed that as the lengths of beam are increased, the structural stability become getting worse. Therefore, it is not recommended to use the same thickness of Fire protective materials derived from prototype’s length, 4100 mm to longer beam.
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An Evaluation of the Fire Performance of H-Section Made of Ordinary Strength Structural Steels by Differences of Length
Advanced Materials Research, 2014Co-Authors: Inkyu KwonAbstract:Fire Resistance Performance in steel building is very important for sustaining structural stability during a Fire. However, the Fire Performance has been evaluated by Fire test with only one length of the H-section made of an ordinary strength structural steel, such as SS 400 or SM 400. These have the same yield strength, but SM 400 has a better weldability. Therefore, the determination of Fire protective materials can be difficult when the H-section made of SS 400 and SM 400 is applied into columns having different lengths are changed. In this paper, an evaluation was conducted to suggest a new guideline for the Fire Resistance of H-section built with an ordinary strength steels such as SS 400 and SM 400 and having variance of lengths. The results revealed the H-section made of SM 400 showed a little better Fire Resistance Performance. Also, the longer the length of column, the less the Fire Resistance. Therefore, a new guideline is required to compensate the Fire Resistance of longer column than that from Fire tested.
Mohamed A. Sultan - One of the best experts on this subject based on the ideXlab platform.
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Fire Resistance of Wood Truss Floor Assemblies
Fire Technology, 2015Co-Authors: Mohamed A. SultanAbstract:This paper presents and discusses the factors that affect the Fire Resistance Performance of lightweight wood truss floor assemblies protected with two layers of Type X gypsum board ceiling finishes. Fifteen full-scale Fire Resistance floor experiments were conducted using the CAN/ULC S-101 Fire Resistance standard which is similar to the ASTM E119. Parameters investigated in this study include the effects of insulation installation in floor cavity, insulation type, wood truss spacing, resilient channel installation, resilient channel spacing, wood truss width, wood truss chord orientation, wood truss web type, wood truss connection type and adding concrete topping above the sub-floor. The impact of these parameters on the Fire Resistance Performance of the wood truss floor assemblies is discussed. The Fire Resistance of wood truss floors appears to be essentially governed by the wood trusses’ spacing for direct application of gypsum board to wood truss framing, insulation type and resilient channel installation and spacing. Other parameters are of secondary importance.
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Fire Resistance of Wood Truss Floor Assemblies
Fire Technology, 2012Co-Authors: Mohamed A. SultanAbstract:This paper presents and discusses the factors that affect the Fire Resistance Performance of lightweight wood truss floor assemblies protected with two layers of Type X gypsum board ceiling finishes. Fifteen full-scale Fire Resistance floor experiments were conducted using the CAN/ULC S-101 Fire Resistance standard which is similar to the ASTM E119. Parameters investigated in this study include the effects of insulation installation in floor cavity, insulation type, wood truss spacing, resilient channel installation, resilient channel spacing, wood truss width, wood truss chord orientation, wood truss web type, wood truss connection type and adding concrete topping above the sub-floor. The impact of these parameters on the Fire Resistance Performance of the wood truss floor assemblies is discussed. The Fire Resistance of wood truss floors appears to be essentially governed by the wood trusses\u2019 spacing for direct application of gypsum board to wood truss framing, insulation type and resilient channel installation and spacing. Other parameters are of secondary importance.Peer reviewed: YesNRC publication: Ye
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Fire Resistance of wood joist floor assemblies
Fire Technology, 2008Co-Authors: Mohamed A. SultanAbstract:This paper presents and discusses the factors that affect the Fire Resistance Performance of lightweight wood truss floor assemblies protected with two layers of Type X gypsum board ceiling finishes. Fifteen full-scale Fire Resistance floor experiments were conducted using the CAN/ULC S-101 Fire Resistance standard which is similar to the ASTM E119. Parameters investigated in this study include the effects of insulation installation in floor cavity, insulation type, wood truss spacing, resilient channel installation, resilient channel spacing, wood truss width, wood truss chord orientation, wood truss web type, wood truss connection type and adding concrete topping above the sub-floor. The impact of these parameters on the Fire Resistance Performance of the wood truss floor assemblies is discussed. The Fire Resistance of wood truss floors appears to be essentially governed by the wood trusses’ spacing for direct application of gypsum board to wood truss framing, insulation type and resilient channel installation and spacing. Other parameters are of secondary importance.
