What are shear keys used for?
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What are shear keys used for?
Shear key is a structural element which is sometimes used in the footing of retaining walls to reduce wall’s sliding.
What is shear key in steel column?
When structure is failing in Sliding criteria during the stability check due to large horizontal forces on the column , Shear key is provided during construction joint of column to stop the sliding of column from joint there by increasing factor of safety for sliding.
What is shear key in dam?
Abstract. Contraction joint shear keys are resilient features of gravity dams that can be considered to increase the sliding safety factors or minimise seismic residual sliding displacements, allowing costly remedial actions to be avoided.
What is shear key in bridge?
Shear keys are used in bridge abutments to provide lateral restraints to bridge superstructures under normal service loads and moderate earthquake forces. In the event of a severe earthquake, shear keys should function as structural fuses to prevent the transmission of large seismic forces to the abutment piles.
How do I keep my retaining wall from sliding?
Measures to Prevent Retaining Wall Distress and Failures
- Redeem surface drainage problems.
- Reduce retaining wall height.
- Use tie backs.
- Extend the footing.
- Remove and replace backfill materials.
- Reinforce the front of the wall.
- Add a key.
- Use cantilevered soldier beams.
What are cantilever retaining wall shear keys used for?
Reinforced concrete cantilever retaining walls bearing on soil usually have a shear key incorporated into their footing base. The intended function of the key is to increase the sliding resistance of the wall. A study of the efficiency of shear keys and their location on the footing (toe, stem, or heel) was performed.
What is a key in construction?
The shear key is a part of the structural element mostly used to make the structure stable against the lateral loads. Depending on the type of construction and nature of the loading, the application of shear is different. Mostly the shear keys are constructed between two structural elements.
What is a key in concrete footing?
Engineers and architects frequently show a shear key at the joint between a footing and a basement wall. Shear keys are used to resist lateral forces such as earth and water pressures, earthquakes, and wind.
Why are keys provided in dams?
Shear keys in the contraction joints are an important component intended to maintain the arch shape of the dam by resisting upstream/downstream relative displacements between adjacent monoliths through the transfer of shear forces.
What is a cantilever retaining wall?
Cantilever retaining walls are constructed of reinforced concrete. They consist of a relatively thin stem and a base slab. The base is also divided into two parts, the heel and toe. Use much less concrete than monolithic gravity walls, but require more design and careful construction.
How do you strengthen a retaining wall?
The wall can be strengthened by transferring some of the shear force to the base where the wall meets the ground. This can be done by either extending the footing of the base or placing concrete to thicken the base. Installing anchors or tiebacks is another option for extra strength.
What is a key in concrete?
A key joint is a pre-manufactured device used to create control joints in concrete structures. As freshly-poured concrete begins to dry, it tends to shrink or contract. Concrete is poured into the forms, and the key joint automatically creates a control joint in the structure.