The principles of steel structure design are safety first, followed by the economy, and should be consistent with the construction installation level. The most important steel structure in the plant is the connection between the frame and the column. The rigid connection, the flexible connection and the semi-rigid connection are divided according to the relationship between the rotational stiffness of the connection and the connection structure. Most of the currently used nodes are rigid connections and flexible connections, and semi-rigid connections are used less.


For the safety of steel structures. Usually contains both strength and ductility. Ductility of the node under the action of the earthquake deformation ability, does not occur brittle damage, is an ideal form of the node. Semi-rigid connection nodes, there is no suitable calculation model application has been limited. The flexible connection can transmit axial force, shear force and very small moment, which can be seen as a hinge. Rigid connection Steel structure nodes are generally of three types: all welded connections, plug welding connections and full bolt connections. All welded joints, the edges of the beam and the web are all welded to the pillars.