梁柱盖板连接的滞回性能研究

盖板加强式梁柱刚性连接节点是使塑性铰外移以提高节点塑性变形的一种改进形式。为了研究梁柱盖板连接的滞回性能,在考虑材料、几何和接触状态非线性基础上,采用三维实体单元对梁柱盖板连接进行了循环加载有限元模拟。设计了4组共12个试件,研究了节点域厚度、梁高、盖板长度及轴压比等参数对盖板连接滞回性能的影响。有限元分析结果表明:大部分节点表现出良好的延性,梁端位移超过80mm;节点域厚度越厚,连接的承载力和刚度越高;梁高越大,连接的延性越差,可能会发生强梁弱柱破坏;盖板长度对节点性能没有显著影响;轴压比越大,节点的强度、刚度和延性会显著降低。

Study on hysteretic behavior of beam-column cover plate connection

Cover plate(CP) reinforced steel moment resistant frame(MRF) connection is one of the details with potential plastic hinge moved outward from the beam and column interface.In order to study hysteretic behavior of beam-to-column cover plate connections,based on consideration of material,geometric and contact nonlinearity,finite element analysis for beam-to-column cover plate connections under cyclic loading is carried out.Three dimensional solid element is adopted in the connection models.The effects of joint panel thickness,beam height,cover plate length and axial compression ratio on hysteretic behavior of connections are studied.Finite element results reveal that major connections exhibit good ductile behavior;displacement of beam end exceeded 80mm.With increasing joint panel thickness,strength and stiffness of CP connections are higher.The ductility of CP connections worsens with possible failure pattern of strong beam and weak column,when the beam height becomes higher.Cover plate length slightly affected the behavior of CP connections.It is also found that when axial compression ratio of the column increases,strength,stiffness and ductility of CP connections significantly decreased.