What are the node classification of steel structure?

Steel structure engineering is a common building structure in the construction industry, which is widely used in modern buildings. The construction of steel structure is mainly completed by welding and riveting. Because the steel structure is simple in structure and strong in operability, it brings great convenience to the construction. In order to promote the sustainable development of the steel structure in the construction industry, it is necessary to conduct in-depth research on the construction process of the steel structure, especially the node design, to ensure the stability of the steel structure.

Steel has strong shock resistance, ductility and stability, and has been widely used in modern buildings. Steel structure engineering is a kind of building structure welded with rivets or steel. With the improvement of people's living standards and the development of the construction industry, the demand for steel structure is also increasing. Therefore, the steel structure node design can effectively ensure that the steel structure meets the requirements of modern construction and use, ensure that the steel structure has good bearing capacity and ductility, and ensure the stability of the building structure

What are the node classification of steel structure?

First, steel structure node classification

(1) Rigid nodes. A rigid node is a node to ensure that the steel structure does not deform or slightly deform during the stress process. In order to ensure the good performance of the steel structure, it is necessary to ensure that the Angle between the steel structure and the joint of the beam and column structure may change under the action of stress to maintain the stability of the building structure. The joint strength of a rigid joint is greater than the yield strength of the connector. Therefore, the stability and strength of the control joint are very important. After all the rigid joints are completed, the joint function of the steel structure can be effectively played

(2) The function of articulated nodes. Hinged joints are usually used to secure columns and legs rather than joining steel members. When the joint is connected with the joint beam and column, there is only vertical shear force, the steel structure does not produce bending moments, and the articulated structure can rotate freely. The construction operation of articulated joint is relatively simple and practical. Fixing the end of the steel structure in the building can improve its stability, improve the bearing capacity of the end, and ensure the safety of the building. A semi-rigid node is a node between a rigid node and a node. It has a certain bending moment and can form the shape of a steel structure. In addition, semi-rigid structures can improve the seismic and bending capacity of the building, that is, the connection between stiffness and flexibility. This connection method has good bending resistance and can maintain the bearing capacity of the steel structure. However, construction was relatively difficult. Due to improper structure and design, excessive elasticity of steel structure will affect the stability and safety of steel structure, so the application range is not very wide.

Second, the basic design points of steel structure nodes

1. Design rigid nodes and semi-rigid nodes

(1) Splicing of beams. Horizontal splices are usually divided into welded and bolted connections. High welding stiffness, usually used for factory splicing; Although the anchorage stiffness is small, the construction is convenient and fast, and can be carried out on site to ensure the construction quality of the steel structure. It is usually used in field construction and has a good effect on the bearing capacity and stability of the beam.

(2) The connecting beam between the transverse column and the transverse column. The connection between the transverse column and the transverse column beam is also rigid. It is mainly connected by the end plate and connected by the component welding plate. Can be designed according to the position of the end plate, can be vertical, inclined or flat.

2. Connect the center column to the crucible

(1) I steel column or welded composite column. The connections of the column joints are also rigid. In the design, the column ends and beams, as well as the column flanges and beams, are joined by welding. The column and web are fixed with bolts, and the end of the column and beam are fixed with T bolts. The welded joint has the advantages of high strength, good stability and high stiffness of steel structure joint. However, due to the high welding precision and large workload, the welding process can not be fully guaranteed. Therefore, this connection method has certain limitations. If the integral welding method is used, the welding work can be completed in the factory to ensure the welding quality; The anchoring method is convenient in construction and requires low construction accuracy and stiffness. Therefore, two types of connection can be used: when using a T-bolt, it is welded to the flange of the beam. This requires the retention of T-casting holes during the pouring process to facilitate the installation of nodes and reduce workload. The connections between the column tops are divided into positive connections and inclined connections. I steel column orthogonal connection can be fully welded.

(2) Box-type welded composite column. Joint between box welded composite column and beam. When selecting the joint connection method, the connection between the beam and the column is generally welded between the beam and the column, and the steel plate is also welded, and the steel plate and the web plate are welded with high-strength friction bolts.