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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Design and Experimental Analysis of NLT Trussed Rafter in Yellow Pine
Author(s)
Emanuelle Graça Recco1, Jorge Daniel de Melo Moura1 and Everaldo Pletz2
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DOI:10.17265/1934-7359/2017.01.003
Affiliation(s)
1. Center of Technology and Urbanism, Department of Architecture and Urbanism, Londrina State University, Londrina CEP: 86057-970, Paraná, Brazil
2. Center of Technology and Urbanism, Department of Structures, Londrina State University, Londrina CEP: 86057-970, Paraná, Brazil
ABSTRACT
The roof system of social housing in Brazil generally
consists of components made out of native forest lumber of high market value.
Taking into account the increasing number of planted forests and the need to
develop new products and to add value to this timber, this work deals with the
development and structural analysis of a roof system using yellow pine
plantation wood (Pinus spp), a
sustainable material which however presents many defects. The NLT (laminated
nailed timber) technology was chosen as
it allows the use of shorter length and smaller cross section pieces,
eliminating major defects. Seven samples of structural trussed rafters in NLT
were tested; six made out of graded timber and one ungraded in order to verify
the impact of the wood grading in the structural performance of the model. The
results showed that the trussed rafter system in NLT meets the necessary
structural performance requiring poor conditions of infrastructure for
manufacture process, and that the graded wood samples showed better performance
than the ungraded one.
KEYWORDS
Roof systems, yellow pine wood, laminated nailed timber, trussed rafter, design methodology.
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