Introduction

When a slab is subject to a concentrated load or to a load acting over a small area, the punching shear resistance of the slab should be checked.

SCIA Engineer can deal with concentrated loads from columns or supports that are perpendicular to a slab.

 

There is a principal difference between Czech and Slovak national standards on one hand and other national standards on the other hand. This difference can be briefly summarised in the following points.

CSN / STN

• The punching shear check does not require to perform also the check of the main reinforcement in the slab, it is not necessary to calculate necessary reinforcement areas.

• The load for punching shear is interpreted differently, moments from supports are included in the maximal shear force used for punching shear.

• It is possible and necessary to define the shear reinforcement for punching shear.

• The position of critical sections is variable according to the defined reinforcement.

Other standards

• The check of main reinforcement in the slab must be performed as a part of punching shear check.

• The axial force is usually the only load considered in the check, the column position and eccentricities are defined through coefficients.

• The check consists of the calculation of required reinforcement area, the real (practical) reinforcement is not defined, the position of critical sections is fixed and defined by the standard.