梁柱螺栓连接节点刚度对装配式斜支撑钢框架结构受力性能影响研究

采用ANSYS有限元分析软件，对单榀单层纯钢框架、斜支撑钢框架和30层装配式斜支撑钢框架整体结构进行分析，结果表明，梁柱螺栓连接节点刚度对纯框架的构件内力、构件承载力、侧向位移、楼层刚度、自振特性、构件损伤率、极限荷载、结构破坏模式等影响较大，应按照节点实际连接刚度计算；对斜支撑框架的受力性能影响较小，可以按照节点刚性连接进行计算；对30层整体结构的影响与无斜支撑梁柱螺栓连接节点占总节点的比率有关，当比率小于4.2%且梁柱节点转动刚度达到3×10⁴kN•m•rad^-1以上时，可以按照节点刚性连接假定进行结构整体设计分析，无需修正。当不满足上述要求时，提出了先将梁柱螺栓连接节点简化为刚性连接计算，再对结构位移、周期、构件承载力等进行修正的简化分析方法。文中研究结果可为该结构体系的设计提供参考。

Study on effect of bolted beam-column joint stiffness onperformance of prefabricated steel frame structure

The finite element analysis for a one-story pure steel frame, a one-story frame with inclined braces and a 30-story structure were performed. Results show that the stiffness of the bolted beam-column joint has significant effect on the internal force of component, bearing capacity of component, lateral displacement, story stiffness, natural vibration characteristics, component damage ratio, ultimate load and failure mode of the pure frame. The joint should be calculated according to its actual stiffness. But, since the joint stiffness has little effect on the mechanical behavior of the frame with inclined braces, the joint could be taken as rigid connection. The effect on the 30-story structure is related to the ratio of the number of bolted beam-column joint without brace to the total number of the beam-column joints. When the ratio is less than 4.2% and the stiffness of beam-column joint reaches 3×10⁴kN•m/rad, the integral structure could be designed assuming that the bolted beam-column joints are rigid and the results do not need to be modified. When the above requirements could not be met, a simplified analysis method was proposed. The beam-column joint could be simplified as rigid connection first. Then the structural displacement, period, bearing capacity of component was simply modified. The proposed method provides the references for the design of this kind of structure.