steel grid structure is mainly composed of steel materials, which is one of the main types of building structures.The structure is mainly composed of steel beams, steel columns, steel trusses, etc.Joints, bolts or rivets are usually used between components or parts.Because of its light weight and simple structure, it is widely used in large factories, stadiums, super high-rise buildings and other fields.

What are the key points of steel structure design grid?

1。According to the force characteristics, it can be divided into friction type and pressure type.

Friction type high-strength bolt is the ultimate load of high-strength bolt connection based on the friction between connectors when the shear force is equal to the friction force.At this time, there will be no relative sliding between the connecting rods, the bolt rod will not be cut, and the bolt hole wall will not be pressurized.

Compression type high strength bolt is similar to ordinary bolt.The shear force can exceed the friction force.At this time, there will be relative slippage between the connecting parts, and the bolt rod will contact with the hole wall, while the joint depends on the friction of the bolt and the combined force of shear and pressure.

2。What is the difference between ordinary bolt and high strength bolt?

Ordinary bolts are usually made of ordinary carbon structural steel.Without heat treatment, high-strength bolts are usually made of high-quality carbon or alloy structural steel.In order to improve the mechanical properties of the composite, it is necessary to carry out quenching and tempering treatment.High strength is divided into 8.8, 10.9 and 12.9.

Strength grade: high strength bolt, 8.8s and 10.9s usually adopt two strength grades.General bolts are 4.4, 4.8, 5.6 and 8.8.

According to the mechanical characteristics, the pre tightening force of high-strength bolt is adopted, and the external force is transmitted by friction.The shear force of common bolt is transmitted by the shear force of bolt and the pressure of hole wall.

3。The types of steel are: thin plate thickness (thin plate thickness < 4mm), medium thick plate (medium thickness 4-20mm) and thick plate (thickness 20-60mm) with a wall thickness of more than 60.The steel strip is contained in the steel plate.

4。The steel structure grid system has the advantages of light weight, convenient installation, short construction period, good seismic performance, fast investment recovery and less environmental pollution.Plasticity and toughness have good impact resistance.

Deformation of high strength bolt is not suitable for direct connection under dynamic load