Brief overview of shear wall and shear wall reinforcement
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Shear walls refer to vertical components which carry vertical loads as well as restrict the horizontal deformations of the structural frame.
The term “shear wall” The length to thickness ratio of these vertical components remain 4 or more.
If it becomes necessary for a shear wall to operate in the required way, there should be two columns implanted inside its ends (boundary components).
If at any time the shear wall does not eliminate properly defined, normal columns at its ends, two hidden columns are developed with proper reinforcement at the edges of the wall’s mass. Their width is identical to the shear wall’s thickness and their length should be equivalent to one and a half times the wall’s thickness (≥ 1.5b).
Shear wall’s behavior: The cracks that open because of the enforced seismic forces in one direction, will close while the direction is modified. It will be continual for the complete duration of the earthquake.
Shear wall reinforcement: The boundary components, either normal or hidden, are reinforced based on the rules which are applicable to columns.
The wall body is reinforced with two equivalent grates one at each face that are detained together with ‘S’-shaped transverse bars.
The vertical grate rebars should contain a minimum diameter identical to Ø10, whereas the horizontal rebars should be minimum Ø8 .The ‘S’ shaped reinforcement should be larger or identical to 4Φ8/m2.
The ‘S’- shaped reinforcement: ‘S’-shaped bars offer anti-buckling self-control to the longitudinal reinforcement.
Besides, it makes sure that the vertical and the horizontal rebars will function side although there is possibility for occurrence of concrete spalling due to an strong earthquake event.
The ‘S’-shaped link is built up with one closed corner at an angle equivalent to 180°, or 135° and the other corner bent at an angle equal to 90°. It is essential for its trouble-free placement. However, after its positioning the second corner must be also bent at a minimum angle equivalent to 135°.
Shear wall reinforcement: Shear wall reinforcement will be same as ‘S’ shaped reinforcement.
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