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双角钢节点经常用于钢框架结构中,当火灾发生时,这些节点在结构构件间的荷载传递上起着至关重要的作用。对火灾下螺栓连接双角钢节点的响应还缺乏了解。采用有限元程序ANSYS,对栓接双角钢节点的抗火性能进行数值研究。分析中,考虑了材料和几何非线性,钢材的高温特性和非线性接触交互作用。通过与其他文献的试验结果进行对比,对该模型进行验证,并通过参数研究量化临界因素对螺栓双角节点的影响。结果表明:螺栓孔的大小、边距、热梯度和梁腹板的细长度对栓接双角钢节点的抗火性能影响很大。
Double angle joints are often used in steel frame structures and these nodes play a crucial role in the load transfer between structural members when a fire occurs. Lack of understanding of the response to bolted double-angle steel joints under fire. The finite element program ANSYS was used to numerically study the fire resistance of bolted double angle steel joints. In the analysis, the material and geometrical nonlinearities were considered, the high temperature characteristics of steel and the nonlinear contact interaction. By comparing with the experimental results of other literatures, this model is verified, and the influence of the critical factors on the double-angle joints of bolts is studied by parameters. The results show that the bolt hole size, margin, thermal gradient and beam web slenderness greatly affect the fire resistance of bolted double-angle steel joints.