建筑钢结构进展2025，Vol.27Issue(3)：38-45,8.DOI:10.13969/j.jzgjgjz.20240111001
典型局部火灾场景下钢梁的CFD-FEM耦合研究
Coupled CFD-FEM Simulation Methodology for Steel Beams Under Typical Localized Fire
摘要
Abstract
For localized fire,it is necessary to consider the thermal and mechanical response of building elements under uneven heating.The object of this paper is a square steel tube beam,simulating its thermomechanical phenomena under the flame impact on its bottom at different heights.Instead of applying the concept of adiabatic surface temperature to realize the one-way iterative coupling of fluid-solid heat transfer,this paper proposes a new computational fluid dynamics-finite element method(CFD-FEM)simulation methodology to realize the two-way direct coupling of fluid-solid heat transfer.In this direct coupled form,the fire model and the thermal model are addressed together by CFD method.Firstly,the accuracy of the numerical method is verified by a typical local fire test.Then,the distribution of the velocity and temperature fields is investigated in the fire model.The variation of the surface heat flux of the steel beams at different heights and the variation of the radiative and convective heat flux with time are investigated in the thermal model.Following this,the structural model analysis is completed using the solid temperature as the boundary condition to achieve thermal-mechanical coupling in the solid domain.The mechanical response of steel beams at different heights in this local fire condition is discussed,and the degradation of yield strength after heating is found.关键词
计算流体力学/局部火灾/流固传热/钢梁/热力耦合/热流Key words
computational fluid dynamics/localized fire/fluid-solid heat transfer/steel beam/thermal-mechanical coupling/heat flux分类
建筑与水利引用本文复制引用
周靖罡,王伟,周晅毅,丛北华..典型局部火灾场景下钢梁的CFD-FEM耦合研究[J].建筑钢结构进展,2025,27(3):38-45,8.基金项目
国家自然科学基金(52078380、51820105013),土木工程I类高峰学科建设经费(2022-3-YB-18) （52078380、51820105013）
