The thesis analyzed and projecting the characteristic elements of reinforced concrete loadbearing structures of residential buildings in Novo mesto. The building has been upgraded to the existing building and is separated from it by 8 cm dilatation. The supporting structure of the building is designed as a frame structure, consists of slabs, roofs, beams and pillars. The supporting structure has been designed under the old Yugoslav regulations. Within the thesis we analyze the typical slab structure and the selected elements of the vertical load-bearing structures. For this purpose, we produce two idealized computational model of the structure in the program SAP2000 based on the finite element method. In the analysis of floor
constructions in addition to its own and permanent weight considering the useful load. In the analysis of vertical load-bearing elements additionally considering horizontal seismic influence, which is greatest by the impact. Carried out an impact analysis of brick fillers on their own swings and stresses in the structure. Below we show more details of the design and dimensioning of reinforcement in the present typical slab structure and comparison with reinforcement from the existing project documentation. We also show sizing and design of reinforcement of selected elements of the vertical load-bearing structures. Load- earing elements were designed according to method of capacity design. Reinforcement drawings were made for analyzed structural supports.