Connections are the most vulnerable parts of a structure under fire conditions. A novel steel connection with high axial and rotational ductility has been proposed with the objective to improve the performance of steel-framed buildings in fire. Analytical model has been developed to determine the axial displacement of the top and bottom flanges of the beam end at high temperatures. A series of sub-frame models with this ductile connection have been built using Abaqus to study the influence of the characteristics of the connection part between the fin-plate part and face-plate part on the overall connection behaviour. The current critical failure mode of the ductile connection is bolt pull-out from the face-plate zone, and the tensile deformation capacity of the connection is not fully utilized. Therefore, measures to improve the bolt pull-out failure mode of the connection have been tested using the Abaqus sub-frame models, including adding a strengthening plate to the face-plate part of the connection and increasing the connection plate thickness. The simulation results show that the bearing failure of the beam web will become another critical failure mode of the connection, once the bolt pull-out failure is eliminated. To further optimize the high-temperature performance of the connection, the Abaqus steel frame models have also been used to test some measures to delay the occurrence of the beam web bearing failure, including adding strengthening plates to the part of the beam web in contact with the connection, and improving the material properties of the part of the beam web around the bolt holes at high temperatures.

连接是火灾条件下结构中最脆弱的部分。提出了一种具有高轴向和旋转延展性的新型钢连接，旨在提高钢框架建筑的防火性能。已经开发了分析模型来确定高温下梁端顶部和底部翼缘的轴向位移。使用 Abaqus 建立了一系列具有这种延性连接的子框架模型，以研究翅片部件和面板部件之间的连接部件特性对整体连接行为的影响。目前延性连接的关键失效模式是螺栓从面板区拔出，连接的拉伸变形能力没有得到充分利用。因此，利用Abaqus副车架模型试验了改善连接螺栓拔出失效模式的措施，包括在连接面板部分增加加强板、增加连接板厚度等。模拟结果表明，一旦消除了螺栓拉拔失效，梁腹的承载失效将成为连接的另一个关键失效模式。为了进一步优化连接的高温性能，Abaqus钢框架模型还被用来测试一些延缓梁腹板承载失效发生的措施，包括在梁腹板与梁腹板接触的部分添加加强板。并改善梁腹板螺栓孔周围部分在高温下的材料性能。