ABSTRACT
This paper presents the design for roofing using the "Howe" type truss and the "roxinho" ( Peltogyne sp., Leguminosae ) and "maçaranduba" ( Manilkara sp., Sapotaceae ) species that are available in the Campina Grande, Paraíba market, for the construction of the structural design of chicken sheds, considering the recommendations set forth by the NBR 7190/1997 technical code. Two different chicken sheds are described herein: the first shed has brick walls and artificial ventilation, and the second has open walls and a longitudinal wind tunnel. Both sheds are 12 m wide and 125 m long. Due to globalization of the economy, the choice of architectural design was based considering parameters of comfort, handling, cost and rational use of wood. The types of roofing structure are composed of trusses comprising chords with single 7.5 x 12.5 cm cross sections, diagonals with single 7.5 x 10.0 cm cross sections and struts with double 3.5 x 12.5 cm cross sections, and purlins with 7.5 x 15 cm cross sections. Both sheds have 7.5 x 12.5 cm cross section bracing and 2.72 m spacing between trusses. The results obtained indicate that this type of structure uses less wood per square meter of covered area and costs less.
Key words:
roofing; timber structure; poultry shed