复杂空间钢结构整体性防火分析的系统方法研究

A study of systems methodology for whole structural fire resistance of complex spatial steel buildings

复杂空间钢结构建筑的飞速发展为结构防火分析和设计带来了新的挑战。在分析现有规范和性能化设计方法中结构防火设计不足的基础上,基于火灾科学、结构工程、计算机模拟等多个学科领域的知识和研究成果,立足于复杂空间建筑的整体防火性能模拟与分析的理论研究和实际应用,建立空间整体结构火灾-结构耦合分析模型和系统集成方法,提出复杂空间结构整体性防火分析的系统分析模型,并进行实例研究。该系统分析模型综合考虑实际火灾的发展蔓延过程以及火灾对结构体系的影响,研究建筑火灾中火场状况与空间结构体系之间的相互关系,对大空间建筑在各种火灾场景下的结构反应进行仿真模拟,从而进行整体性系统化的分析和评估。本课题的研究在理论分析的基础上为结构整体防火分析提出了新的手段和思路,可为我国建筑防火研究和建筑防火设计、消防救援、应急预案制定等工程实际应用提供有益的参考。

It is a new challenge to the fire safety design and analysis of large and high-rise buildings with complex spatial structures. Disadvantages of the traditional prescriptive and performance-based fire design methods were presented. The methodology and technology to simulate the mechanical response of whole structures exposed to fire was studied carefully. An overall view on performance-based code and a newly multi-dimensional integration systems methodology for whole structural fire resistance design were presented to assess the overall fire safety behavior of complex spatial structures under fire conditions. This system adopted a computer integration technology to perform structural fire safety analysis and assessment with the coupling thermal and mechanical effect considered. The case of a complex steel structure was studied using the systems methodology. The results indicate that complex spatial buildings under fire conditions behave a coherent entity. The case study demonstrated that whole structural analysis coupling with fire simulation is a powerful methodology and is advantageous when used to perform fire safety analysis.