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Fire Resistance Performance of Lightweight Wood-Framed Assemblies
Fire Technology, 2000Co-Authors: Noureddine Bénichou, Mohamed A. SultanAbstract:There are extensive efforts underway around the world, including those by the National Research Council of Canada (NRC), to develop Fire Resistance models. NRC is currently developing thermal and structural models for lightweight wood-framed assemblies, in collaboration with the Canadian wood industry. These models will be used in NRC's risk-cost assessment models as well as in the development of Fire Resistance design equations. To aid the development of Fire Resistance models, NRC has just completed, as a first step, a literature review on the efforts made to predict the Fire Resistance of lightweight wood-framed assemblies, with the objective of determining the gaps that need to be filled. This paper presents the results of this literature review, which include: standard versus real time-temperature Fire curves, experimental studies, available Fire Resistance models and design methods and the identification of their limitations, charring of wood, and material properties of assembly components at elevated temperatures.
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Light-Weight Frame Wall Assemblies: Parameters for Consideration in Fire Resistance Performance-Based Design
Fire Technology, 2000Co-Authors: Mohamed A. Sultan, Venkatesh R. KodurAbstract:With the advent of Performance-based codes and Fire safety design options, it is essential to determine parameters that affect the Fire-Resistance Performance of assemblies. This paper presents the results of 17 full-scale Fire-Resistance tests conducted as part of a major industry-government research program investigating parameters that affect the Fire-Resistance Performance of light-weight frame wall assemblies. These include the effects of insulation type, insulation width between studs, resilient channel location, gypsum board thickness, number of gypsum board layers, glass fiber in the gypsum board core, gypsum board mass per unit area, and stud type for light-weight frame wall assemblies finished with gypsum board. The effects of these parameters on the Fire Resistance are discussed.
Heung-youl Kim - One of the best experts on this subject based on the ideXlab platform.
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A Study on the Collapse Mechanism of High Strength Concrete Columns Apply to Fiber-Cocktail
Applied Mechanics and Materials, 2015Co-Authors: Ki Seok Kwon, Heung-youl Kim, Seung Un Chae, Bumyean ChoAbstract:More high-rise structures are currently being constructed and correspondingly, the compressive strength of concrete has been increased. However, compared to conventional strength concrete the high strength concrete (HSC) exhibits coarse inner pore structure which blocks escape routes of vapour generated in the event of Fire. This results in spalling and subsequently, are responsible for Fire vulnerability of the structure. In addition, spalling phenomena is also affected by the section dimensions of HSC which is also another crucial factor from socio-economic considerations. Thus, this study was carried out to evaluate the Fire Resistance Performance of hybrid fiber (i.e. steel-polypropylene-fibre)-reinforced HSC columns with different cross-section dimensions. The result of the Fire Resistance Performance testing using 100MPa concrete showed that delay to failure was observed by approximately 76 per cent.
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Experimental Study on the Fire Resistance Performance of Prestressed Composite Beam with Corrugated Web under Standard Fire with Loading Condition
10th Annual Conference of the International Institute for Infrastructure Renewal and Reconstruction, 2014Co-Authors: Heung-youl Kim, Hyungjun Kim, Kyung Hoon Park, Bumyean ChoAbstract:In this study, Fire Resistance tests were performed on a conventional slim floor beam and a prestressed composite beam with corrugated webs, which is suitable for a long-span structure with a reduction in story height by utilizing the prestress and accordion effect. In the Fire test program, the ISO 834 standard Fire curve was adopted. Key test variables were the effect of prestress, shape of corrugated webs, and thickness of sprayed Fireproofing material. All of the test specimens demonstrated enhanced Fire Resistance Performance exceeding the expected Performance level. The prestressed composite beams with corrugated webs especially showed excellent Fire Performance, considering these specimens had thin Fireproofing thickness compared to the conventional slim floor specimen.
