Stress-strain state of concrete element with damage

Abstract

Problem statement. At present, it is relevant to determine the technical condition of structures and their strengthening as needed. Damage of structures affects the process of determining the physical and mechanical characteristics of concrete structures. Purpose. To determine the effect of structural damage on the stressed state of the structural member. To perform calculations and obtain fields of stresses, strains and displacements at different model parameters and stress levels. The technique. The research has been performed on structural models using software systems "LIRA SAPR". A structural model having dimensions of 100 × 100 × 400 mm was used for the study. Materials of concrete C16/20, C18/22.5 and C20/25 with corresponding properties have been used. The structural damage was modeled by sequentially removing one of the five elements from the experimental model. The calculations were performed for models with one and two defects in the design. For the experimental model with two defects, the grooves were arranged in parallel. The load parameters for modeling the deformation process varied within 0.1…0.5 of the limit stress. Results. Analysis of the results of the study shows that the change in stress in the area adjacent to structural damage is affected by the size of this area, the level of stress-strain state in the structural element and the relationship between the sizes of adjacent structural elements; Zero voltage zones may appear on the surface of the structural member; it is necessary to take into account the level of stress-strain state when assessing the physical and mechanical characteristics of concrete using non-destructive methods of control in the area affected by existing structural damage.