경계조건에 따른 고강도 H형강 부정정 보부재의 해석적 내화성능 연구

권인규 한국화재소방학회 2015 한국화재소방학회논문지 Vol.29 No.5

Recently, 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 damageincrease 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 indeterminatebeams 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 comparedwith those from a statistically determinate beam made of ordinary structural steels. 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.

Experimental Study on the Fire Resistance of Steel Columns Protected with Fire Boards

권인규,권영봉 한국강구조학회 2012 International Journal of Steel Structures Vol.12 No.1

The thickness of the fire protection material of steel columns should be determined to guarantee the load-bearing capacity of the steel columns during a fire. In Korean standards, the strength capacity of steel columns is evaluated by measuring the axial deflection or surface temperature of only one H-section of 300x300x10x15 or similar dimensions in a fire test. Once the thickness of a fire protection material is approved, it can be applied to any section, regardless of the size and shape. However,in order to properly protect a building from a severe fire, the appropriate thickness of the fire protection material should be determined with consideration of the section factor, size and shape of steel columns in accordance with building regulations. This paper describes a series of full-scale and small-scale fire tests which were conducted on H-section and Rectangular Hollow Section (RHS) steel columns protected with glass fiber reinforced gypsum (GRG) boards and cellulose fiber reinforced cement (CRC) boards. The main factors of the fire tests were the section factor, the section shape and the thickness of the fire protection materials. Simple equations to predict the thickness of a fire protection material of steel sections, accounting for the shape factor and the required fire resistance, are proposed. A comparative study on the efficiency between the newly developed columns with two types of fire boards and the conventional columns with a combination of spray and gypsum boards was also conducted, and results are reported herein.

천장텍스를 이용한 무내화피복 바닥 시스템 개발

권인규,지남용 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

Steel structures have been used as a good construction method in high-rise building since the early 1970s in Korea. The main merits of the steel structures seem to have much better robust structural entities and more speedy construction period and a more cost competative than the conventional concrete ways. But the steel has property of a decreasing loadbearing capacity when it happens to expose to an unexpected fire condition. For a sustaining of structural stability in fire, structural elements such as beams, columns and structural floor-ceiling assemblies should protect from fire. Traditionally, the floor-ceiling assemblies have already been used in several construction types consisted of steel, concrete and brick. Especially, where the floor-ceiling assemblies apply the steel structure, the fire protection material for beam element should be sprayed so as to meet the requirement of building regulation on fire. Contrary to Korea, the U.S.A. and the other countries, the U.K. Canada, can apply the floor-ceiling assembly without additional fire protection materials to beam element any more provided the authorized design was applied. In order to evaluate the performance of fire resistance for T-Bar type of the floor-ceiling assembly, we conducted 3 fire tests with specimens consisted of the acoustic-tile membrane as a finishing and concrete floor with cellular steel deck and steel beam. From the fire tests we found out that the bare steel beam endured 2 hours and 3 hours for the assembly with 20㎜ thickness of fire protective material to structural beam.

고강도 강재로 제작된 장스팬 보부재의 내화성능 평가연구

권인규 한국화재소방학회 2015 한국화재소방학회 학술대회 논문집 Vol.2015 No.추계

표면처리 경량형강 이용 내력벽체의 내화성능평가에 관한 해석 및 실험적 연구

권인규 대한건축학회지회연합회 2011 대한건축학회연합논문집 Vol.13 No.3

표면처리 경량형강 스터드와 방화석고보드 그리고 미네랄울로 구성된 내력벽체를 대상으로 1차원 열전달 해석으로 평가된 내화성능과 한국산업규격의 내화시험을 통하여 도출된 내화성능을 비교, 평가함으로써 향후 경량형강 이용 내력벽체의 해석적 내화성능 평가 가능성을 제시하고자 함을 연구목적으로 하여, 미네랄울에 의한 스터드 온도영향 그리고 내화성능 평가의 가능함을 확인하였다. Steel framed house made up of light gauge steels regarded as an alternative to meet the fast construction and high quality for the detached house, warehouse, and etc since the late of 1990's. The steel stud and steel joist applied as primary member and the finishing materials such as gypsum board, plywood would be attached on the frame and to satisfy the insulation and acoustic performance mineral wool would be applied into space between the finishing materials. One hour fire resistance is essential when the steel framed house is utilized to the building beyond fourth stories and multi-house occupancy. The purpose of this paper is to show the possibility to expect one hour fire resistance after reviewing the fire resistance performance caused from heat transfer analysis using FEM and that came from load-bearing fire tests, respectively. The surface temperatures from analysis with the models consisted of 140SL10 filled with mineral wool fully and partially and without mineral wool and two layer of fire resistance gypsum boards showed below the allowable temperature, 538℃ and the fire tests conducted using specimens made of the same structure used to analysis showed over 1 hour.

