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方钢管混凝土柱的抗火性能与设计是其在工程实践中的关键问题之一,因而众多国内外学者对此进行了研究。但是,现有研究及其成果和现行规范或规程大多假设其四面均匀受火,而实际火灾中方钢管混凝土柱也可能存在单面、两面及三面等非均匀受火边界。受火边界的改变,使非均匀受火的方钢管混凝土柱受力机制和抗火性能与四面受火情况有所不同。为此,研究了一种典型非均匀受火边界,即相对两面受火条件下方钢管混凝土柱的抗火性能,在大量参数分析的基础上,提出了相对两面受火时方钢管混凝土承载力影响系数的简化公式,可用于评估该火灾条件下方钢管混凝土柱耐火极限,以供工程实践参考。
The fire-resistance performance and design of square CFST columns are one of the key issues in engineering practice, and many scholars at home and abroad have studied it. However, the current research, its achievements and current norms or regulations assume that fire is evenly on all four sides and actual fire-affected CFST columns may have non-uniform fire boundaries such as single side, two sides and three sides. The change of the boundary of the fire makes the stress mechanism and the fire resistance performance of the square concrete filled steel tubular column with uneven fire different from the fire situation on all sides. For this reason, a typical non-uniform fire boundary is studied, that is, the fire resistance of concrete filled steel tubular columns under opposite fire conditions. Based on a large number of parameters, the bearing capacity of concrete filled square steel tube The simplified formula of the coefficient can be used to evaluate the fire resistance of concrete filled steel tubular columns below the fire conditions for engineering practice.