Steel structure torsional shear bolt

Product Details

high-strength bolt connection is through the bolt shank in a large tightening pre-tension to the connecting plate of the clamping, enough to produce a lot of friction, so as to improve the integrity and rigidity of the connection, when shear, according to the design and force requirements of the difference, can be divided into high-strength bolt friction type connection and high-strength bolt pressure-bearing type connection two, the essential difference between the two is the limit state is different, although it is the same bolt, but in the calculation method, requirements, applicable There are big differences in terms of scope, etc. In the shear design, the high-strength bolt friction type connection is the maximum state of the possible large friction provided by the bolt tightening force between the contact surfaces of the plate with the external shear force, that is, to ensure that the internal and external shear force of the connection does not exceed the large friction force during the entire use period. The plates do not undergo relative slip deformation (the original amount of void is always maintained between the screw and the hole wall), and the connected plates are subjected to the overall force according to elasticity. In the shear design, the external shear force is allowed to exceed the large friction force in the high-strength bolt pressure-bearing connection, and the relative slip deformation occurs between the connected plates until the bolt rod and the hole wall are in contact, and then the connection is transmitted by the bolt shaft shear and the pressure bearing of the hole wall and the friction between the contact surfaces of the plates, and then the rod body shear or the pressure failure of the hole wall is used as the limit state of the connection shear. In short, friction high-strength bolts and pressure-bearing high-strength bolts are actually the same bolt, but whether the design takes slip into account. Friction type high-strength bolt can not slide, bolt does not bear shear force, once slip, the design is considered to reach the state of failure, in the technology is relatively mature; Pressure-bearing high-strength bolts can slide, and the bolts also withstand shear forces, and the final failure is equivalent to ordinary bolt failure (bolt shear or steel plate crushing).

High-strength bolts are made of high-strength materials. The screws, nuts and washers of high-strength bolts are made of high-strength steel, commonly used 45 steel, 40 boron steel, 20 manganese titanium boron steel, 35CrMoA and so on. Ordinary bolts are commonly made of Q235 (equivalent to A3 in the past) steel.

Materials: Procurement of materials according to customer needs