고온 시의 구조내력 평가를 위한 SM 400강재의 고온 특성 평가 연구

권인규 한국화재소방학회 2013 한국화재소방학회논문지 Vol.27 No.4

Recently, the risk of fire outbreak is going up because of newly developed combustible materials are intended to apply more. Especially the steel framed structure can lose its load-bearing capacity when it is exposed to higher temperature condition such as a fire. So the pre-evaluation of fire resistance of the structure is very essential that the mechanical properties of yield strength and elastic modulus and thermal properties such as conductivity and linear expansion be required. To get the databases for SM 400 or welding structural steels at high temperature, various temperature conditions were used for deriving the yield strength, elastic modulus, linear expansion, and conductivity and the results were compared to those of SS 400, ordinary structural steel, respectively. 건축물에서의 화재 발생은 인명피해, 구조물 피해 등 재해적 요소를 많이 포함하고 있으며, 가연물의 증가에 따라화재 발생빈도수와 피해 규모는 점차 증대하는 추세이다. 특히 강재로 구성되는 기둥부재와 보부재의 고온 시 내력의급격한 감소는 구조물의 붕괴와 같은 매우 위험한 상황에 도달될 수 있으므로 화재 시 강구조 건축물의 구조 안전성확보를 위해서는 적용 강재의 신뢰성 있는 고온 물성자료가 매우 중요하다. 따라서 본 연구에서는 강구조 건축물에서많이 활용되는 용접구조용 강재인 SM 400강재를 대상으로 고온 시 항복강도, 탄성계수를 측정하여 내력평가에 활용할수 있는 실험식을 제시하고, 화재 시의 온도평가와 응력 계산에 요구되는 열전도율과 열팽창계수 등의 열적 특성의 자료를 제시한다. 또한 일반 구조용 강재인 SS 400과의 고온 특성을 비교, 평가함으로써 고온에서의 내력 특성을 확인한다.

내화보드류와 강재단면형상계수를 이용한 강재기둥 공법개발 및 내화성능평가 연구

권인규 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.3

In domestic, the determination for thickness of fire protection materials of steel column has been conducted by using of one size of steel column, H-300×300×10×15, since the early 1990's with the critical temperature, 350℃ as a performance criterion. But there have been something problems when the thicknesses of fire protection materials that were chosen through fire tests for getting an approval from fire authorities was used to a real structural column. One is that some columns are needed overprotected, which is inclined to leading much cost of construction and resulting in less effectiveness in contrast to concrete based construction, the other is that there is absent of fire safety of building where in deed the fire protection material is needed more than that approved from fire tests. To make the new determination method of thickness for fire boards covered at steel columns, we utilized a new process including a section factor and the new criterion of performance of fire resistance for the small specimens in 1 meter covered fire boards that was chosen between a critical temperature from life-size loaded column in 3.5 meters and that being defined at KS F 2257-7 in 538℃. To demonstrate and make a new equation for determination of thickness of fire board, we carried out 4 times fire test with full-size specimens and 8 times with small-size specimen consisted of H-sections and square rectangular sections, respectively. With several fire test data, we can derived a FR = 63.25 - 0.24Hp/A + 2.76t (R=0.99) for a gypsum board and FR= 41.30 - 0.1Hp/A + 2.52t(where FR: Fire resistance(mins), Hp: Heated parameter, A :Area of Section, t: thickness of fire material(mm)) for a CRC board, respectively

