Punching through

The Punching category manages the parameters relevant for the punching shear designs.

Concrete Foundations | Punching Shear

The basic control perimeter is determined by an iterative calculation. If you select the 'Define iterative control perimeter for foundation' check box, you can define the distance to the load area l_w,it manually.

k_red is a factor for considering the favorable soil pressure within the punching cone. This factor determines what percentage of the soil pressure in the punching cone is considered as unloading in the calculation of the resulting shear force. The value of k_red = 1.00 means that the soil pressures within the punching cone are completely taken into account and thus have a maximum favorable effect. A value lower than 1.00 reduces the considered soil pressure accordingly, resulting in a higher resulting shear force.

The parameter β can be determined according to different options. There are three options in the list. The load increment factor can thus be determined under the assumption of a fully plastic shear stress distribution according to EN 1992-1-1 [1] 6.4.3(3), or from constant factors according to 6.4.3(6). It is also possible to enter a user-defined value.