An Analysis of Reinforced Concrete Flat Slabs with Concave Angles in Structures of Multi-storey Buildings Subjected to Horizontal Loads (Earthquake Load)

Structures of flat slabs without beams are not widely used in construction, especially in that of multi-storey buildings. In tall building structures, it is usually calculated that the floor is absolutely hard in the floor plane, receiving lateral loads and transferring it to the load-bearing structural system. However, in reality, the floor has finite stiffness and in many cases it has concave angles. Therefore, it is necessary to assess and check the work of the floor in the horizontal plane. When an earthquake occurs, the system designed to withstand earthquakes requires controlled translocation work by force of inertia against acceleration resulting from motion of the quantity of work. The bulk of the work concentrates on the roof and the floor. So the floor is a vital part of an earthquake-resistant design which must be fully calculated. So the article studies the work of reinforced concrete flat slabs (the floor without beams), especially when there are concave angles in multi-storey building structures bearing earthquake loads