BEN CHIEKH, SeddikCHAICHE, Sofian2024-05-282024-05-282021https://dspace.univ-ghardaia.edu.dz/xmlui/handle/123456789/7134In this research (study of building R+3 of steel structure), we designed an urban building consisting of three floors and the ground floor, In the design of the building we relied mainly on steel structures with the combination of the concrete roofs and the walls of bricks . We presented the total dimensions of the building and selected the materials used, then calculated the loads and ensured the design. After the feasibility study, we found that this type of building is economically costly, but it is more effective and consumes much less time than the concrete buildings, however the steel structures are widely used in military builds such as the military barracks of the National Gendarmerie in Al-Meniaa.planchers welding steel-concrete floorsOther