해석적 방법에 의한 TMC 건축용 내화강재 적용 보부재의 고온 내력평가 연구

권인규 한국화재소방학회 2017 한국화재소방학회논문지 Vol.31 No.6

화재 발생 시 강구조 건축물은 재료의 급격한 강도저하에 따른 처짐과 내력저하로 구조물의 붕괴가 발생될 수있다. 따라서 구조용 강재의 고온 시 강도저하의 최소화 및 강판 두께 차이에 따른 설계기준강도 차이의 해결과 용접성을 향상하기 위한 필요성이 제기되었으며, 이 결과 TMC 건축용 내화강재가 개발되었다. 본 연구에서는 TMC 건축용 내화강재의 고온 시 구조내력을 평가하기 위하여 일정 길이의 보부재를 대상으로 단순지지 및 고정단 보 조건으로 처짐과 최대내력 변화를 해석적으로 도출하였으며, 건축용 내화강재와 그 성능을 비교분석하였다. 그 결과, TMC건축용 내화강재를 적용한 보부재가 내화강재 적용 보부재보다 고온 시 구조적 성능이 다소 열위임을 확인하였다. Steel framed building can be destroyed due to deteriation of structural stabilities in a fire. This leads a TMC Fire ResistantSteels and this study analyzed the structural stabilities such as a deflection and a reduction of maximum load capacity forthe structural beams built with a TMC Fire Resistant Steel. In this study the structural stabilities were evaluated using amechanical properties in high temperatures not only a heat transfer theory but a heat stress anlaysis with a statisticallydeterminated beam and a statistially indeternated one. The results showed that a TMC Fire Resistant Steels demonstrated alittle lower those of Fire Resistant Steels.

TMCP 내화강재의 고온 내력 평가 연구

권인규 한국화재소방학회 2013 한국화재소방학회논문지 Vol.27 No.6

Fire resistance steel, grading 490 MPa, had developed by using Thermo-mechanical control process (TMCP) and it has better performance at welding, seismic resistance than those of the ordinary structural steel, But the fire resistance performance is required to verify against the ordinary fire resistance, FR 490. Therefore this study was done to make database of mechanical properties at high temperature and to evaluate the structural stability at high temperature in terms of materials and structural member such as H-section from that of FR 490. The result of this study was that the structural stability of TMCP was lower than that of ordinary FR 490 at the range up about 700 oC. 대형화, 초고층 및 고스팬에 부응하기 위한 강재 기술개발의 노력으로 용접성능과 내진성능 그리고 내화성능이 부여된새로운 강재인 Thermo-mechanical control process (TMCP) 내화강재가 개발되었다. TMCP 내화강재는 기존의 내화강재 생산과정 시 압연과 동시에 정밀한 열처리를 병행함으로 인장력과 용접성을 향상시킬 수 있는 새로운 기술인 TMCP 방법으로 개발되었으며, 화재와 같은 고온에서의 구조적 안전성에 관한 내력평가가 요구되었다. 따라서 본 연구에서는고온 시 TMCP 내화강재의 내력평가를 목적으로 고온 시 항복강도, 탄성계수를 평가하고 각각에 대한 온도영역별 실험식을 제시하였으며, 이를 일반 내화강재의 고온 특성과 비교, 분석하였다. 또한 각각의 소재로 설정된 H형강 기둥부재를대상으로 고온 시의 내력을 계산하여 그 안전성을 확인한 결과, TMCP 내화강재의 고온 시 내력특성은 일반강 내화강재의 고온 내력저하 특성보다 열위인 것으로 나타났다.

온도해석과 재하가열시험에 의한 콘크리트 충전 보부재의 내화성능평가에 관한 연구

권인규 한국화재소방학회 2010 한국화재소방학회논문지 Vol.24 No.6

Major structural elements such as columns and beams are designed to withstand the vertical and horizontal loads. Futhermore, when the structural elements were engulfed with fire the structural stability should be stand without failure. The beams have been developed in aspects of structural stability but an evaluation of fire performance was not done. So the data of fire resistance performance of beams filled with concrete at web on H-section is not known. The purpose of this paper is to analyse the correlation between temperature analysis and fire test with the beams and to show the fire resistance performance with two methods. 건축 구조물의 주요 구조부는 중력하중의 전달과 수평하중을 견디도록 설계, 시공되어야 함을 물론이고,화재의 고열환경에서 부수적으로 발생되는 온도에 의한 추가하중을 지지하도록 설계되어야 한다. 강구조건축물에서의 보부재는 중력 및 횡력 방향의 하중에 더 강한 지지력을 확보하기 위하여 H형강 웨브부분에 콘크리트를 충전하는 타입의 개발 및 적용이 이루어져 왔으나, 내화성능의 평가는 거의 이루어지지 않은 상태이다. 따라서 본 논문에서는 H형강 보부재의 웨브에 일반강도의 콘크리트로 충전된 시험체를 대상으로 열전도 해석에 의한 내화성능과 재하가열시험을 통한 내화성능을 각각 제시하고 상관성을 비교분석하였다