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The results of researches on finite-element models of stress-strain state of flat reinforced concrete slabs of beamless frame under punching by columns of square and rectangular cross-section are presented. The purpose of the study was to develop a technique for testing samples plates for punching in the presence of bending moments in a column. The results of the study of deflections of reinforced concrete slabs, the distribution of bending moments in the punching zone of the plate under various loading schemes are presented. Variable parameter was the ratio of the sides of the column cross-section. Comparative analysis of studies results on finite element models has made it possible to choose the optimal variant of applying the load to the test samples, depending on the aspect ratio of rectangular section of column. Results of the conducted research will allow simulating the stress-strain state in the punching zone of natural reinforced concrete slabs of monolithic beamless frame during the test of samples.

In this work the deformation analysis of a flexible cable is considered in detail. Nonlinear finite element analysis is used for solving the problem. In deriving the final form of equations, geometrically nonlinear analysis is used and validity of simple Hooke’s law is assumed. The resulting nonlinear algebraic equations are solved by using simple iteration method. Numerical examples are considered.

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In this paper we analyze a simply-supported plate under the action of transverse uniform pressure. The Mindlin theory of moderately thick plates is used for analysis. Different boundary conditions are considered at the edges of the plate and their effect on the solution, in particular, shear forces, is studied. Only finite element results are presented.