Calculation of round foundation slabs subjected to non-uniform base deformation under complex loads

Abstract New patterns of determining internal forces for possible conditions of elements of the first and second categories of reinforced concrete slabs subjected to complex loads are established. The introduction into the calculation of a function characterizing the degree of reduction of weakened bases’ properties in order to determine the stiffness coefficient with load relief makes it possible to take into account the conditions of contact interaction between the slab and the non-uniformly deformed base. A program is developed to consider the load history of elements using nonlinear diagrams in the whole range of force and deformation effects. The results of simulating the slab’s operation on a non-uniformly deformed base under complex loads are obtained. The developed program allows determining the maximum load on the structure with known values of expected deformation effects and solving the opposite problem, i.e. determining the maximum deformation effects with constant external loads caused by structures.