Design and construction of steel structure shed joints
Steel pipe roof trusses are just one of a wide variety of steel pipe structures. Most of the steel tube roof trusses in the single-storey steel structure shed are plane trusses, while the steel tube roof trusses in civil buildings are more common with space trusses. Steel tube roof trusses and section steel roof trusses have brought many changes in the design due to the different cross-sectional forms. The most obvious one is that most of the member nodes of the steel tube roof truss are connected by the non-gusset plate which is widely used in the steel tube structure. This connection method makes the joint design and structure of the steel pipe roof truss completely different from the traditional connecting plate joints.
1. Design regulations and structural requirements for the direct intersecting joints of steel pipe roof trusses, the applicable range of geometric parameters of various steel structure workshop joints, and the calculation methods of bearing capacity and welds.
2. For the steel pipe roof truss connected directly by the nodes, the yield ratio of the pipes should not be greater than 0.8. The thickness of the steel pipe welded to the tension member should not be greater than 25mm, otherwise measures should be taken to prevent laminar tearing caused by large tensile stress along the thickness direction.
3. In the design of steel structure shed trusses, the node structural should be simplified and unified as much as possible, and the number of nodes should be reduced.
4. The intersecting connection without the gusset plate can save the consumables of the gusset plate and appropriately simplify the node structure, but the curved surface intersecting construction of the pipe fittings is more complicated, and the production technical requirements are higher, in contrast, the plane intersecting is relatively simple. In addition, the welding of the direct intersecting connection is more difficult, and the requirements for welding technology are also higher.
In addition, although the steel pipe roof truss has some advantages of saving steel compared with the section steel roof truss, the unit price of the pipe is generally slightly higher than that of the ordinary section, and the complexity of processing and manufacturing will weaken or offset this advantage. In the design, the influence of various factors should be comprehensively balanced, and the construction cost of the steel structure shed should be controlled within a reasonable range.
