Metodologia simplificada aplicada à determinação de propriedades mecânicas em peças de madeira empregadas na construção rural

Abstract

The characterization of wood consists in the determination of its physical properties, resistance and stiffness through standardized performed which expensive and large equipment is used, available only at bigger research centers. In view this difficulty for the determination of physical and mechanical properties in wooden pieces, in some cases due to the socioeconomic aspects becomes unfeasible or ceases to be held. Therefore, the use of physical properties as a form of mechanical characterization simplified, becomes an important tool for the pre-dimensioning of structures aimed at rural buildings, that are normally employed away far from the big ones research centers. Among the properties used in the simplified characterization, stands out density. Thereby, the objective of this work was to synthesize simplified equations available in the literature and apply them in order to estimate the resistance and rigidity properties of Qualea spp. (Cambará) and Mezilaurus itauba Meissn. (Itaúba) for use in rural construction. For validation, the results found are compared with values obtained through essay performed according to the satandardized methodology proposed by NBR 7190/1997. Both species showed potential for structural use in rural buildings and similar areas. The mechanical properties of resistance characteristic to compression parallel to the fibers and the modulus of longitudinal elasticity, did not present significant differences. For shear strength parallel to fibers, the methodologies showed significant diferences.