Abstract
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.
Highlights
The results of studies of flat plate’s resistance to punching are presented in the works of many authors, among which are the works [1,2,3,4,5,6,7,8]
The results of study on finite element model of multi-storey building showed that the ratio of bending moment and punching force M / N varies in the range of 0.25-0.35
For the test sample models, concentrated forces were applied to the plate in such a way that M / N ratio varied in the range 0.29-0.31, depending on ratio of the sides of column’s section
Summary
The results of studies of flat plate’s resistance to punching are presented in the works of many authors, among which are the works [1,2,3,4,5,6,7,8]. One of the issues to be addressed in the test procedure is the correct pattern of sample loading. The correct pattern of loading samples involves creating in the sample fields of forces and displacements, which correspond to the maximum extent of the distribution of forces and displacements when loading the operated structure. When testing the samples of plates for punching, various loading schemes are implemented. With the central location of the loading area relative to the center of gravity of test plate, only normal force N is transferred to the plate. When the loading area is located on the edge of sample plate, the normal force N and the bending moment M are transferred to the plate. Part of the moment acting in the column is taken into account when calculating the plate for punching [9,10,11,12]
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