Influence in the budget of a building structure due to alterations in the standard ABNT NBR 6118:2014

Resumo

Knowledge obtained in research and project practice contributed to upgrade the Brazilian standard regarding the dimensioning of concrete structures in 2014. The objective of the study is to evaluate the influence in the budget on the structure of an edifice due to changes in the standard ABNT NBR 6118:2014: use of different aggregates and of high-strength concrete. A building structure of reinforced concrete sized according to standards ABNT NBR 6118:2007 and ABNT NBR 6118:2014, considering different hypotheses. The simulations were performed with the software AltoQi Eberick (2014). The quantitative materials (steel, concrete, forms and expanded polystyrene to slabs) and inputs budget for structure were performed for each simulation. The type of aggregate influenced up to 4.60% of cost of the structure and up to 0.82% in overall cost in comparison with previous version of the standard. The use of C60 concrete compared with to C25 increased the budget of the structure (For the same aggregate type, the increase was, in average, of 14%). Although the use of steel and molds reduced (averaged 5%), it was not sufficient to eliminate the difference in the cost of concrete for edifice analyzed.