火场-结构联合分析简化模型及其应用研究

为在建筑结构火灾反应分析中考虑实际火场特性，并简化火场分析模型与结构有限元分析模型之间的复杂对应关系，提出并建立了火场温度及对流辐射边界的热传导分析时空模型(STM)和基于时空模型的火场-结构联合分析方法。该方法根据火场模型计算出室内火场温度分布场以及对流辐射边界场离散数据，通过双向正交多项式进行拟合来得到不同时刻的构件边界连续时空模型，再通过时空模型进行热传导分析和热力耦合分析，从而实现火场-结构联合分析方法。在验证其合理性的基础上，通过ABAQUS子程序UTEMP和DFLUX实现其分析过程，并进行了北京某档案馆工程的应用分析，结果表明该方法可以较好地联合火场模拟与结构分析用于结构火灾安全评价。

A Simplified Model for Coupled Fire-Structure Analysis and Its Application

To consider the actual fire characteristics in the fire response analysis of building structures and simplify the complex relationship between the fire analysis model and the structural finite element analysis model,a spatio-temporal model of fire temperature and heat flux boundary for heat conduction analysis was developed.The model adopted the 2-way orthogonal polynomial approach to fit the discrete data from fire simulation and obtained the continuous spatial polynomial equations,which was proved to be accurate for capturing the distribution of temperature and heat flux required in heat conduction analysis and thermo-mechanical coupling analysis.Finally,the model was applied through user subroutines UTEMP and DFLUX in ABAQUS to the fire resistance analysis of a new archive building in Beijing.The results show that this method can be used to combine fire simulation and structural analysis for safety evaluation of structures under fire.