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Fire Resistance Performance of High-Strength Concrete Columns Reinforced with Pre-Stressed Wire Ropes
Applied Mechanics and Materials, 2013Co-Authors: Heung-youl Kim, Hyungjun Kim, Kyung Hoon Park, Bum Youn Cho, Jaesung LeeAbstract:In this study, the Fire Resistance Performance of high-strength concrete columns was evaluated to see the influence of lateral confinement reinforcement with wire ropes for improving ductility, Fire Resistance reinforcement with fiber cocktail and load ratio. For this, loaded Fire test was conducted under ISO834 standard Fire condition. The axial ductility of the 60MPa high-strength concrete column reinforced with pre-stressed wire ropes was improved and its Fire Resistance Performance was also improved by 23% compared with its counterpart without wire ropes. The appropriate load for the 60MPa concrete column reinforced with wire ropes was found to be 70% of design load. The Fire Resistance Performance of the 100MPa high-strength concrete column reinforced with pre-stressed wire ropes and fiber-cocktail was improved as much as 4 times compared with that reinforced with tie bars only. The appropriate load for the 100MPa columns was found to be less than 70% of design load in order for the columns to secure required Fire Resistance Performance.
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an experimental study on the Fire Resistance Performance of steel encased reinforcement concrete and steel framed mortar beam with loading condition
Journal of Korean Institute of Fire Science and Engineering, 2012Co-Authors: Hyungjun Kim, Heung-youl Kim, Inhwan Yeo, Kihyuck Kwon, Inkyu KwonAbstract:This study evaluates the Fire resisting capacity of the beam of the legal Fire Resistance construction, which establishes the Article 3 of the Regulations on Escape and Fire Resistance of Buildings. There are a total of five structures that we consider as legal Fire Resistance constructions, however, this study has a primary target of the reinforced concrete beam, and tests the Fire-resistant Performance depend on the covering depth of reinforce concrete. The results showed that it meets the three hours, the maximum statutory Fire Resistance time, if it was a load ratio of 0.5 and covering depth of 40 cm. Steel framed mortar beam is legal Fire Resistance structure that it was possessed three hours Fire Resistance Performance, if it was a load ratio of 0.4 and covering depth of 60 mm.
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An Experimental Study on the Fire Resistance Performance and Spalling of 100MPa HSC Column Mixed with Fiber-Cocktail
Advanced Materials Research, 2012Co-Authors: Inhwan Yeo, Heung-youl Kim, Hyungjun Kim, Kyung Ok KimAbstract:As the Fire-Resistance Performance of high-strength concrete has emerged as a social issue and Korean Ministry of Land, Transport & Maritime Affairs has announced the standard for the Fire-Resistance Performance of the concrete, studies to improve its Fire-Resistance have been conducted actively. In this paper, the study to develop high-strength concrete mixed with fiber-cocktail, a hybrid of polypropylene fiber and steel fiber was conducted. The Fire-Resistance test of 100MPa high-strength concrete and the analysis of steel bar temperatures for finding the optimal cross-sectional condition showed that the larger the section size is, the lower the temperature of steel bars is. It was also shown that the concrete columns with section sizes of 600mm x 600mm and 800mm x 800mm secure Fire-Resistance Performance and the former is the optimal section size in terms of economic efficiency. The analysis of steel bar temperatures of the column having section size of 600mm x 600mm showed that the polypropylene fiber to steel fiber ratio of 1.5 to 40 (㎏/㎥) is the optimal for the fiber cocktail.
Meijing Liu - One of the best experts on this subject based on the ideXlab platform.
