A new element elimination model to predict fire-induced damage on an underground structure

요소제거기법을 적용한 지하구조물의 화재손상 예측모델 개발

  • 장수호 (한국건설기술연구원 지하구조물연구실) ;
  • 최순욱 (한국건설기술연구원 지하구조물연구실, 연세대학교 대학원) ;
  • 배규진 (한국건설기술연구원 지하구조물연구실) ;
  • 안성율 ((주)사이텍이엔씨)
  • Published : 2008.12.26

Abstract

Thermo-mechanical coupled behavior of an underground structure during a fire accident have not been fully understood yet. Moreover, when such a thermo-mechanical coupled behavior is not considered in numerical analyses based on conventional heat transfer theory, fire-induced damage zone in an underground structure can be considerably underestimated. This study aims to develop a FEM-based numerical technique to simulate the thermo-mechanical coupled behavior of an underground structure in a fire accident. Especially, an element elimination model is newly proposed to simulate fire-induced structural loss together with a convective boundary condition. In the proposed model, an element where the maximum temperature calculated from heat transfer analysis is over a prescribed critical temperature is eliminated. Then, the proposed numerical technique is verified by comparing numerical results with experimental results from real fire model tests. From a series of parametric studies, the key parameters such as critical temperature, element size and temperature-dependent convection coefficients are optimized for the RABT and the RWS fire scenarios.