腹板嵌入式钢–混凝土组合梁的抗火性能参数分析

Analysis of Fire Resistance Parameters of Web-Embedded Steel-Concrete Composite Beams

摘要: 为深入研究腹板嵌入式钢–混凝土组合梁的抗火性能，本研究构建了ABAQUS有限元分析模型，该模型在火灾高温环境下，通过实验数据验证可靠性。在此基础上，再对组合梁的载荷比、跨高比、钢筋直径、腹板厚度、受火面数等方面的影响进行了详细的考察。研究结果表明：荷载比随着荷载比的增加而逐渐降低组合梁的临界温度，对腹板内嵌钢混凝土组合梁的抗火性能有显著影响；在高温条件下，波纹腹板组合梁在临界状态下的挠度值随跨高比的增大而相应增大；另外，组合梁的临界温度也随着配筋率的增加，受火面数的增加，腹板厚度的增加而提高，使组合梁的抗火性能进一步增强。

Abstract: In order to further study the fire resistance of web-embedded steel-concrete composite beams, the ABAQUS finite element analysis model was constructed, which verified the reliability through experimental data in the high-temperature fire environment. On this basis, the influence of load ratio, span height ratio, steel bar diameter, web thickness, and number of fire surfaces of the composite beam was investigated in detail. The results show that the load ratio gradually decreases the critical temperature of the composite beam with the increase of the load ratio, which has a significant impact on the fire resistance of the composite beam with steel embedded in the web. Under the condition of high temperature, the deflection value of the corrugated web composite beam in the critical state increases with the increase of the span-height ratio. In addition, the critical temperature of the composite beam also increases with the increase of reinforcement ratio, the increase of the number of fire surfaces, and the increase of web thickness, so that the fire resistance of the composite beam is further enhanced.