Experimental and Analytical Investigations of the Fire Behavior of CFT Beam-Columns

CFT梁柱火灾性能的实验与分析研究

• 批准号: 0453913
• 负责人: Amit Varma
• 金额: --
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-08-16 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0453913&HistoricalAwards=false
• 关键词: Experimental; Analytical; Investigations; Fire; Behavior

Steel-concrete composite structures with concrete-filled steel tube (CFT) columns are an excellent candidate for fire resistant design due to their enhanced fire resistance resulting from the presence of concrete. Researchers at the National Research Council of Canada have conducted significant research on the fire resistance of CFT columns. However, these studies were firmly rooted in the current prescriptive fire-resistant design philosophy. Currently, there is a significant lack of knowledge of the fundamental force-deformation behavior of CFT beam-columns subjected to elevated temperatures due to fire loading. Knowledge of this force-deformation behavior will lead to performance-based guidelines for designing fire-resistant composite structures with CFT columns.The proposed research project provides experimental and analytical investigations in two areas: (1) the fundamental force-deformation behavior and (2) the influence of various material (steel yield stress and concrete strength) and geometric parameters (tube width and b/t ratio) on the behavior of CFT beam-columns subjected to elevated temperatures from fire loading. The experimental investigations will be conducted on large-scale CFT specimens using an innovative and specially designed test method. The analytical investigations will involve the development and validation of 3D finite element models for the thermal and structural (mechanics) behavior of CFT specimens under fire loading. The validated models will be used to conduct analytical parametric studies. The results from the experimental and analytical studies will be used to calibrate a macro fiber-based finite element for modeling CFTs that can be used to investigate the structural behavior of CFT frames under fire loading.

钢管混凝土柱(CFT柱)钢-混凝土组合结构由于混凝土的存在而提高了耐火性能，因此是一种很好的耐火设计方案。加拿大国家研究委员会的研究人员对钢管混凝土柱的耐火性能进行了重要的研究。然而，这些研究牢牢植根于当前规定的耐火设计理念。目前，对于钢管混凝土梁柱在高温下火灾荷载作用下的基本受力变形行为缺乏了解。对这种力-变形行为的了解将为钢管混凝土柱耐火组合结构的设计提供基于性能的指导原则。该研究项目在两个方面进行了试验和分析：(1)基本的力-变形性能；(2)不同材料(钢的屈服应力和混凝土强度)和几何参数(管宽和b/t比)对火灾高温下钢管混凝土梁柱性能的影响。试验研究将在大型钢管混凝土试件上进行，采用一种创新的、专门设计的试验方法。分析研究将包括开发和验证三维有限元模型，以研究钢管混凝土试件在火灾荷载下的热和结构(力学)行为。经过验证的模型将用于进行分析性参数研究。实验和分析研究的结果将被用来校准用于模拟钢管混凝土的宏纤维有限元，该有限元可用于研究钢管混凝土框架在火灾荷载下的结构性能。