FINITE-ELEMENTAL ANALYSIS OF INFLUENCE OF DAMAGES OF BEAMS ON THE GENERAL TECHNICAL CONDITION OF MONOLITHIC REINFORCED CONVERGENCE

Abstract

Purpose. To perform a simulation to estimate the impact of corrosion damage to the reinforcement of monolithic reinforced concrete flooring on the bearing capacity of a unit width of overlap and overlap in general. Methodology. The integral monolithic reinforced concrete overlay of the boiler house with overall dimensions of 12 × 12 m was to be investigated. The grid of the column was 6 × 6 m. The damage in the form of complete destruction of the protective layer of concrete of one of the 12 secondary beams and corrosion damage to 30% of its bearing reinforcing bars was investigated. Numerical simulation of stress-strain state of reinforced concrete structures was performed in the training version of the NASTRAN Femap 10.1.1 SC 32bit system. Two types of calculation are carried out: 1) calculation of a plate of unit width (in accordance with current regulatory documents); 2) calculation of the entire reinforced concrete floor (taking into account its joint work). Findings. The following is revealed: calculation № 1 proves the necessity of arrangement of strengthening of damages of a secondary beam of monolithic reinforced concrete floor. After the device is strengthened by the cage from the corners of the secondary beam, the stress is reduced both in the reinforcement and in the reinforcing bars to the stress level in the undamaged slab. Calculation № 2 shows that the arrangement of reinforcement of the clip from the corners of the secondary beam with cored reinforcing bars, taking into account the joint work of the whole plate, is not needed. Originality. Numerical modeling of the stressed-deformed state of reinforced concrete slab of unit width taking into account damages and the entire monolithic reinforced concrete slab is carried out, and the obtained results are analyzed. Practical value. The order of creation of models of reinforced-concrete designs and their finite element analysis is briefly given.