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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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Steel structure design of high-speed railway station

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 The high speed railway station has a novel shape, and the structure above the ground adopts steel structure and the overall scheme of steel structure + space frame is adopted. In order to realize the design concept of "displaying the natural beauty of the structure", the structural main station adopts the construction and bridge integration structure system according to the requirements of the building facade and the interior decoration effect. The structural system of "A column +Y column + straight column supported catenary steel truss roof "is designed. The tilt Angle of the west leg of pillar A is consistent with the elevation Angle of the building, which cleverly integrates the structural members into the building facade and provides effective lateral force and vertical support for the structural system. Y-pillar provides a more spacious and comfortable space for the waiting hall, enriches the interior visual effect, and reduces the structural span of the two-span main truss of the roof, providing vertical support for the roof structure. The vertical columns achieve the effect of the eastern facade of the building, while providing vertical support for the roof structure system; Catenary main truss beam avoids the increase of cost and construction difficulty caused by secondary structure finding.



This structure system combines construction and bridge, and the system is unique. The concrete structure is below the rail layer, and the steel structure is above the rail layer. The damping ratio of the two structural materials is different, and the lateral stiffness of the upper and lower parts is sudden change. There is a large empty area over the entrance hall of the main station, and the waiting floor is discontinuous. The commercial interlayer is a transfer structure with discontinuous vertical components. The maximum span of the steel structure roof is 84 m, the maximum roof overhang is 18 m, and the maximum height of the building is 43 m. This project is A complex combined structure, so three structural systems are compared (scheme 1: A column at both ends + space frame; Scheme 2: A column at both ends + two columns in the middle + space frame; Scheme 3: A column at both ends + Y column at the east side + truss), after adopting the seismic performance design, the dynamic elastic-plastic analysis of the structure is carried out by using ABAQUS model, the comfort level of vehicle-induced vibration is analyzed by using ANSYS model, and the key nodes are analyzed by finite element method to provide reliable theoretical support for the safety and economy of the structure.

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What is a coal bunker?

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Coal bunker , is a structure used for storing coal. Coal bunkers play an important role in thermal power plants, coal mines and coal marshalling stations. Depending on the specific application scenario and design, there are various types of coal bunkers, such as circular coal bunkers, square coal bunkers and open coal yards. Safety Management of coal bunkers Preventing spontaneous combustion of coal: Since coal itself contains certain moisture and volatile substances, long-term exposure to the air may lead to spontaneous combustion, so the safe management of coal bunkers is of great significance in preventing spontaneous combustion of coal. Ensure the quality of coal: coal in the coal bunker usually needs to be stored for a long time, if not managed properly, it may lead to the decline in the quality of coal, such as sulphurisation, weathering and other phenomena, so it is necessary to ensure the quality of coal by strengthening the safety management of the coal bunker. Improve the eco...
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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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