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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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How many quality control points need to be implemented for the safety control of the space frame structure?

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space frame

1、The material must meet the design requirements.

2、The design of the spherical space frame must conform to the corresponding specification standards.

3、The quality control of assembling process.

4、The one-way axial tensile and compressive bearing capacity test of the ball node is as strong as the parent material requirements.

5、Bolt ball node for the thread of the largest bolt hole of the finished ball for tensile strength test.

6、The installation of the space frame should be the first control construction and installation program to have a practical grasp.

7、The reference axis and the elevation of the top of the column must conform to the design and standards.

8, focus on controlling the deflection value of the space frame under self-weight and load, the average deflection value of the measurement point shall not be greater than 1,15 times the design value.

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What is a coal bunker?

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Suspension structures

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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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