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介绍了采用翼板式、柔性端板、平端板、腹板夹板和外伸端板这5种连接方式的约束钢梁柱节点共10个抗火试验结果。详细地描述了数值稳定性和结构性能的模拟方法,并比较了节点破坏模式、梁轴向承载力及中跨处挠度的ABAQUS数值模拟结果和试验结果。两者结果非常吻合,证实了用ABAQUS软件建立的有限单元模型可以预测实际情况的约束钢节点各阶段的结构抗火性能(包括限制梁的热膨胀及悬索效应)。可用该模型进行数值参数分析,以得到能更好地反映节点性能及其对钢框架耐火性影响的理论数据。
A total of 10 fire-resisting test results of the confined steel beam-column joints with 5 connection ways including wing plate, flexible end plate, flat end plate, web plate and overhanging end plate are introduced. The simulation methods of numerical stability and structural performance are described in detail. The ABAQUS numerical simulation results and experimental results of the joint failure mode, beam axial bearing capacity and midspan deflection are compared. The results agree well with each other. It is confirmed that the finite element model established by ABAQUS software can predict the structural fire resistance (including limiting the thermal expansion and cable effect of the beam) of the steel nodules in different stages of the actual situation. This model can be used for numerical parameter analysis to obtain theoretical data that better reflect node performance and its impact on the fire resistance of steel frames.