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Fire-resistant design of eccentrically compressed stainless steel columns with constraints
Fire Safety Journal, 2018Co-Authors: Meijing Liu, Shenggang Fan, Wenjun Sun, Runmin Ding, Ting ZhuAbstract:Abstract Based on the test results of 7 specimens in Fire, the numerical simulation analysis were performed on the Fire-Resistance Performance of the eccentrically compressed stainless steel columns with constraints and the numerical simulation methods were verified. The parametric analysis was carried out to investigate the influence of key factors (such as load ratio, eccentricity, axial constraint stiffness ratio, slenderness ratio, and so on) on the Fire-Resistance of the eccentrically compressed stainless steel columns with constraints. Based on the existing Fire-resistant design methods of unconstrained stainless steel columns, the calculation formula for the buckling temperature of eccentrically compressed stainless steel columns with constraints is proposed, and the relationship between the buckling temperature and failure temperature is obtained. The results show that the fitting formula can better predict the buckling temperature and the post-buckling stage may better improve the Fire Resistance Performance of stainless steel columns. The load ratio, eccentricity and axial constraint stiffness ratio are the key factors that determine the Fire-Resistance Performance of eccentrically compressed stainless steel columns with constraints. The greater the load ratio, eccentricity and axial constraint stiffness ratio, the greater the deviations between the buckling temperature and failure temperature become and the better the Fire Resistance Performance of columns in post-buckling stage. When the slenderness ratio is among 80–120, the difference between the buckling temperature and failure temperature is the smallest, and correspondingly, the Fire Resistance Performance of stainless steel column is weakest.
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Experimental investigation of eccentrically compressed stainless steel columns with constraints in Fire
Fire Safety Journal, 2018Co-Authors: Shenggang Fan, Wenjun Sun, Meijing Liu, Yang Guo, Yun Long HanAbstract:Abstract To study the behaviour reaction and failure mechanism of stainless steel columns in Fire, a series of Fire tests were performed on the eccentrically compressed columns with constraints, based on S30408 stainless steel. 7 specimens were used to investigate the effects of the load ratio n, eccentricity e and axial constraint stiffness ratio β on the Fire-Resistance Performance of eccentrically compressed stainless steel columns. The failure process and failure modes of stainless steel columns in Fire were revealed. The test phenomena, heating curve, deformation curve and buckling temperature were obtained. The test results show that the load ratio n (n = 0.22–0.35), eccentricity e and axial constraint stiffness ratio β (β = 0.0458 and 0.0495) are the key factors that determine the Fire-Resistance Performance of eccentrically compressed stainless steel columns with constraints. The larger the load ratio n, eccentricity e and axial constraint stiffness ratio β are, the lower the buckling temperature of the specimen. There are two main types of failure modes of eccentrically compressed stainless steel columns with constraints in Fire: the first is the overall buckling mode and the second is the local-overall interaction buckling mode. The failure modes depend mainly on the section dimensions and the section type of the stainless steel column. The process of bearing capacity of eccentrically compressed stainless steel columns with constraints in Fire goes through two stages: the prebuckling stage and the post-buckling stage. It takes times for the specimen to progress from the buckling state to the ultimate failure state. The bearing capacity of the post-buckling stage can effectively improve the Fire-Resistance Performance of the stainless steel column with constraints.
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experimental investigation on Fire Resistance of stainless steel columns with square hollow section
Thin-walled Structures, 2016Co-Authors: Shenggang Fan, Liyuan Zhang, Wenjun Sun, Xiaofeng Ding, Meijing LiuAbstract:Abstract To study the bearing capacity and failure mechanism of a square stainless steel column in Fire, a series of tests were performed on S30408 stainless steel, including 6 material mechanical property tests at room temperature, 16 material mechanical property tests at elevated temperature and Fire experiments on 8 square sections of stainless steel columns. Steady tests at elevated temperature were performed to investigate the mechanical properties of stainless steel. The stress–strain curve, elastic modulus, yield strength and the reduction factor of the ultimate strength of stainless steel at elevated temperature were determined, and the test results were compared with the European Codes. The experiments studied the properties of the square section stainless steel columns without axial constraints in Fire, which were compressed axially and eccentrically. The failure phenomenon, heating curve, deformation curve and critical temperature of the specimens were obtained. The effects of the load ratio, section dimension and eccentricity on the critical temperature and Fire-Resistance Performance of the stainless steel column were examined. The test results show that load ratio and eccentricity are the key factors for critical temperature and Fire-Resistance Performance of the stainless steel column without axial constraints.
