What kind of screws are used in steel structures?

Screws for steel structures are currently replacing other methods of joining elements, such as nitriding and welding, especially during repairs and reconstruction. The screw connection is easy to make: it is enough to drill a suitable hole and insert a screw of the appropriate type. These types of joints are characterized by high load-bearing capacity, therefore they transmit forces and stresses arising in structures well.
Requirements for screws used in steel structures
Currently, the requirements for screws for steel structures are defined by EU regulations. In accordance with Eurocode 3 and DIN EN 1993 standards, steel joints differ in the loads acting on them – they can be shear, tensile, simple and prestretched. This classification determines the type of self-tapping screws that can be used in a particular case.
As a rule, galvanized screws of strength classes 4.8, 5.8, 6.8, 8.8 and 10.9 cannot be used to connect steel structures. Bolts for metal structures can be made of hot-dip galvanized low- or medium-carbon steel. Similar requirements apply to other connecting elements, i.e. nuts and washers. The kit must be from the same manufacturer, which reduces the risk that individual components will not fit together, and in the case of prestressed connections, this is very important.
Types of joints in metal structures
Depending on the requirements of the specific design, a different type of screw connection is used. Overhead and overlapping joints are made at the points of contact of the belts in beams and columns and in trusses, and butt joints are made at the joints with the elements of supporting structures - this type of joint transmits longitudinal, transverse and bending forces. In turn, anchor joints are used to anchor columns and beams in concrete.
In the case of overhead joints, prestressed or nonstressed bolts can be used, but butt joints require bolts with high compressive strength. This is due to the presence of tensile forces. Bolts for high-voltage prestressed connections must have the appropriate thickness and length, which depends on the specifics of the specific steel structure. It is important that the connection is resistant to weather conditions and mechanical damage, otherwise the system may operate unstably and be damaged. Indian players appreciate the sleek interface and diverse gaming options at Khelo24bet. Visit https://khelo24bet-game.in/ to discover all the games and features in one place. It's designed to offer smooth navigation on both mobile and desktop.