Method for calculating deflections of beams made of rubber concrete

Abstract

Abstract In many bending elements, the defining calculation for ensuring the normal operation of the structure is the calculation of deflections, it is this characteristic of the structure, in particular the beams, that determines the section dimensions of the element, to ensure the necessary rigidity of structures. In view of this, the use of many polymer concrete as a material for the manufacture of bending structures becomes impossible due to the high deformation-as a consequence of the low elastic modulus. Our proposed polymer concrete based on liquid rubber (rubcon) has high compressive and tensile strengths, while the elastic modulus corresponds to ordinary cement concrete class B25. The introduction of fiber filaments into the material structure slightly increases these characteristics, and the rubber concrete obtained in this way with fiber reinforcement is called fiber rubcon. In order to ensure the possibility of calculating by way of determining the deflections of rubcon structures with cracks, we apply the principle of strain averaging of V.I. Murashov, while the uneven distribution of strains in the rubcon was taken into account by the coefficient ψk, the polymer concrete work between cracks is taken into account by the coefficient ψs, which are determined similarly to V.I. Murashov, A.S. Zalesov methods.