고온과 편심 축하중을 받는 세장한 철근 콘크리트 기둥의 유한요소해석
Finite Element Analysis of Slender Reinforced Concrete Columns Subjected to Eccentric Axial Loads and Elevated Temperature
0
조회
0
다운로드
1
인용
0
참고문헌
키워드
초록
본 논문에서는 유한요소해석 프로그램 Abaqus를 이용하여 고온과 편심 축하중을 받는 세장한 철근 콘크리트 기둥의 유한요소해석절차를 제시하고 해석 결과를 비교･분석하였다. 기둥에 축하중과 화재가 가해지는 상황을 해석에 반영하기 위해 Abaqus에서 제공하는 순차 결합 열-응력 해석을 사용하였다. 우선 콘크리트 단면에 대한 열전달 해석을 수행하여 검증한 뒤, 이를 3차원 요소로 확장하고구조해석과 결합하여 해석을 수행하였다. 해석 과정에서 수렴성 및 정확성에 영향을 미치는 인장 증강 효과와 초기 불완전성을 고려하여 모델링하였다. 해석 결과는 74개 실험 데이터와 비교하였으며, 내화시간을 기준으로 평균 6%의 오차를 나타냄에 따라 유한요소해석을 통해 철근콘크리트 기둥의 내화성능을 예측할 수 있게 되었다.
Abstract
In this study, slender reinforced concrete columns subjected to high temperatures and eccentric axial loads are evaluated by finite elementanalysis employing Abaqus (a finite element analysis program). Subsequently, the analysis results are compared and assessed. Thesequentially coupled thermal stress analysis provided by Abaqus was employed to reflect the condition of an axially loaded column exposed tofire. First, heat transfer analysis was performed on the column cross-section. After verifying the results, another analysis was conducted: thecross-section was transformed into a three-dimensional element and then structural analyzed. In the analysis process, the column was modeledby accounting for the effects of tension stiffening and initial imperfection that could affect convergence and accuracy. The analysis resultswere compared with 74 experimental records, and an average error of 6% was observed based on the fire exposure and resistance. Theforegoing indicates that the fire resistance performance of reinforced concrete columns can be predicted through finite element analysis.
참고문헌 (14)
- Abaqus, "Abaqus Analysis User’s Guide", Dassault Systems Simulia Corp, ~ (2016)
- Alogla, S, "Quantifying Transient Creep Effects on Fire Response of Reinforced Concrete Columns", Eng. Struct, 174, pp.885~895 (2018)
- Carreira, D.J, "Stress-Strain Relationship for Plain Concrete in Compression", J. Am. Concr. Inst, 82(6), pp.797~804 (1985)
- CEN, "EN. 1992-1-2 Eurocode 2 : Design of Concrete Structures - Part 1-2 : General Rules – Structural Fire Design", Europeon Committee for Standardization, ~ (2004)
- CEN, "EN. 1993-1-2 Eurocode 3 : Design of Steel Structures - Part 1-2 : General Rules – Structural Fire Design", Europeon Committee for Standardization, ~ (2005)
- Chinthapalli, H. K, "Fire Behavior and Modeling of Short RC Columns in Pure Axial Compression : Role of Volume, Configuration, and Spacing of Lateral Reinforcement", J. Struct. Eng, 148(1), pp.885~895 (2022)
- Espinos, A, "Advanced Model for Predicting the Fire Response of Concrete Filled Tubular Columns", J. Constr. Steel Res, 66(8-9), pp.1030~1046 (2010)
- Gernay, T, "Fire Resistance and Burnout Resistance of Reinforced Concrete Columns", Fire Safety J, 104, pp.67~78 (2019)
- Hillerborg, A, "Analysis of Crack Formation and Crack Growth in Concrete by Means of Fracture Mechanics and Finite Elements", Cem. & Concr. Res, 6(6), pp.773~781 (1976)
- Huang, Z. F, "Rankine Approach for Fire Resistance of Axially-and-Flexurally Restrained Steel Columns", J. Constr. Steel Res, 59(12), pp.1553~1571 (2003)
- IBC, "International Building Code" (2021), International Code Council
- ISO, "ISO 834:1975 Fire Resistance Tests-Elements of Building Construction", International Organization for Standardization, ~ (1975)
- Lie, T.T, "Fire Resistance of Reinforced Concrete Columns : Test Results", pp.302~ (1988), National Research Council Canada, Institute for Research in Construction
- Tan, K. H, "Experimental Behavior of Restrained Reinforced Concrete Columns Subjected to Equal Biaxial Bending at Elevated Temperatures", Eng. Struct, 56, pp.823~836 (2013)