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What is a shear key in steel structures?

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 In steel structure engineering , the column base connection serves as the pivotal interface linking the superstructure to the concrete foundation below. It must safely and reliably transmit various loads from the upper structure: vertical pressure , uplift forces , bending moments , and horizontal shear forces . When horizontal shear forces become substantial, the friction alone between the column base plate and the concrete foundation surface proves insufficient to resist them. At this juncture, a critical small component becomes indispensable—the shear key . Shear keys, as the name suggests, are structural steel connection components specifically designed to resist and transmit horizontal shear forces. Essentially, they are short steel members. Installation location: Typically welded or anchored to the base plate of a steel column (or other load-bearing components such as equipment supports ), with its lower end embedded in the concrete foundation or concrete structure cast ...
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Construction and installation technical frame of light steel structure in building

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 1 Specific advantages of light steel structure

Light steel structure has the following advantages: First, shock resistance. At present, the triangular frame system made of cold-formed steel is the product used by most building materials in China, the principle of which is to use the stability characteristics of the triangular. Then, in order to make the gypsum board of the house and the building structure of the house itself more stable, the construction personnel can make the house form a strong structural system by using steel building materials. Compared with the traditional building structure, it has a more powerful seismic function and load resistance, and is mostly suitable for disaster-prone areas, fully reflecting the universality of light steel structure. Second, corrosion resistance. The construction of light steel structure is all made of cold-formed steel, which is made of galvanized sheet material with strong corrosion resistance, which can avoid the corrosion of steel in the specific construction and use to a certain extent, effectively increase the use time of light steel, and fully reflect the practicality of light steel; Third, cold resistance. Light steel doors and Windows are made of insulating glass, which can not only play a good role in insulation, but also fully reflect good sound insulation in use; Fourth, comfort. The process of light steel in the specific construction is relatively simple, and it is also more convenient in transportation, in addition, the steel bone of light steel has full recyclability, so it is also highly recommended in the use of building materials. The application of light steel structure in the building, if the roof design can be used in the house, the air in the house can be circulated freely, so that the residents in the house can enjoy fresh air and bring comfort at any time; Fifth, it has certain wind resistance. The material used in the light steel structure is lighter, the overall performance is better and has a certain hardness, which can bring effective protection to the personal safety of residents when different disasters come.



2 The specific installation of light steel structure

Light steel structure has many advantages and has developed rapidly in a modern society, and today, light steel structure has been involved in all aspects of residents' lives. In order to successfully and efficiently complete the building construction project, the following light steel structure installation, specific operation and maintenance issues are discussed in detail.

The light steel structure needs to be prepared in the early stage of installation: construction technicians choose qualified building materials, welding equipment and testing equipment at the time of completion, construction personnel need to have the qualification certificate issued by the state, and in the construction process in accordance with the relevant national standards for construction.

(A) column foot installation

First, when the steel frame of the light steel structure is carried out in the house ceiling, there will be some artificial unavoidable lateral pressure, and it will cause damage to the column top. When the column foot is embedded, the outer bolt should not be too close to the column foot, and a certain distance should be left with the column foot. At the same time, it is necessary to ensure that it can reach a certain strength before the steel frame can be suspended.

Second, the gap between the column feet is too small, resulting in the grouting work is difficult to complete, generally the gap of grouting again is 50 mm.

Third, the position of the column feet of some construction projects is not accurate, but in order to ensure that the steel frame can be accurately in place, the construction site is twice punched, and it is arbitrarily cut, the opening hole of the column bottom plate is too large, making the stability of the column feet is not strong, and can not meet the construction standards.

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What is the difference between a single-layer reticulated shell and a double-layerreticulated shell?

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