According to the chapter 5.2 of the Dutch national application document NEN-EN 1995-1-1:2005/NB:2011 it is possible to take into account the spreading of the concentrated load. The spreading reduction factor can be estimated by the following expression:

The reduction factor limit values are 0 and 1.

If the wainscoting thickness is very big (the second moment of area I is also big) or/and the distance between the support a is very small, the expression will return the limit value to 0 – so the full spreading will appear and a very small spreading reduction factor (0.001) will be used in the software calculations.

If the wainscoting is very thin (so the second moment of area I is small) or/and the distance between the support a is very large, the expression will return the limit to the value 1 and the spreading procedure doesn't need to be applied.

The information about limit situations can be found in the tooltip in the last column of the Result tab grid.

Book traversal links for Concentrated load spreading factor