ESTUDO DAS PERDAS DE PROTENSÃO EM LAJES ALVEOLARES PROTENDIDAS

Abstract

Due to the complex way of verifying the prestress loss that occurs in honeycomb panels, calculators use an average estimate of this loss. The objective is to use equations with the support of standards to verify the initial and deferred prestressing loss rates for different types of slabs. Two different groups of slabs were selected for this verification, with three slabs in each group. In the case of initial prestressing losses, the first group of slabs reached an average percentage of 6.59% and a standard deviation of 1.65%, while the second group averaged 5.75% and a standard deviation of 2.47%, Regarding the general analysis of initial prestressing losses, a total mean of 6.17% of initial loss was obtained, with a standard deviation of 1.94%. Taking into account the standard deviation, it can be considered that the results for initial losses were within the forecast (5%), however, for sizing purposes it would be reasonable to increase this recommendation to at least 8% of initial loss. For the deferred loss of 15% proposed by the literature, all the slabs analyzed were within this percentage, proving that the percentage presented to the author meets the losses predicted by numerical analyses.Versão do resumo em inglês, em bloco único.