Punching Shear Reinforcement
Slab loads induce shear stresses into the slab section around columns. If these stresses exceed the concrete shear capacity, and where additional reinforcement is not provided, the column would ‘punch’ through the slab. This punching shear is similarly induced in the footing on which the column bears.
Although punching shear can be relieved by localised thickening of the concrete with downstand beams and enlarged column heads, the construction of flat slabs offers many advantages. A consistent head space can reduce the overall height of a building and provide significant time and material savings.
Ancon Shearfix Punching Shear Reinforcement is used within a slab to provide additional reinforcement around the columns. It is an ideal solution to the design and construction problems associated with punching shear.
The system consists of double-headed studs welded to flat rails, positioned around the column head or base. The studs are welded to the rail at centres determined by our software or by a design calculation.
Shearfix is suitable for all column shapes and is easy to install either ‘top down’ or ‘bottom up’, depending on user preference.
Building Information Modelling
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Leviat has released an enhanced version of its popular Ancon Shearfix design software that enables engineers to maintain a flat concrete slab at column heads by reinforcing the area against punching shear with a prefabricated, stud-rail system.