装配式冷弯型钢结构楼盖承载性能的有限元分析

摘要

In order to study the bearing properties of the floor structure of precast cold-formed steel building which adopted a new type beam-column joint,that is pin-connected flange joint,this paper has analyzed the bearing properties and natural frequency of the floor structure of precast cold-formed steel building, and the influence of the pin-connected flange joint and the beam-slab connection on the bearing properties of the floor structure has also been analyzed by the software ANSYS,taking a demonstration building in southern China for example,so as to provide technical support for the drawing of the related specifications. The finite element analysis results show that the flange joint with column pin-connected adopted in this paper has high stiffness,the floor structure which adopts this joint has adequate loading capacity,and the connection of column-beam and beam-slab has large effect on the bearing properties of the floor structure, which should be paid much attention to and guarantee its reliability in engineering.%目的 研究销轴法兰节点及应用此种特殊形式节点的装配式冷弯型钢结构楼盖的承载性能,为其推广应用及有关规范标准的编制提供技术支持.方法 以我国南方某工程示范楼的楼盖为算例,利用有限元软件ANSYS对装配式斜支撑冷弯型钢结构楼盖在竖向荷载作用下的承载性能及自振频率进行分析,并对结构中销轴法兰节点、组合楼板与钢梁连接方式对楼盖承载性能的影响进行研究.结果 算例中销轴法兰节点刚度较大,应用此种节点的楼盖承载力及变形性能在楼面荷载小于10 kN/m2时接近于节点刚接模型；梁柱节点刚度对楼盖整体结构承载性能的影响明显；楼板与梁铰接模型的整体承载力及竖向刚度均低于楼板与梁刚接模型.结论 算例中应用销轴法兰节点的装配式冷弯型钢结构楼盖具有足够的承载力并能满足正常使用的要求；在装配式冷弯型钢结构的设计中,应对梁柱节点刚度及组合楼板与钢梁的连接方式予以重视,保证连接可靠.