Comparative Study of Wood Consumption in Structures of Concrete Roof

Abstract

Several factors suggest wood use in construction field and, among them, highlight mentioned material's versatility and availability, widely used in roof structures. In some situations, carpenters are responsible for implementing these structures and are almost never designed according to normative precepts. This study shows relation between timber volume and construction area (in plain view) with concrete roof structures and spans ranging from 8 to 14 meters, with bolted connections, relative to C30 strength class, from standard ABNT NBR 7190 recommendations. Based on these values, it is presented a comparison about consumption usually obtained by active technical professionals in Sinop-Mato Grosso State, Brazil, from a study case of a shed in Forest Park of Sinop. Results show a mean consumption of 0.025 m 3 /m 2 for the considered span. Thus, there was a 21% decrease in timber volume (span of 14m) and 50% in raw material (timber) coast when compared mentioned park structure. Covers projects were made with C30 species, about 30% less resistant than employed in the shed. In addition, there was a 50% reduction in pillars and foundations number compared to shed.