型钢-钢管混凝土柱耐火性能试验研究

发布时间：2018-05-01 00:05

本文选题：组合柱 + 钢管混凝土　；参考：《建筑结构学报》2016年03期

【摘要】：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。
[Abstract]:The temperature field distribution and fire resistance limit of steel tubular concrete filled steel tubular columns under ISO 834 standard heating curve were studied by measuring the temperature field of 8 short composite columns and the fire resistance tests of 10 long composite columns. The test parameters include section shape, fire mode, axial compression ratio and bone match ratio. The test results show that the heating rate of CFST columns will increase slightly after the steel section is configured, and the temperature field distribution of CFST columns will be slightly affected by the built-in section steel, but the fire resistance limit of CFST columns will be greatly increased. Taking the fire resistance limit of square cross section specimen with four sides of fire as reference, the fire resistance limit of three sides is not changed much, the fire resistance limit of two sides and one side is greatly increased, and the fire resistance limit of round section specimen with 1 / 2 surface fire is also obviously increased. When the axial compression ratio increases from 0.3 to 0.4, the fire resistance limit of the specimen decreases significantly. After reasonable design, the steel tubular concrete filled steel tubular column without fire protection can meet the first fire resistance limit requirement of 3 h.
【作者单位】：上海师范大学建筑工程学院;上海理工大学环境与建筑学院;
【基金】：上海市自然科学基金项目(11ZR1426400)
【分类号】：TU398.9

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