Punching Shear Reinforcement

ANTI-PUNCHING ARMOR REINFORCEMENTS

The weight of a plate supported on a column induces shear stresses on the slab. These stresses, if sufficient and where no additional reinforcement is provided, would result in the ‘drilling’ column through the slab. This perforation cut is similarly induced at the base on which the column rests. Although the drilling cut can be alleviated by the localized thickening of the cement with the supporting beams and extended column heads, the construction of flat plates offers many advantages. A consistent main space can reduce the total height of a building to 3 and can provide significant time and material savings.

Typical arrangements

Our Shearfix system is suitable for all speaker shapes and locations. The layout of the Shearfix rails is determined by the design calculation or design program. Some of the typical arrangements are shown here.

The weight of a support slab on a column induces shear stresses in the slab. These stresses are sufficient, when additional reinforcement is not foreseen, result in “perforation” by the column through the slab. This perforation effect is also induced at the base of the column. Although the punching can be alleviated by localized thickening of the cement with hanging beams and attenuated by capitals protruding from the pillars, the construction of flat slabs offers many advantages. Cortartec Shearfix is ​​the ideal solution for the design and construction of problems associated with punching. The system consists of connectors with two heads welded to flat bars and are positioned around the top of the column or at the base. The cutting force of the slab is transferred through the connectors into the column. The connectors are welded to the rail at specific centers or when calculating the design. Cortartec Shearfix is ​​suitable for all forms of columns and it is very easy to install the ‘top down’ or ‘bottom up’, depending on the preference on site.