Mechanical performance in flexure for two spans of trusses from Hieronyma alchorneoides and Gmelina arborea woods fastened with nails and screws

Abstract

The present study had the objective of determining the behaviour of Pratt-type trusses made from Gmelina arborea and Hieronyma alchorneoides lumbers relative to loads, displacement and design load stiffness using two types of fasteners (nails and screws) for two spans (6 and 9 m). It was found that the maximum load values were greater in H. alchorneoides lumber trusses than G. arborea. Design strain values showed that trusses fabricated with H. alchorneoides wood had higher design properties than G. arborea. The trusses with a 6-m span showed strength and design strain values greater than those with a 9-m span, but lower displacement values. No significant differences appeared in the different types of fastener used. Nonetheless, the load vs. strain behaviour suggested that trusses fabricated with screws presented better properties than those fastened with nails.

Influence of roof slope on timber consumption in plane trusses design

“…Wooden structures in roofing systems are frequently investigated. There are countless variables studied: stability, buckling lengths, and bracing of flat trusses (Burdzik and Skorpen 2014;Sejkot et al 2019); structural behavior in the face of stresses arising from the wind action (Stevenson et al 2019;Navaratnam et al 2020); rigidity and behavior of connections in flat wooden trusses (Tenorio et al 2018;Rivera-Tenorio and Moya 2019); and structural and cost optimization in mechanical connections of flat wooden trusses (Olsson 2010;Villar et al 2016;Villar-Garcia et al 2019).…”