Abstract:The article handles potential approaches to design and determination of total load capacity of foundation slabs and floors. The research is focused on punching shear failure of reinforced ground supported slab. The article presents detailed results of the experiment made and advanced numerical modelling based on nonlinear analysis and application of fracture-plastic model. The experiment made included a 2.0 9 1.95 m reinforced concrete slab-on-ground of 120 mm thickness. The experiment was followed by a parametric study of total load capacity calculation with nonlinear analysis which is supplemented by calculations based on existing design model code.

In November 2013 an experiment was carried out using the testing equipment called stand. During the experiment was loaded steel-fiber reinforced concrete foundation slab model. The stand measures deformation and monitors interaction between stress and deformation. The purpose of this paper is comparison of values measured during the experiment and results of numerical calculations based on FEM. The stress strain analysis of elastic halfspace by means of Gauss numerical integration and Jacobean of transformation is presented here. The objective of this paper is also improving and developing the soil-structure interaction analysis based on the experimental results and FEM.

For decades attention has been paid to interaction of foundation structures and subsoil and development of interaction models. Currently there are several software that, can deal with the interaction of foundations and subsoil. The purpose of this paper is to compare resulting deformation of the slab, subsidence of the subsoil, bending moments and contact stress calculated by two different software based on FEM calculations. Calculated deformation of the slab is compared with deformation measured during experiment.

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The influence of the physically-nonlinear behaviour of the structure and interaction between the upper structure and foundation are the aspects which influence the results of the subsoil-structure interaction analysis. The experimental measurement of stress and strain and monitoring of stress-strain relations by interaction of foundation structures with subsoil are also performed at the Faculty of Civil Engineering, VŠB-TU Ostrava. Numerical analyses of contact task was made with FEM. The test sample for the task was a steel-fibre reinforced concrete foundation slab model loaded during experimental loading test. The calculated values of the subsidence do not correspond to the measured values of foundation subsidence of existing buildings, or values measured during the experiments. Results of the solutions are also different and depend on the choice of the model of the subsoil. Using several FEM software tools were made numerical analyses. Results of FEM analyses were also confronted with the values measured during the experiment.