Estudo comparativo entre uma estrutura com laje convencional em concreto armado e uma estrutura com laje plana lisa protendida: estudo de caso de um edifício residencial multifamiliar na cidade de Pato Branco – PR

Abstract

This work has the purpose of making a comparative study of the amount of materials used in the design of a multifamily residential building using two different methods: structure with reinforced concrete slabs, and structure with prestressed flat slabs. The structure with prestressed slabs uses greased chordae. Already, the conventional solution with reinforced concrete is composed by columns, beams and slabs. The main goal of this work is to make a comparative study of the amount of materials used in each of the floor-type for each case, considering that the original project of the building, designed for prestressed slabs, was developed with the support of a structural design software, called CAD/TQS, then the floor-type was redesigned for a solution with columns, beams and reinforced concrete slabs, in which the structural analysis for getting the stresses of the elements and the global stability of the building was developed with the support of SAP2000, according to the prescriptions of the Brazilian standard NBR 6118:2003 – Design of Structural Concrete - Procedure. For the building object of this study, the consumption of steel and wood molds for concrete, for the prestressed slab solution, was close to that of the reinforced concrete solution. However, in the consumption of concrete, the prestressed concrete slab presented at about fifty percent higher than the conventional slab.