1. The high-strength bolts of the same node are recommended to be in the same batch as the same manufacturer. This is to facilitate quality management, especially for large hexagon bolts. The torque method is used for the construction. The torque coefficient of the same batch of bolts is of significance for re-inspection. The torque coefficient and the designed axial force are calculated for the construction torque, not the same batch, the torque may not be the same, and the construction management is very troublesome.
2. Different manufacturer's high-strength bolts, nuts, and washers cannot be used as a set of bolts. This is clearly stated in the national standard. Otherwise, what is the significance of the torque factor?
3. There are currently two specifications, one is the “Design, Construction and Acceptance Regulations for High-Strength Bolt Connections of Steel Structures†of the Ministry of Housing and Construction, and the “Rules for Construction of High-Strength Bolt Connections for Railway Steel Bridges†of the Ministry of Railways. National standards include GB1228 "Big Hexagon Bolts for Steel Structures" and GB3663 "Twisted Shear Bolts for Steel Structures".
2. Different manufacturer's high-strength bolts, nuts, and washers cannot be used as a set of bolts. This is clearly stated in the national standard. Otherwise, what is the significance of the torque factor?
3. There are currently two specifications, one is the “Design, Construction and Acceptance Regulations for High-Strength Bolt Connections of Steel Structures†of the Ministry of Housing and Construction, and the “Rules for Construction of High-Strength Bolt Connections for Railway Steel Bridges†of the Ministry of Railways. National standards include GB1228 "Big Hexagon Bolts for Steel Structures" and GB3663 "Twisted Shear Bolts for Steel Structures".
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