4、能的影响及不同截面钢管混凝土柱耐火性能的差异性,分别以荷载比和截面形式为参数,选择建立典型模型,分析各参数下算例的轴向和侧向变形、应力及应变的分布与发展。分析结果表明,火灾荷载比越大,耐火极限越小;组合柱较单肢柱,连接部分是防火薄弱环节,在一定防火措施下,组合柱的受力性能较好。关键词:新型方钢管混凝土组合柱,火灾试验,温度场,耐火极限,数值分析IABSTRACTSpecial-shaped column composed of concrete-filled square steel tubes (SCFST), such as L-shaped, T-shaped or Crisscross
5、-shaped, consist of a number of concrete-filled square steel tubes connected by connecting plate and ribbed slab, which havegooddevelopmentprospectin the steel residential building system. As the researchontheresistanceperformanceof compositecolumnisrare, theambiguityoffire-proofmaterialmeetingthe r
6、equestoftheassemblageresidentialbuildinghas beenthemosturgentproblemtobesolvedinthepopularizationofsteelresidentialbuilding. Based on the experimental research and numerical analysis for fire performance of SCFST column, the main contents of this paper are as follows:(1) Fire experiments were carrie
7、d out on three full scale L-shaped SCFST columns. Through the typeselectionoffire-proofmaterials,calcium silicate board and ceramic fibre felt are selected as the fire-proof materials for the cover of