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为研究采用箱形节点域与工形柱连接的钢框架结构的抗震性能,对由工字形柱强轴与弱轴方向采用箱形节点域连接的2榀钢框架结构进行了低周反复加载试验。试验结果表明:强轴连接钢框架具有较高的承载能力及良好的滞回性能,破坏时梁端出现塑性铰;弱轴连接钢框架的承载力相对偏低,但具有优于强轴连接钢框架的变形能力,且在弹塑性变形阶段具有与强轴连接钢框架相近的耗能能力,破坏模式与强轴连接基本相同;两榀钢框架的位移延性系数在2~3之间;试验中两榀钢框架的节点域始终处于弹性工作阶段,均未发生屈服。这表明箱形节点域连接属于“强节点域”连接,达到了“强节点弱构件”的抗震要求。箱形节点域连接可以有效减小节点域的剪切变形,采用该连接进行工字形柱钢框架设计时,在抗震设计中可以忽略节点域剪切变形对层间位移的影响。
In order to study the seismic performance of steel frame structure connected by box node and work-piece column, low-cycle repeated loading test was carried out on 2 榀 steel frame structure connected by box node in the direction of strong axis and weak axis of I-shaped column . The test results show that the steel frame with high shaft connection has high carrying capacity and good hysteretic performance, plastic hinge appears at the end of the beam when damaged, the bearing capacity of the steel frame with weak shaft connection is relatively low, The deformation capacity of the frame is similar to that of the steel frame connected with the strong shaft in the elastic-plastic deformation stage. The failure mode is basically the same as the connection of the strong shaft; the displacement ductility coefficient of the two steel frames is between 2 and 3; The joints of the two steel frames are always in elastic working stage, and no yielding occurs. This indicates that the box node domain connection belongs to the “strong node domain” connection, which meets the seismic requirements of “strong node weak component”. The connection of box nodes can effectively reduce the shear deformation of the node domain. When using this connection to design the I-shaped column steel frame, the influence of node shear deformation on the interlayer displacement can be ignored in the seismic design.