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基于一种新型钢框架连接节点——钢梁现场翼缘对接栓焊节点的半刚性性能,对其连接的钢框架进行非线性动力时程分析,探讨采用此新型节点的钢框架的动力特性。在计算模型中将栓焊节点简化为弹簧单元,采用有限元软件ANSYS研究连接刚度及不同地震波对钢框架模态、层间位移角、加速度、层间剪力等的影响,并与采用普通焊接节点的钢框架的动力性能进行对比分析。结果表明,采用此新型节点的钢框架的结构侧移值较焊接钢框架有所增加,但基底剪力值降低60.6%,层间剪力减小2~3倍。新型节点初始转动刚度小于普通焊接节点,因此钢框架的基本自振周期明显增大。综合分析结果,此新型节点是一种力学性能良好的节点,其连接的钢框架体系符合抗震要求,可应用于地震区域。
Based on the semi-rigid behavior of a new type of steel frame connection node-steel beam on-site butt joint, the dynamic analysis of the connected steel frame is carried out, and the dynamic characteristics of the steel frame adopting the new node are discussed. In the calculation model, the welding and bolting joints are simplified as spring units. The influence of connection stiffness and different seismic waves on the steel frame modes, interlayer displacement angle, acceleration and interlaminar shear force are studied by finite element software ANSYS. The dynamic performance of the steel frame of the node is compared and analyzed. The results show that the lateral displacement of the steel frame with this new type of joint is higher than that of the welded steel frame, but the base shear force decreases by 60.6% and the interlaminar shear force decreases by 2 ~ 3 times. The initial rotational stiffness of the new type of joint is smaller than that of ordinary welded joint, so the basic natural vibration period of the steel frame increases obviously. According to the results of the comprehensive analysis, the new node is a node with good mechanical properties. The steel frame system connected with it meets the seismic requirements and can be applied to the seismic area.