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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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Classification of steel structure nodes

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 It is widely used in modernist architecture. Steel structure installation is mainly carried out by electric welding welding and bolts. Because the steel frame structure is compact and practical, it brings great convenience to engineering construction. In order to promote the sustainable development concept of steel frame structure in the construction engineering industry, it is necessary to carry out an in-depth analysis of the construction stage of steel structure, especially the node design, to ensure reliability.

      Steel plate materials are widely used in modernist buildings because of their extreme seismic performance, plasticity and reliability. Jiangsu steel structure project construction is to be processed with bolts or steel to make the building structure. Accompanied by the improvement of living standards and the rapid development of the construction industry, the requirements for steel frame structure are rigorous. As a result, the design of steel frame structure nodes can effectively ensure that the steel frame structure meets the provisions of contemporary engineering construction and used, has a strong bearing capacity and ductility, and ensures the stability of the building structure!



      Node categorization:

      (1) Stiffness connection points. Stiffness connection point is to ensure that the steel frame structure in the whole process of pressure deformation light deformation of a connection point. In order to ensure the excellent characteristics of the steel structure, to ensure that the steel frame structure and beam-column structure nodes between the angle of intersection in the external force as far as possible does not produce changes, so that the main structure of the building for a long time to maintain. The interface strength of the rigid joint exceeds the tensile strength of the coupling. Thus, it is critical to manipulate the reliability and compressive strength of the joint. At the end of most rigid joints, the role of steel frame structural joints can be effective and fully realized

      (2) Hinge node efficacy. Articulated joints are generally not used to connect steel structural members, instead they are used to connect columns and legs. When the connection point and node beams and columns are connected, can only cause shear stress in the longitudinal direction, the steel frame structure will not produce the bending distance, while the solid joint construction can realize free rotation. The actual operation of hinge joint construction is relatively simple and convenient. Fixing the top of the steel frame structure in the building can improve its reliability, enhance the top load-bearing capacity, and ensure the safety of the building. Semi-rigid connection point is a kind of connection point between rigidity connection point and node. It has a certain bending distance and can produce a steel structure look. In addition, the semi-rigid construction can improve the level of seismic and flexural strength of the house building, which is a connection of strength rigidity flexibility. This type of interface is cost-effective in terms of flexural strength and can maintain the bearing capacity of Jiangsu steel structure. But the technical difficulty is also larger. Because the construction and design is unreasonable, the steel frame structure elasticity is too large, which will affect its smooth and safe degree, thus the application field is not wider.

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

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