Connection method of steel structure engineering

Connection methods of steel structure engineering

The connection methods of steel structure engineering include welding seam connection, bolt connection and rivet connection.

Weld connection in steel structure engineering

Weld connection is the local melting of welding rod and weldment by the heat generated by the arc , which is cooled and condensed into a weld, thereby connecting the weldments into one.

Advantages: It does not weaken the section of the component, saves steel, has a simple structure, is easy to manufacture, has high connection rigidity, good sealing performance, is easy to use automated operations under certain conditions, and has high production efficiency .

Disadvantages: The heat-affected zone of the steel near the weld due to the high temperature of welding may be brittle in some parts; the steel is subjected to unevenly distributed high temperature and cooling during the welding process. , the structure produces welding residual stress and residual deformation, which has a certain impact on the bearing capacity, stiffness and service performance of the structure; due to the high stiffness of the welded structure, the local crack is easy to expand to the whole once it occurs, especially at low temperatures. ; The plasticity and toughness of the weld connection are poor, and defects may occur during welding, which reduces the fatigue strength.

Riveting is a rivet with a semi-circular prefabricated head at one end, and the nail rod is quickly inserted into the nail hole of the connector after being red-hot, and then the rivet gun is used to attach it. The other end is also riveted into a nail head to make the connection tight.

Advantages: riveting has reliable force transmission, good plasticity and toughness, and easy quality inspection and assurance. It can be used for heavy-duty and structures that directly bear dynamic loads.

Disadvantages: The riveting process is complicated, the manufacturing cost is labor and material, and the labor intensity is high, so it has been basically replaced by welding and high-strength bolt connections.

Steel structure engineering bolted connection

The bolted connection is to connect the connecting parts through bolts. connected as one. There are two types of bolted connections: ordinary bolted connections and high-strength bolted connections.

Advantages: simple construction process and convenient installation, especially suitable for site installation and connection, and easy to disassemble, suitable for structures that require assembly and disassembly and temporary connections.

Disadvantages: It is necessary to drill holes on the plate and align the holes during assembly, which increases the manufacturing workload, and requires higher manufacturing accuracy; the bolt holes also weaken the cross-section of the components , and the connected parts often need to overlap each other or add auxiliary connecting plates (or angle steel), so the structure is complicated and the steel is expensive.

Steel structure should study high-strength steel in the future to greatly improve its yield point strength; in addition, new types of steel, such as H steel (also known as wide flange steel), should be rolled. ) and T-shaped steel and profiled steel plates to meet the needs of large-span structures and super high-rise buildings.