A spring washer is added between the connecting plate and the nut to prevent looseness. Refer to steel structure design code.

Second, the steel structure introduction:

Steel structure is a steel-based structure and one of the main types of building structures. The structure is mainly composed of steel beams, steel columns and steel trusses made of section steel and steel plates, and the components or parts are usually connected by welding, bolts or rivets. Because of its light weight and simple construction, it is widely used in large factories, stadiums, super high-rise buildings and other fields. Steel is characterized by high strength, light weight, good overall stiffness and strong deformability, so it is especially suitable for building long-span, ultra-high and overweight buildings. The material is an ideal elastomer with good uniformity and isotropy, which is most in line with the basic assumptions of general engineering mechanics. The material has good plasticity and toughness, can deform greatly and can bear dynamic load well; Short construction period; It has a high degree of industrialization and can be used for specialized production with a high degree of mechanization.

Third, the chart: