Análise do impacto e da variabilidade dos custos da mão da obra na execução de estruturas de concreto

Abstract

A solution used in most of Brazil's high-rise buildings, concrete structures are one of the most significant elements in the planning of a work, both because of the high cost of this stage and the time spent in the execution. Thus, this work focuses on one of the components in the cost of concrete structures, labor, assessing how much this component weighs on the structure, what level of predictability of this component and how much this component varies between different ventures, analyzing factors that can indicate correlations between this cost and other parameters of the work. After analyzing a set of 28 distinct projects in the city of Fortaleza, the percentage cost of 20% of the total cost per square meter was calculated as a result of the manpower in the structures. For these same works were estimated, through the compositions of inputs, how much would be the cost with the collaborators. For this sample, the actual results were, on average, 30% lower than expected. Finally, a set of 103 works were analyzed with the objective of identifying factors related to a lower cost, in this case some items presented tendencies to reduce the cost. These items were: shorter cycle time, greater floor area, less proportional team, and use of procedures that allow the use of less qualified teams