大跨度钢结构雨棚关键节点研究

Research on Key Joints of Long-span Steel Canopy

研究目的:大跨度钢结构雨棚关键节点受力复杂、杆件较多,采用常规节点形式往往需要增设插板、外加劲肋等,影响建筑美观;且现行规范对相贯节点设计存在空白之处。本文拟采用铸钢节点形式,并运用有限元分析方法对铸钢节点进行计算分析。研究结论:(1)大跨度钢结构雨棚关键节点采用铸钢节点,可避免多杆焊接时的残余应力、节点设计自由度大、外形设计容易满足建筑造型要求;(2)采用有限元方法可以计算得出铸钢节点的强度破坏、局部稳定破坏和节点的变形,并与设计规范进行校核;(3)通过合理设置节点壁厚、内加劲肋等,可有效降低应力、增强节点刚度、避免局部变形,满足设计要求;(4)本文结论适用于网架、桁架等大跨度钢结构节点设计。

Research purposes： The long - span steel canopy has key joints and many bars with complex load bearing. If the conventional joint style is adopted, it needs more insertion plates and outer reinforced rib to influence the architectural beauty. In addition, there is gap in the joint design in the current codes. The cast - steel joint is presented and the finite element method is used for the analysis of the cast - steel joint in this paper. Research conclusions： （ 1 ） If the cast - steel joint is used for the long - span steel canopy, it can avoid the residual stress when welding multiple bars and its shape can meet the requirements of architectural modeling because of the big freedom. （2）The failures in strength and stability and deformation of joints can be known and compared with the design code by using finite element method. （3）The stress can be cut, the joint stiffness can be enhanced and the partly deformation of the joint can be avoided by reasonably setting the wall thickness of the joint and the internal reinforced rib to meet the the design requirements. （4） 4. The conclusions can be used in joint design of long- span steel structures, such as grid, truss and so on.