Requirements and precautions for material selection of steel structures

【1】 Requirements for material selection of steel structures

Due to differences in the parts and functions used, the material of the steel used may also vary. If machine parts require steel with moderate toughness; The materials used in the lathe machining workshop; Materials selected for petrochemical industry; There are many types of steel, but few can meet the requirements for structural steel. Choosing steel for building structures should meet the following points:

The chosen steel is steel with high tensile strength and yield point. By increasing the yield strength of steel, one can choose profiles with smaller cross-sections. Reducing the weight of the steel structure itself, achieving a decrease in the amount of steel used, and reducing the investment cost of steel structures in Beijing. Increasing the tensile strength of steel can improve the lateral thrust resistance of the structure.

Sufficient deformability. Good plasticity and toughness performance. Steel has good plasticity, and when it is damaged by external loads, it is easy to identify the point of failure. Reduced the risk of sudden collapse of steel structure buildings. Steel with good plasticity has the ability to reduce the internal stress values caused by sudden loads. And generate local deformation, digest stress. When subjected to vibration loads, most of the vibration force can be consumed, significantly reducing the risk of sudden structural failure. When plastic design is involved in steel structure buildings in earthquake prone areas, the deformation of steel is crucial and affects the entire building.

Good processing performance. Steel can be processed by cold forging, hot rolling, and has weldability.

When processing, try to maintain the inherent characteristics of the steel and not reduce its own performance due to the use of processing technology.

Otherwise, the structure of the entire building will pose significant risks.

The steel used in the load-bearing structure of steel structures should have certificates of yield strength, elongation at break, and tensile strength.

【2】 Precautions for steel structure installation

Steel structure manufacturers not only undertake the design and production of various spare parts for steel frame structures, but also undertake the overall installation of steel frame structures. Generally, steel structure engineering conducts various convenient measurements and pre installation tests before construction, and there are no problems throughout the entire construction process. The key points of steel frame structure installation include the following aspects:

1. The prefabrication of steel prefabricated components shall be carried out on a steel platform in accordance with the installation sequence and processing technology regulations, and the welding and manufacturing quality shall be ensured.

2. The spacing between the joint of the flange plate of the channel steel and the joint of the beam end should exceed 200mm. The length of the flange plate splicing should not be less than twice the width of the plate; The total width of beam end splicing should not be less than 300mm, and the length should not be less than 600mm.

3. In order to facilitate welding and ensure welding quality, the reinforcing plates, connecting plates, cushion blocks, and cantilever beams on the vertical poles and load-bearing beams should be checked and welded on the road steel platform according to the construction drawing specifications as much as possible.

4. Prefabricated steel components on steel platforms should not only be manufactured and assembled according to construction drawings and standards, but also take into account the on-site installation process performance and changes in installation specifications.

5. After installation, carry out measurements and inspections at all levels.