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通过对３个方钢管混凝土柱按１９１８３４和ＧＢ９９７８－８８规定的标准升温曲线升温作用下耐火极限的试验，研究带保护层情况下方钢管混凝土柱的耐火性能和耐火极限。试验研究结果表明，火灾下方钢管混凝土柱的性能和圆钢管混凝土柱类似。由于钢管和混凝土的共同工作，且核心混凝土具有较好的吸热性能，从而使方钢管混凝土柱具有较好的耐火性能，在柱子外围只需进行适当的防火涂料保护，即可达到《ＧＢ５００４５－９５高层民用建筑设计防火规范》对柱结构所要求的耐火极限。分析结果还表明，钢结构柱防火保护层厚度的确定方法，不适合于方钢管混凝土柱。研究成果可为有关方钢管混凝土工程防火设计提供参考。
The fire resistance and fire resistance of the concrete filled steel tubular column with protective layer were studied by testing the three concrete-filled square steel tubular columns under the standard temperature-rising curves of 191834 and GB9978-88. Experimental results show that the performance of CFST columns under fire is similar to that of CFST columns. As the steel pipe and concrete work together, and the core concrete has a good endothermic performance, so that the square steel tube concrete column has better fire resistance in the column periphery only need appropriate fire protection coatings, you can achieve “GB50045- 95 high-rise building design code for fire protection ”column structure required fire resistance. The analysis results also show that the method of determining the thickness of fire protection layer of steel structure column is not suitable for the square steel tube concrete column. The research results can provide a reference for the fire protection design of CFST.