Análise comparativa de sistemas estruturais de um projeto com laje lisa em concreto armado e laje lisa em concreto protendido

Abstract

Within the different structural systems, there are different techniques for creating slabs. With the different types of slabs, there is the smooth flat slab, which aims to overcome larger free spans without the need for beams. Flat slabs can be built in different structural systems, in Reinforced Concrete (CA) and Prestressed Concrete (CP). Andrade (2016) states that the association between concrete and reinforcement must resist stresses, which are guaranteed by the adhesion between the materials in the CA. The CP has tendons to create compressive stresses in the concrete in the region where it would be pulled. This work aims to compare both solutions for flat slabs, regarding the quantity of steel, formwork and concrete. So we have a ready-made project for a building with flat slabs designed in prestressed concrete, and dimensioned with the same layout as flat slabs in reinforced concrete, in the Eberick software. Material reports from the reinforced concrete project were then extracted and compared with data from the prestressed concrete project. In general, both solutions have very similar amounts of formwork and concrete, however, the amount of steel in the CA project was much higher than in CP, and the thickness of the CA slabs was much greater. A solution was then sought to reduce these thicknesses a little, by adding some beams, which gave good results, however, the CP system still used smaller amounts of steel.