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The European Standard [1] for design of concrete compressed slender members shows a significant deficit in global reliability for the design method based on non-linear analysis. The experimental investigation at the Faculty of Civil Engineering SUT in Bratislava was planned for slender concrete columns made of different concrete strength classes - C45/55, C70/85 and C100/115. A basic aim of the analysis was to design concrete columns subjected to bending moment and axial force where the stability failure proceeds at the compression strain 1.5 ‰. The first of three series of experimental and numerical analyzed columns is presented in the paper. The experiments were realized at the Faculty of Civil Engineering SUT in Bratislava with cooperation of ZIPP Bratislava LTD Company.

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The presented paper brings comparison of design accuracy of slender concrete column coming from levels of approximation after MC 2010 and SIA 262, which are compared with the Method of nominal curvature for calculation of 2. order moment after EN 1992-1-1. Results were also compared with nonlinear analysis accounting for 2nd order effects, nonlinear behavior of concrete in compression and influence of cracking, creep and shrinkage.

The presented paper will bring new aspects of punching resistance verification of concrete column footings and foundation slabs coming from influence of ground stresses distribution on punching verification of flat footings and from new design criteria which depend on the maximum punching resistance defined from crushing of concrete struts (a criterion for limitation of maximum shear forces at the vicinity of the columns) and on the maximum punching resistance defined from shear-bending failure with shear reinforcement, limited by coefficient kmax.