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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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Research progress of cold-formed steel structure

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 Cold-formed steel members have the advantages of light weight, high strength, easy prefabrication and mass production, fast installation and recyclable. The cold-formed steel structure system is mainly composed of wall system, floor system and roof system. Through theoretical analysis and experimental research, the cold-formed steel structural system is studied in depth. 



The research direction covers the mechanical performance of cold-formed thin-wall steel basic members and composite members, the lateral resistance performance of composite walls, the bearing capacity, stiffness and comfort of composite floors, and the seismic performance of the whole building. The relevant research results are as follows: 1) The half-energy method is used to deeply study the related effects of plate group buckling, and the design method of effective width to thickness ratio of edge stiffened plates is established; The failure characteristics and mechanical properties of cold-formed thin-wall steel axial compression columns are revealed, and a unified analysis method for the buckling critical load of simply supported and steady-supported axial compression columns is established. 2) The failure characteristics and mechanical mechanism of double-limb split cold-formed thin-wall steel axial compression column and bending beam are revealed, and a simplified calculation method of ultimate bearing capacity of cold-formed thin-wall steel split section column and beam is proposed. 3) The mechanical mechanism, failure mode and mechanical properties of traditional cold-formed thin-wall steel composite wall and cold-formed thin-wall steel-plate shear wall under horizontal load are revealed, and the theoretical analysis method of cold-formed thin-wall steel composite wall is established. 4) The mechanical mechanism, failure mode and mechanical properties of cold-formed thin-wall steel composite floor under vertical load, horizontal load and vibration excitation are revealed, and the design calculation method of cold-formed thin-wall steel composite floor is proposed. 5) The failure characteristics, dynamic characteristics and seismic response of cold-formed thin-wall steel residential buildings under seismic loads are revealed, and the finite element analysis method of low and multi-layer cold-formed thin-wall steel structural system is established. 6) The mechanical mechanism, failure mode and mechanical properties of cold-formed thin-wall steel split section columns under fire were revealed, and theoretical analysis methods, simplified mechanical models and design calculation theories were established.

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What is a coal bunker?

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Suspension structures

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 A suspension structure is a structural form that carries roof loads through a series of high-strength steel cables. Its main load-bearing member is the cables, which are usually steel cables made of high-strength steel wires. The roof of the suspension structure is generally light and thin, and its shape can be very flexible, able to realize the large span across. For example, in the roofs of some large conference centers or exhibition halls, the suspension structure can create unique shapes such as double-curved paraboloid or single-curved paraboloid, which make the building have a strong artistic influence. Suspension structures require a stable support structure to anchor the steel cables, usually using reinforced concrete columns or steel columns as support. And in order to ensure the stability of the structure, it is also necessary to set a certain amount of prestressing, so that the steel cables are in a tensioned state before they are subjected to loads. Scope of applicatio...
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What is the difference between a single-layer reticulated shell and a double-layerreticulated shell?

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  The differences between single-layer reticulated shells and double-layer reticulated shells are as follows: Structural Configuration   Single-layer reticulated shell: Composed of a single layer of members, with the members directly connected to form a grid structure . The node configuration is relatively simple, typically employing rigid connections that allow the members to bear not only axial forces but also bending moments and shear forces.   Double-layer reticulated shell: Consists of upper and lower parallel layers of members connected by web members, forming a truss-like structural system. The nodes are generally hinged, and the members primarily bear axial forces. Its configuration is relatively complex, requiring more members and nodes to ensure structural stability and load-bearing capacity. Structure Single-layer mesh shell: composed of one layer of rods, the rods are directly connected to form a mesh structure, the node structure is relatively simple, usually...
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