Talk about the safety of steel structure engineering construction

Whether the steel structure material selection is appropriate is related to the construction and use safety of the steel structure project, so there are certain standards for material selection. Look at the introduction of the steel structure engineering construction team.

Step 1: Intensity

The editor of the steel structure manufacturer learned that the strength index of steel is the elastic limit, the yield limit and the tensile limit. The design is based on the yield strength of the steel. High yield strength can reduce the weight of the structure, save steel, and reduce costs. Tensile strength is the greater stress that steel can withstand before failure. At this time, due to large plastic deformation, the structure loses its performance, but the structure deformation is large and does not collapse, which meets the requirements of the structure to resist rare earthquakes. The size of the u/y value can be regarded as a parameter of the steel strength reserve.

Step 2: Plasticity

It is understood that the plasticity of steel generally means that after the stress exceeds the yield point, it has obvious plastic deformation and non-fracture performance. Steel structure engineering construction I manufacturers said that the main indicators of steel plastic deformation capacity are elongation and cross-section shrinkage.

Cold bending performance.

The cold bending property of steel is a measure of the resistance of steel to cracks when bending and deforming at normal temperature. The cold bending property of steel is tested by cold bending test.

Impact toughness.

The impact toughness of steel refers to the ability of steel structure construction under impact load to absorb mechanical kinetic energy during the fracture process, and is a measure of the mechanical properties of steel to resist impact load cutting, which may lead to brittle fracture due to low temperature and stress concentration. The impact toughness index of steel is generally obtained by impact test of standard specimens.

Weldability.

The weldability of steel refers to the welding joint with good performance obtained under certain welding process conditions. Welding performance can be divided into welding performance and service performance in the welding process. The welding performance in the welding process refers to the sensitivity that the weld and the metal near the weld do not produce hot cracks or cooling during the welding process, and do not produce cooling shrinkage cracks. Good welding performance means that the welding metal and the nearby base metal do not crack under certain welding process conditions.

Structural form and steel thickness.

Steel structure construction manufacturers use the structural form of lattice structure members, indicating that the material performance requirements are higher than that of solid belly members, because the connection between the decoration and the limbs may have stress concentration and need to be welded. For important tensile bending welded components, multidirectional tensile stress fields often occur due to residual tensile stress. When the thickness of the component is large, the rolling times are less, the steel holes and slag inclusion are more than the thin plate, and the defects are more. Tensile bending members with larger steel thickness have higher requirements for material properties.

Steel should also pay attention to durability. To do this, protective measures must be taken to prevent corrosion and rust of the steel. In the case of acid, alkali, salt and other strong corrosive media, steel should be regularly painted and maintained, and special protective measures should be taken.