Análise da competitividade econômica entre vigas de concreto protendido e vigas de concreto armado submetidas a vãos definidos
In view of the growing use of prestressed concrete elements in Brazil, the recurring architectural requirements that subject structural elements to free spans, challenging loads and the need for technological innovations that seek to generate savings, there is a certain level of uncertainty among...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/45333 |
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| Resumo: | In view of the growing use of prestressed concrete elements in Brazil, the
recurring architectural requirements that subject structural elements to free spans,
challenging loads and the need for technological innovations that seek to generate
savings, there is a certain level of uncertainty among the members of the civil
construction as the real economy provided by the use of prestressed concrete
structures to the detriment of the conventional concrete structures. Thus, this study
seeks to analyze the economic competitiveness between prestressed concrete beams
and reinforced concrete beams by submitting them to free spans, with increasing
distances at each meter, from 5 to 10 meters, and loads typical of commercial
buildings. For this, a calculation model was elaborated for the dimensioning of the
reinforced concrete and prestressed concrete parts through spreadsheets in the
Microsoft Excel software and, subsequently, the extraction and quotation of the inputs
involved was carried out, according to the databases SINAPI and ORSE. Assessing
the overall cost of making the beams, with all the materials involved, prestressed
concrete beams were more attractive than conventional reinforced concrete beams
from 6 meters of span, ranging from 5% in 6 meters, at 15%, in 10 meters. Specifically,
for the cost of concrete volume and form area, savings of up to 35% and 30%,
respectively, were observed for the 10-meter span. In addition to being economical,
prestressed concrete beams presented advantages related to durability, as they had
arrows ranging from 0.01 to 0.44 centimeters, while reinforced concrete beams ranged
from 1.83 to 3.61 centimeters. Notably, it was possible to conclude that, the increasing
increase in the free span of the pieces indicated for prestressed concrete more
economical and useful life advantages than those of conventional reinforced concrete. |
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