What are the connecting forms of steel structures? What are the characteristics of each?
Is the end of the rivet connection with prefabricated nail head rivet, screw holes are inserted in the connecting member, the rivet gun or pressure riveting machine, the other end is pressed into the closed nail head. So that the connecting piece is connected to form solid rivet clamping. Rivet connection is characterized by reliable power transmission, good plasticity and toughness, easy to check and ensure the quality of plate, can be used under dynamic structure of heavy load, but its structure is complicated, cost of steel work, poor working conditions, high cost, has been rarely used.
The bolt connection can be divided into two kinds: common bolt connection and high strength bolt connection. The advantages of the bolt connection are that the construction technology is simple and the installation is convenient, and the utility model is especially suitable for installation and connection on a construction site. The disadvantage is that due to open holes on the component section, there are some clear and weak connected panels need to overlap or separate pieces and connectors. Therefore, the welding material more than. In addition, the bolt connection is required in the plate making hole, etc., and the work place is increased.
Welding is the heat generated by the arc, the electrode and welding parts of local melting. After cooling into the welding seam, so that the welding piece is connected as a whole. The advantages are: the component in any form can generally direct orange even, does not weaken the component section. The economic materials, simple structure, convenient manufacture, connection stiffness, good sealing performance, can realize automatic operation, high production efficiency. The disadvantage is due to the formation of steel; weld heat affected zone of high temperature welding, resulting in local brittle material. In the process of welding material is not uniform with high temperature and cooling, the structure of the welding residual stress and deformation of the structure bearing capacity, stiffness and performance have certain effect. In addition, due to the rigidity of welded steel structure, local cracks can easily spread to the whole as soon as they occur, especially brittle at low temperatures. Moreover, the plasticity and toughness of the welding are poor, and the defects may be caused by blasting, and the fatigue strength is reduced.
