COMPARATIVE ANALYSIS OF THE CALCULATION OF A REINFORCED CONCRETE PLATE FOR PUNCHING ACCORDING TO OLD AND NEW REGULATORY DOCUMENTS

Abstract

This work describes the characteristics of the constructive solution of the building. A photo of the interior is shown. An analysis of the features of interfloor ceilings is given. The operating conditions are analyzed. The causes of destruction of the shelves of ribbed slabs are considered. The current vehicle loads are determined. The values of concentrated loads are calculated. The calculation for the punching of the shelves is made according to the old design standards.  Conditions for the application of loads are clarified. The influence of the size of the load application sites is shown. The calculation for punching is made according to Eurocode 2. It is shown that the calculation according to Eurocode 2 more accurately takes into account the stress state of concrete. The dimensions of the main control section are determined. A punching model has been developed. A comparative analysis of two calculations is carried out. The stress state of the shelf is estimated using the finite element method. The theoretical and full-scale dimensions of the shelf damage zones are compared. A photo of the damage is shown. The conclusion is drawn on the decisive role of tensile stresses from bending. The option of reinforcing the shelf of the slab is proposed.