Approach to determine ultimate stress mobilization in the Interface of rigid inclusion head and load transfer platform. One field of application for rigid inclusions is the soil improvement for large-area structures such as (fibre-) reinforced slabs of logistics centers and other complexes. To optimise the slab (thickness and reinforcement), a load transfer platform (LTP) is usually installed above the columns. The aim of the LTP is to decouple the rigid inclusions from the structure and to enable a shallow foundation design of the slab. The interaction between columns, LTP and slab must be taken into account, which can cause additional stresses in the LTP and in the slab. In this paper, the approach proposed by french ASIRI recommendation for a granular LTP over rigid inclusions is presented, considering the conventional failure mechanism according to German standard DIN 4017. In a parameter study, influencing variables on the limit state of the LTP be evaluated. In addition, the results of FE calculations on an axisymmetric unit cell with a stiffness reduction of the surrounding soil are used. The FE calculations show that the allowable limit stress increase with a reduction of the LTP thickness, but up to the critical height additional bending moments in the slab must be taken into account. The bending moment increases with a reduction of the LTP thickness.