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Fire Resistance of stainless steel beams with rectangular hollow section: Numerical investigation and design
Fire Safety Journal, 2016Co-Authors: Fan Shenggang, Guoqiang Chen, Xinfeng Xia, Zhixia Ding, Meijing LiuAbstract:Mechanical properties of materials at elevated temperatures are the key factors of structural Fire Resistance design. Relative to the carbon structural steel, stainless steel has superior stiffness and strength at elevated temperatures. The Fire resistant design method for stainless steel beams was investigated based on prior experimental studies on the 6 rectangular hollow section stainless steel beams in a Fire. In this paper, the numerical simulation and analysis for the Fire Resistance Performance of stainless steel beams were performed by the finite element software ABAQUS. The effects of parameters on the Fire Resistance Performance of stainless steel beams were studied, which focused on the load patterns, load ratio, span and section sizes (height, width and thickness) of stainless steel columns. Referring to the design methods for Fire Resistance of stainless steel in the European Code (EN 1993-1-2) and the European Design Manual, the formulae for ultimate bearing capacity and critical temperature were fitted for rectangular hollow section stainless steel beams in a Fire. Comparisons of fitting results with test results and code results indicate that the fitting formulae have a high level of accuracy and can predict the ultimate bearing capacity and critical temperature of the rectangular hollow section stainless steel beams in a Fire.
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Numerical Investigation on Fire Resistance of Stainless Steel Columns with Square Hollow Section under Axial Compression
Thin-walled Structures, 2015Co-Authors: Shenggang Fan, Liyuan Zhang, Wenjun Sun, Xiaofeng Ding, Meijing LiuAbstract:Abstract Based on the prior experimental studies on the 6 square hollow section stainless steel columns without axial constraints in Fire, the Fire Resistance Performance of stainless steel columns under axial compression was investigated in this paper. The numerical simulation and analysis of the Performance of stainless steel columns relative to Fire Resistance were conducted by the finite element software ABAQUS. The effects of various parameters on the Fire Resistance Performance of the stainless steel columns were studied, focusing on the initial defect amplitude, the load ratio and the length of the stainless steel columns. Referring to the structural Fire design methods of stainless steel in the European Code (EN 1993-1-2) and the Euro Inox/SCI Design Manual, the new formulae for ultimate bearing capacity at elevated temperatures were fitted for the axially compressed stainless steel columns. The comparison of fitting results with test results and code results indicates that the fitting formulae are highly accurate and can predict the capacity and critical temperature of the axially compressed stainless steel columns in Fire.
Hyungjun Kim - One of the best experts on this subject based on the ideXlab platform.
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Experimental Study on the Fire Resistance Performance of Prestressed Composite Beam with Corrugated Web under Standard Fire with Loading Condition
10th Annual Conference of the International Institute for Infrastructure Renewal and Reconstruction, 2014Co-Authors: Heung-youl Kim, Hyungjun Kim, Kyung Hoon Park, Bumyean ChoAbstract:In this study, Fire Resistance tests were performed on a conventional slim floor beam and a prestressed composite beam with corrugated webs, which is suitable for a long-span structure with a reduction in story height by utilizing the prestress and accordion effect. In the Fire test program, the ISO 834 standard Fire curve was adopted. Key test variables were the effect of prestress, shape of corrugated webs, and thickness of sprayed Fireproofing material. All of the test specimens demonstrated enhanced Fire Resistance Performance exceeding the expected Performance level. The prestressed composite beams with corrugated webs especially showed excellent Fire Performance, considering these specimens had thin Fireproofing thickness compared to the conventional slim floor specimen.
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Fire Resistance Performance of High-Strength Concrete Columns Reinforced with Pre-Stressed Wire Ropes
Applied Mechanics and Materials, 2013Co-Authors: Heung-youl Kim, Hyungjun Kim, Kyung Hoon Park, Bum Youn Cho, Jaesung LeeAbstract:In this study, the Fire Resistance Performance of high-strength concrete columns was evaluated to see the influence of lateral confinement reinforcement with wire ropes for improving ductility, Fire Resistance reinforcement with fiber cocktail and load ratio. For this, loaded Fire test was conducted under ISO834 standard Fire condition. The axial ductility of the 60MPa high-strength concrete column reinforced with pre-stressed wire ropes was improved and its Fire Resistance Performance was also improved by 23% compared with its counterpart without wire ropes. The appropriate load for the 60MPa concrete column reinforced with wire ropes was found to be 70% of design load. The Fire Resistance Performance of the 100MPa high-strength concrete column reinforced with pre-stressed wire ropes and fiber-cocktail was improved as much as 4 times compared with that reinforced with tie bars only. The appropriate load for the 100MPa columns was found to be less than 70% of design load in order for the columns to secure required Fire Resistance Performance.
