Steel structure bolt friction type and pressure type

       The steel structure bolt connection also consists of bolt rod, nut and washer. It is made of high strength steel (such as 20 MN Ti B, 40 b, 45 steel) after heat treatment. Special spanner shall be used for steel structure bolt connection to tighten steel structure bolt and apply specified pretension

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       Steel structure bolt shear connection can be divided into friction type and shear compression type (or pressure bearing type) according to its force transmission mode. Steel structure bolts are divided into two types: large hexagon head type and torsional shear type. During the installation, special spanner is used to tighten the nut with a large torque, so that the screw has a large pre tension.

       The pretension of the steel structure bolt clamps the connected parts, which causes great friction on the contact surface of the parts. The external force is transmitted by friction. This kind of connection becomes steel structure bolt friction type connection.

       It has the advantages of convenient construction, less weakening of components, detachable and replaceable, able to bear dynamic load, fatigue resistance, good toughness and plasticity, including the respective advantages of ordinary bolt and rivet connection, and has become an excellent connection form instead of riveting at present.

       In addition, the steel structure screw can also be the same as the ordinary bolt, allowing the contact surface to slide, relying on the pressure between the bolt rod and the bolt hole to transmit force. This kind of connection is called steel structure bolt bearing type connection.

       Friction steel structure bolt shear connection depends on the friction force of the contact surface of the clamped plate bundle. Once the friction force is overcome, the connected members will slide relatively, which is considered to be in a failure state.

       For shear compression steel structure bolt shear connection, it is assumed that after the friction of the contact surface of the plate bundle is overcome, the bolt rod contacts the hole wall (the hole diameter is 1.0-1.5mm larger than the rod), and the force is transmitted by the bolt shear resistance and the hole wall pressure.

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