ESTUDO COMPARATIVO DOS CUSTOS DE EDIFÍCIOS DEVIDO À VARIAÇÃO DA RESISTÊNCIA CARACTERÍSTICA DO CONCRETO

Abstract

As Brazil’s levels of urbanization rises, the verticalization process of the buildings rises as well, that way the need for the evolution of the materials’ characteristics and the technologies used in the civil construction has increased. It’s in this scenario the use of concrete with high compressive strengths has intensified. In this study, a comparative analysis was developed between different structural models, aiming to analyze the general effects, besides the effects on the costs of the structures that the concrete resistance’s change can provoke. Three structural models were made, each with 10, 20 and 30 floors, and for each model were proposed three cases, varying the characteristic strength of the structure at 25, 35 and 50 MPa. Initially, a bibliographical review of the main aspects related to the designing of structure’s projects was done. After that, the methodology adopted by the whole study was presented, highlighting the requirements of the main Brazilian’s standards related to the subject. Next, it was shown the pre-sizing, as well as the sizing in the software Eberick, demonstrating the difficulties experienced and the solutions adopted. Finally, we presented the results found and the analyzes that we can deduce from these results, so it was possible to prove the steel’s decrease in all structural elements as the fck of the structure was increased. Besides that, the influence the resistance of the concrete has on the global stability and final costs of the structure became evident.