外伸端板加劲肋对连接性能的影响

为考察外伸端板连接中不同端板加劲肋对节点性能的影响，采用接触问题的弹塑性大变形有限元分析方法，研究了钢梁柱外伸端板连接中不同长度和厚度的外伸加劲肋对节点刚度、承载力的影响，考察了端板变形和连接面受拉侧间隙的变化。研究发现，与梁腹板等厚的等边加劲肋会过早地拉剪屈服，受压侧加劲肋则过早屈服和屈曲。斜角为63.4°，加厚的加劲肋能增大节点的抗弯力臂，减小螺栓拉力，延迟梁受压翼缘的局部屈曲，并能够将梁端塑性铰移向加劲肋的尾部，从而明显提高端板连接节点的强度和刚度。

Effects of End plate Stiffener on Behavior of Extended End-plate Beam-to-column Connections

In order to analyze the influences of different stiffeners on joint performances in extended end plate connections, the finite element method with large and elasto-plastic deformation, suited to contact problems, was used. Effects of the size of extended end-plates and backing plates for column flange on rotational stiffness and resistance of the beam to column connection are studied. Developments of end-plate deformation and departure from each other between end plate and column flange were studied. It is found that the equilateral triangular stiffener with the beam web thickness will yield and/or buckle prematurely. When the stiffener angle is 63.4°, it can increase arm length against bending of the connection, thus reducing bolt tensile force, delaying the local buckling of beam compressive flange and forcing the beam plastic hinge to the end of the stiffeners, therefore such stiffeners enhance strength and stiffness of the connection significantly.