NUMERICAL ANALYSIS OF LONGITUDINAL REINFORCEMENT EFFECT ON RC SLAB PUNCHING SHEAR RESISTANCE BY STRENGTH AND CRACK PROPAGATION CRITERIA

Abstract

he article deals with the influnce of longitudinal reinforcement of the support zone of reinforced concrete slabs on the strength and crack resistance under the criterion for punching failure. The evaluation of impact was carried out by the method of numerical studies based on finite-elementcomputational technologies. The results of physical experiments published in the scientificliterature are taken as the basis for the conducted research. The existing provisions of the existing domestic and foreign standards for the calculation of slab reinforced concrete structures according to the criterion for punching failure are considered. The main provisions of the applied finit element approach are presented, verificationis performed and the correctness of the applied technique is justified In the numerical studies, the forecast of strength and crack resistance was done for considered reinforced concrete slab structures; the results of numerical studies were compared with the data from physical experiments and the evaluation results based on the relevant domestic and foreign regulations. According to numerical studies results it was stated that longitudinal reinforcement of the tensile zone of slab structure has a significantimpact on both the level of load-bearing capacity and the scheme of crack formation and propagation. The results of the implemented studies justify the necessity to revise the national standards of structural analysis for reinforcement concrete slab structures under the criterion for punching failure.

Keywords

• modeling, numerical methods, design model, stress-strain state, reinforced concrete structures, punching failure