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通过8个组合柱短试件的温度场测试和10个组合柱长试件的耐火性能试验,研究了ISO 834标准升温曲线下型钢-钢管混凝土柱的温度场分布和耐火极限。试验参数包括截面形状、受火方式、轴压比和配骨率。试验结果表明:配置型钢后钢管混凝土柱截面内升温速率会略有提高,内置型钢对截面温度场分布影响不大,但是钢管混凝土柱的耐火极限会大幅度提高;以四面受火的方形截面试件的耐火极限为参照,三面受火时耐火极限变化不大,两面受火和单面受火时耐火极限大幅度提高,圆形截面试件1/2表面受火时耐火极限亦明显提高;轴压比从0.3增大到0.4时,试件耐火极限显著降低。经过合理的设计,无防火保护的型钢-钢管混凝土柱可以达到3 h的一级耐火极限要求。
The temperature field distribution and fire resistance of profiled steel-concrete filled steel tubular columns under ISO 834 temperature rise curve were studied through the temperature field test of 8 composite column short specimens and the fire resistance test of 10 composite column length specimens. Experimental parameters include cross-sectional shape, fire exposure, axial compression ratio, and bone-setting rate. The test results show that the temperature increase rate of the section of CFST column will be slightly increased after the section steel is arranged and the built-in section steel has little effect on the temperature field distribution of the section, but the fire resistance limit of the CFST column will be greatly increased. Refractory limit for the reference, the fire resistance changes on both sides of the fire is not big, both sides by the fire and single fire resistance greatly increased when the fire, the circular cross-section test specimen 1/2 fire resistance limit was also significantly improved; Axial pressure ratio increased from 0.3 to 0.4, the specimen significantly reduced fire resistance. After a reasonable design, non-fire protection of steel - concrete-filled steel columns can reach the first class 3h fire resistance requirements.