【摘要】 设计制作了4个钢-混凝土组合梁与钢柱之间齐平式端板连接组合节点试件,完成了其在无轴力、梁端承受轴向拉力10%N by、20%N by和受轴向压力10%N by情况下受往复弯矩荷载作用的拟静力试验,研究试件的抗弯刚度、承载力、延性、滞回性能、耗能能力和破坏模式等。结果表明:梁端轴向拉力加剧了试件的变形和破坏,使其承载力、刚度及耗能能力等均有一定程度的降低,并且随着拉力的增大降低幅度增大;梁端轴向压力在前期延缓试件变形及破坏,但当试件变形较大时,压力产生的二阶效应将使试件提前破坏,试件的刚度和承载力退化较快;无论梁端存在轴向拉力还是压力,试件的延性均有明显降低,其总耗能能力下降。更多还原

【Abstract】 Only bending moment and shear force at beam end are commonly considered in designing beam-to-column connections.However,axial force at beam end has to be taken into account in some cases.Four flush endplate composite connections between steel-concrete beam and steel column were designed,fabricated,and tested.The specimens were subjected to reverse bending under separately no axial force,10% of N by tension force,20% of N by tension force and 10% of N by compression force at beam end.The seismic behaviors,such as stiffness,bearing capacity,ductility,hysteretic behavior,energy dissipation capacity and failure modes,etc.,were studied.The results indicate that beam end axial tension force can intensify the deformation and damage of the specimens,and reduce the bearing capacity,stiffness and energy dissipation capacity and so on;however,the compressive force can delay the deformation and damage of connections in early stage,and accelerates the damage of specimen as the deformation increasing;regardless of the beam end force is axial tension or compression,the ductility of the specimens are significantly decreased,and the total energy dissipation capacity declines.更多还原