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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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Causes and prevention of corrosion in space frame construction

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 Because most of the space frame engineering uses steel structure materials, due to the influence of paint and natural environment, rust corrosion is very likely. The following explains how to do anti-corrosion measures in the construction of large-scale space frame projects.

First, the causes of corrosion affecting large-scale space frame projects

The first is the coating aging problem of the space frame engineering, no matter what kind of material basically has the characteristics of aging, and this anti-corrosion coating is no exception, and the aging of this coating makes the failure of the anti-corrosion coating of the steel structure, and then makes the rust affect the life.

In addition, a natural environmental factor around the space frame project, if the air around the steel structure plant is relatively humid, then it will inevitably make the steel structure gradually rust under the erosion of water and air.

In addition, if the pollution in the surrounding environment is more severe, among which there are sulfide, nitride, carbide and other corrosive and harmful components in the polluted atmosphere, it will also affect the service life of the steel structure plant.



Therefore, for the maintenance of portal steel frame engineering, it is necessary to pay attention at all times, it is best to coat a layer of film, and at the same time, the anti-corrosion paint should be painted after a period of time, so that it can be used for a long time.

Second, anti-corrosion measures for large-scale space frame projects

1, surface treatment: the surface treatment of steel structure is very important, the same paint, the same corrosion environment, the use of different construction process life can be extended by three times to five times. The dirt and rust layer on the surface of the steel should be removed, especially the black oxide formed when rolling the steel, which is the cathode of electrochemical corrosion and the root cause of corrosion and must be removed. The surface treatment quality shall reach Sa2.5 level of the steel surface pretreatment specification before coating.

2, material selection: surface coating of special steel structure anti-corrosion paint, is still the main means of steel structure anti-corrosion and space frame anti-corrosion. Steel structure anti-corrosion coating according to the protection function can be divided into primer, middle paint and top paint, each layer of paint has its own characteristics, each responsibility, several layers combined to form a composite coating, improve anti-corrosion performance, extend the service life.

3, coating thickness: coating is an anti-corrosion intermediate material, must be coated to form a coating. If the coating thickness is uneven, burrs on the surface of the steel or the top of the anchor spinning will reveal the coating. If the coating construction passes are few, the coating has pinholes, and oxygen, chloride ions, and water molecules in the water pass through these weak places, making the steel rust and corrosion. The corrosion products expand in volume, forming rust packets, gradually expanding, and finally the coating bubbles off.

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