Design, resistance, design load, assembly and user manuals of trusses fabricated with Gmelina arborea and Hieronyma alchorneoides wood from forest plantations trees in Costa Rica Two pratt-type trusses were constructed using Gmelina arborea (melina) and Hieronyma alchorneoides (pilón), designed with spans of 6 m and 9 m between bearings and using two types of joints: nails and screws. The trusses were subjected to bending loads in order to establish the resistance values to derive the design tables to be

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