Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

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An Analytical Study on Composite Beam Performance with Post-Fire Temperature Using ANSYS Program

ANSYS를 이용한 화재 후 온도에 따른 합성보 성능에 관한 해석적 연구

  • Kwak, Sung-Shin (Department of Architectural Engineering, Kyonggi University Graduate School) ;
  • Choi, Byong-Jeong (Department of Architectural Engineering, Kyonggi University Graduate School)
  • 곽성신 (경기대학교 일반대학원 건축공학과) ;
  • 최병정 (경기대학교 일반대학원 건축공학과)
  • Received : 2018.10.29
  • Accepted : 2019.01.04
  • Published : 2019.01.31
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Abstract

In the case of fire, a structure loses its original stiffness due to the temperature rise, and the load bearing capacity decreases. The loss of structural strength increases with increasing fire time of the structure. To prevent the collapse of buildings, it is very important to understand whether or not the members are damaged. On the other hand, there is insufficient data to be a guideline for diagnosing and evaluating the residual strength of the members in Korea. Therefore, this study examined the resistance performance by Finite-Element-Analysis of composite beams, which are composite structures among structural members. Composite beam modeling was carried out based on the model used in the Electrical Penetration Room (EPR) in cooperation with KEPCO. The heat transfer analysis and structural analysis of the critical phase were performed using ANSYS, a finite element analysis program. ANSYS was used to perform heat transfer analysis and structural analysis at the static analysis. To analyze the residual performance, the temperature distribution of the composite beam and the maximum displacement result of the heat-affected structure analysis were derived and the experimental data and the structural analysis result data were compared and analyzed.

화재발생 시 구조물의 부재는 온도상승에 의하여 본래의 강성을 잃게 되어 하중 지지력이 감소하게 된다. 구조 부재에 급격한 내력 상실은 구조물의 붕괴 및 인명 피해로 이어질 수 있다. 구조물의 화재 시간이 길어지게 되면 구조 부재에 대한 내력 상실은 더욱 증가하게 된다. 건축물의 붕괴를 방지하기 위하여 부재 손상 여부의 파악은 매우 중요한 과제이나 국내에서 부재의 잔존내력을 진단하고 평가하는 지침이 될 만한 자료는 미비한 실정이다. 따라서 본 연구는 구조 부재 중 합성구조인 합성보를 유한요소해석을 통하여 내화성능을 분석하고자 한다. 합성보 모델링은 한국전력기술의 협조를 받아 원자력 발전소 보조건물(Electrical Penetration Room, EPR)에 사용되는 도면을 바탕으로 수행하였다. 유한요소해석 프로그램인 ANSYS를 이용하여 정해석 단계의 열전달 해석과 구조해석을 수행하였다. 열전달 해석 결과로 얻어진 온도분포를 데이터로 확보하여 구조해석에 열전달해석 결과를 반영시켰다. 잔존성능을 분석하기 위하여 합성보의 온도분포와 열 영향을 받은 구조해석의 최대변위 결과를 도출하여 실험 결과 데이터와 구조해석 결과 데이터를 비교분석하였다.

Keywords

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Fig. 1. Analysis procedure using ANSYS 19.2

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Fig. 2. Analysis process for the interpretation of results

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Fig. 3. Dimensions of Composite Beam Modeling

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Fig. 4. Mesh Quality of Composite Modeling

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Fig. 5. Mechanical and thermal properties of Steel

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Fig. 6. Mechanical and thermal properties of Concrete

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Fig. 7. Thermal Conductivity of Fire Protection at elevated Temperatures

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Fig. 8. Experimental heating furnace appearance

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Fig. 9. ANSYS Program heat transfer analysis condition

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Fig. 10. Thermal analysis results Protected Composite beam

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Fig. 11. Thermal analysis results Unprotected Composite beam

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Fig. 12. Slab temperature for each specimen according to position

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Fig. 13. Comparison of Heat Transfer Analysis Results and Experimental Results

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Fig. 14. Importing thermal analysis to structur alanalysis

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Fig. 15. Position of load and displacement measurement

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Fig. 16. Load direction displacement contour

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Fig. 17. Load-displacement curve of actual experiment

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Fig. 18. Comparison of initial stiffness between analysis results and experimental results

Table 1. Variable Condition of Composite Modeling

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Table 2. Mechanical and thermal properties of steel applied to Engineering Data at room temperature

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Table 3. Mechanical and thermal properties of Concrete applied to Engineering Data at room temperature

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Table 4. Mechanical and thermal properties of Fire Protection applied to Engineering Data at room temperature

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Table 5. Slab temperature for each specimen

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Table 5. Maximum displacement according to maximum load

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