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an experimental study on the Fire Resistance Performance of steel encased reinforcement concrete and steel framed mortar beam with loading condition
Journal of Korean Institute of Fire Science and Engineering, 2012Co-Authors: Hyungjun Kim, Heung-youl Kim, Inhwan Yeo, Kihyuck Kwon, Inkyu KwonAbstract:This study evaluates the Fire resisting capacity of the beam of the legal Fire Resistance construction, which establishes the Article 3 of the Regulations on Escape and Fire Resistance of Buildings. There are a total of five structures that we consider as legal Fire Resistance constructions, however, this study has a primary target of the reinforced concrete beam, and tests the Fire-resistant Performance depend on the covering depth of reinforce concrete. The results showed that it meets the three hours, the maximum statutory Fire Resistance time, if it was a load ratio of 0.5 and covering depth of 40 cm. Steel framed mortar beam is legal Fire Resistance structure that it was possessed three hours Fire Resistance Performance, if it was a load ratio of 0.4 and covering depth of 60 mm.
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An Experimental Study on the Fire Resistance Performance and Spalling of 100MPa HSC Column Mixed with Fiber-Cocktail
Advanced Materials Research, 2012Co-Authors: Inhwan Yeo, Heung-youl Kim, Hyungjun Kim, Kyung Ok KimAbstract:As the Fire-Resistance Performance of high-strength concrete has emerged as a social issue and Korean Ministry of Land, Transport & Maritime Affairs has announced the standard for the Fire-Resistance Performance of the concrete, studies to improve its Fire-Resistance have been conducted actively. In this paper, the study to develop high-strength concrete mixed with fiber-cocktail, a hybrid of polypropylene fiber and steel fiber was conducted. The Fire-Resistance test of 100MPa high-strength concrete and the analysis of steel bar temperatures for finding the optimal cross-sectional condition showed that the larger the section size is, the lower the temperature of steel bars is. It was also shown that the concrete columns with section sizes of 600mm x 600mm and 800mm x 800mm secure Fire-Resistance Performance and the former is the optimal section size in terms of economic efficiency. The analysis of steel bar temperatures of the column having section size of 600mm x 600mm showed that the polypropylene fiber to steel fiber ratio of 1.5 to 40 (㎏/㎥) is the optimal for the fiber cocktail.
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An Experimental Study on Fire Resistance Performance and Evaluation of Asymmetric Slim Floor Beam
Advanced Materials Research, 2012Co-Authors: Hyungjun Kim, Heung-youl Kim, Sooyoung ParkAbstract:Composite beam using asymmetric H-shaped steel is one of the constructional structures developed in the advanced countries in Europe since early 1990s. The purpose of this study on composite beams where H-shaped steel is partially laid in concrete slabs was to find how to design Fire protection and improve Fire-Resistance to make deep deck plates provide the beams with advantages upon a Fire and to improve stiffness in structural aspect. Only lower flange which is directly exposed to a Fire was included in Fire-Resistance design in order to decide optimal Fire- protection design condition and test was conducted for spray-coating and paint-coating. In the Fire Resistance test, web thickness and lower flange thickness were varied to derive the optimum condition for improving Fire-Resistance Performance. It was observed from the test that 90-minute-protection employed to lower flange provided Fire Resistance for 3 hours. It was also observed that the basic shape resisted Fire for 89 minutes, while web reinforcement and lower flange reinforcement provided Fire-Resistance for 112 and 157 minutes, respectively. The result showed that lower flange reinforcement is the most effective way to improve Fire-Resistance.