Technical Feasibility Study of the Use of Softwoods in Lattice Structure “Howe” Type for Roofing (Gaps between 8-18 Meters)
Gabriel Oberon Bertoldi Oliveira
Department of Civil Engineering, State University of Mato Grosso (UNEMAT), Sinop, Brazil.
Roberto Vasconcelos Pinheiro
Department of Civil Engineering, State University of Mato Grosso (UNEMAT), Sinop, Brazil.
Felipe Nascimento Arroyo
Integrated Colleges of Cacoal (UNESC), Cacoal, Brazil.
Diego Henrique de Almeida
Department of Civil Engineering (DECIV), Federal University of Rondônia (UNIR), Porto Velho Campus, Porto Velho, Brazil.
Tiago Hendrigo de Almeida
Department of Science and Material Engineering, São Carlos Engineering School (SMM), São Carlos, Brazil.
Diogo Aparecido Lopes Silva
Department of Production Engineering, Federal University of São Carlos, São Carlos, Brazil.
André Luis Christoforo *
Department of Civil Engineering (DECiv), Federal University of São Carlos, São Carlos, Brazil.
Francisco Antonio Rocco Lahr
Department of Structural Engineering (SET), São Carlos Engineering School, São Paulo University (EESC/USP), São Carlos, Brazil.
*Author to whom correspondence should be addressed.
Abstract
Introduction: Wood is a material of biological origin widely used in construction, and its mechanical properties allow the material to form the lattice structure of roofs used in warehouses of industrial use, however, the paradigm as to the behaviour of the material makes the design decision less susceptible.
Aims: This work intends to verify the feasibility and optimize the use of unconventional wood in triangular roof truss structures in regions of flat topography, with a characteristic wind speed of 30 m/s.
Methods: The design methodology was fully based on the recommendations of ABNT NBR 7190
For the elements dimensioning, it was necessary to define the geometric and structural parameters that directly influence the actions and loads, as well as the behaviour of the structural elements.
Results: The choice of wood in this context, it was proposed the elaboration of projects of roofing structures with the following characteristics: "Howe" latticework (inclination of 10º - steel roof tile); Spans of 8, 10, 12, 14, 16 and 18 meters (ratio width: length, in plan, environment of 1: 3); Typology of the lateral openings of the building - (relationships between main opening area: other openings) 1:1, 2:1, 6:1 and insulated coverings (coverage on a medium of reduced dimensions).
Conclusion: The ratio of the volume of wood per floor area (m³.m-²) for C20 and C30 grade timber was determined, as well as the consumption of metallic pins per floor area, following the requirements of Brazilian standards, proving the technical feasibility.
Keywords: Wood, roofing structures, Howe truss, lattice structure, Brazil