Effective area in check of contact stress in concrete

Determination of the average stress over the effective area is required for the code-check of the contact stress in concrete block when the base plate is under compression. The contact stress is calculated as the design normal force N over the effective area A_eff.

The effective area A_eff is calculated as the overlap of the contact stress area A_eff,FEM, and the bearing offset of the anchored member A_eff,cm (its cross-section). These values are calculated automatically in the background based on the CBFEM analysis and the member cross-section offset given by the code.