High strength bolt connection has the advantages of simple construction, good mechanical performance, replaceable, fatigue resistance, and no loosening under dynamic load. It is a promising connection method
High strength bolts are tightened with special spanners
It makes the bolt produce huge and controlled pretension
Through the nut and base plate, the same amount of pre pressure is produced on the connected parts
There will be greater friction along the surface of the connected part. Obviously, as long as the axial force is less than this friction, the component will not slide and the connection will not be damaged. This is the principle of high-strength bolt connection
High strength bolt connection depends on the friction between the contact surfaces of the connector to prevent them from sliding. In order to make the contact surface have enough friction
It is necessary to increase the clamping force and the friction coefficient of the contact surface of the components. The clamping force between the components depends on the pretension applied to the bolts
Therefore, the bolt must be made of high strength steel, which is also called high strength bolt connection
In high strength bolt connection, the friction coefficient has a great influence on the bearing capacity. The test shows that the friction coefficient is mainly affected by the form of the contact surface and the material of the component
In construction, sand blasting and wire brush cleaning are often used to treat the contact surface of components within the connection range. In fact, there are two types of friction type and pressure type for high-strength bolts. The shear force bearing criterion of friction type high-strength bolts is that the shear force caused by design load does not exceed the friction force
The design criterion of pressure bearing high strength bolt is that the rod body is not sheared or the plate is not crushed, and the hardness is good
