Design analysis of strengthening a damaged supporting structure in a swimming pool building

The issue of strengthening the supporting structure of the swimming pool building, with a special attention on damaged reinforced concrete pillars in the sub-pool, is presented. The technical condition of those pillars in the basement of the swimming pool was defined as the risk of structural collapse. Numerous cracks and the occurrence of deformation of reinforcing bars were noticed. Three columns were damaged in basement rooms. First of all, the cause of damage was determined. The actual load carrying capacity of the built pillars was checked. To this aim, the geometry of the columns was checked first and the actual strength class of built-in concrete. It was found that all columns were made of concrete of the same strength class and good homogeneity of concrete, but this concrete did not meet the standard requirements as a construction material for reinforced concrete structures. The new supporting structure was designed in the form of four-leg cross-sections made of an isosceles angle profile. Due to structural damage, an additional safety factor was adopted, increasing the total load per pillar by 50%. This approach took into account the possible redistribution of loads in the building structure that occurred as a result of damages.