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为研究T型钢连接梁柱节点的抗火性能及破坏模式,使用垂直抗火试验炉,采用恒载升温方式,对4个十字形足尺钢框架T型钢半刚性节点进行抗火试验。试验主要考察T型钢厚度、高强螺栓直径和楼板等因素对节点抗火性能的影响。试验过程中对节点的温度发展和变形情况进行测量,并对钢梁的位移-时间曲线进行分析。结果表明:火灾下T型钢节点的破坏模式主要取决于T型钢和高强螺栓间的相对承载力,承载力相对弱的部分将先发生破坏;混凝土楼板可以较大幅度地提高节点的抗火性能,高强螺栓直径和T型钢壁厚对节点的抗火性能影响不显著;T型钢节点刚度和抗弯承载力在温度升高到500℃~650℃之前无明显变化,之后迅速下降。
In order to study the fire resistance and failure modes of T-beam connected beam-column joints, four vertical cross-section steel T-beam semi-rigid joints were tested by vertical fire resistance furnace and constant temperature load. The test mainly examines the influence of the thickness of the T-shaped steel, the diameter of the high-strength bolt and the slab on the fire-resistant performance of the joint. During the test, the temperature development and deformation of the joint were measured, and the displacement-time curve of the steel beam was analyzed. The results show that the failure mode of T-steel joints under fire mainly depends on the relative bearing capacity between T-beams and high-strength bolts, and the relatively weak bearing capacity will be destroyed first. Concrete slabs can greatly improve the fire resistance of joints, The effect of high-strength bolt diameter and T-shaped steel wall thickness on the fire resistance performance of joints is insignificant. The stiffness and flexural capacity of T-shaped steel joints did not change significantly until the temperature increased from 500 ℃ to 650 ℃, and then decreased rapidly.