Due to its great availability in planted forests in Brazil, Eucalyptus saligna appears as a good species to be exploited, in order to assist in the consumption of wood for construction purposes. The aim of this research was to determine the physical and mechanical properties of Eucalyptus saligna wood species for its use in civil construction. The evaluation was based on 16 physical and mechanical properties obtained according to ^{NBR 7190 (1997)} standard. Two values of moisture content were considered: 30% (above the fiber saturation point) and 12% (equilibrium moisture content) according to ^{NBR 7190 (1997)}. All obtained results obtained were statistically analyzed according to the t-test at the 5% level of significance. In addition, the characteristic strength properties were also determined, for batch classification in the strength classes recommended by the Brazilian standard. Eucalyptus saligna had an apparent density of 0.58 g/cm³ and a basic density of 0.73 g/cm³. The mechanical properties, presented f_c0 and f_c0,k equal to 46.80 and 32 MPa, respectively. The results indicated that Eucalyptus saligna wood can be used in the construction of timber structures as structural member

The knowledge about anisotropy of wood possibility more security design of structures and structural members designed. Therefore, there are little quantity of results knowledge about shrinkage and anisotropy coefficients of Wood species, motivating the development of new researches. The aim of research is evaluate the possibility of estimate the full shrinkage (radial; tangential; volumetric), anisotropy coefficient and shrinkage coefficient (radial; tangential; volumetric), using polynomial regression models (linear; quadratic; cubic) and exponential, by density of five Wood species (Cedro Doce [C20]; Canafístula [C30]; Angelim Araroba [C40]; Mandioqueira [C50]; Angelim Vermelho [C60]), properly classifieds in five strength classes for dicotyledonous according Brazilian Standard ABNT NBR 7190:1997. The better results were from tangential and volumetric retractions both using exponentials functions, justified by lower values of variation coefficients, with coefficients values of determination adjusted ranging from 51 and 54%. Even considered significant to the regressions for the tangential and volumetric shrinkage by analysis of variance, but with adjusted coefficients of determination lower than 70%, news researches should realized with other Wood species, enabling find general expressions for estimating such properties using the knowledge of the density.

Wood is a renewable material, presenting wide use in building construction. For its better employability, it is necessary to perform physical and mechanical characterization of the several species available for application. In this respect, Brazilian Code ABNT NBR 7190:1997-Timber Structures Design, in its Annex B, prescribes the proper tests and adds some relations between properties and strength classes for coniferous and dicotyledonous. The strength classes are function of characteristics values of strength in compression parallel to grain (f c0). However, density is a more easy-determination property and the cited Code presents the mean value of density for each strength class. Therefore, this research aimed to evaluate the possibility of inferring f c0 based on density obtained on tests of three Brazilian tropical wood species: Canafístula (Cassia ferruginea); Angelim araroba (Vataireopsis araroba) e Castelo (Gossypiospermum sp.). Statistical procedures shown it is possible to conclude that, in some cases, density is not a good estimator of f c0 .

Este trabalho tem com objetivo avaliar a integridade das estruturas que fazem parte da cobertura de um galpão de 70 anos, destinado ao estoque de produtos químicos, localizada no Estado de São Paulo (Brasil), e apontar possíveis soluções para os problemas identificados. Buscou-se estimar a influência dos resíduos dos produtos químicos depositados nas superfícies dos elementos estruturais e identificar a espécie de madeira utilizada no projeto, por meio de ensaios físicos (densidade aparente) e mecânicos (compressão e cisalhamento paralelo às fibras. Os problemas identificados foram: (a) umidade devido a telhas quebradas; (b) deterioração superficial da madeira em função de reação química entre os produtos armazenados e a estrutura; (c) cavilhas de madeira com instalação incompleta; (d) falta de mãos-francesas em algumas terças; (e) travamento inadequado das treliças; e (f) deterioração de pregos de fixação por oxidação. Pelas observações realizadas, as soluções indicadas são de fácil execução, pois as estruturas não foram severamente prejudicadas. Com relação à espécie de madeira, os resultados das propriedades mecânicas obtidas associadas à densidade aparente apontaram para a espécie Peroba-Rosa (Aspidosperma polyneuron). A análise estatística de resultados apontou para a não influência do produto químico no desempenho da estrutura do telhado.

Shrinkage and coefficient of anisotropy are fundamental physical parameters in analysis of dimensional stability of timber structures members. In Brazil, properties of wood are obtained according to assumptions and calculation required by Annex B of ABNT NBR 7190: 1997 (Timber Structures Design). Among the physical properties, density appears as the easiest one to be experimentally obtained, defined by ratio between mass of the sample and its volume. To evaluate the possibility of estimating shrinkage (longitudinal, RL; radial, RR; tangential, RT; volumetric, RV; and coefficient of anisotropy, CA) of wood depending on density, this study aimed to test regression models (linear, exponential, logarithmic, geometric) using basic density (ρ_bas) and apparent density (ρ₁₂) as independent variables. For this purpose, five wood species belonging to conifers: Pinus sp., Pinus oocarpa; and dicotyledonous: Paricá (Schizolobium amazonicum), Jatobá (Hymenaea sp.) and Lyptus®, were employed. In all, 23 samples for Pinus sp.; 15 for Pinus oocarpa; 28 for Paricá; 16 for Lyptus®; and 11 for Jatobá were produced, totaling 651 determinations. Results of analysis of variance for regression models indicated insignificance of the adjustments obtained by adopting densities as estimators of shrinkage and coefficient of anisotropy for this set of wood species. Only models involving basic density and apparent density were significant, wherein the optimal settings were from linear case, exhibiting coefficient of determination (R²) 91.72% (for softwoods) and 83.36% (for hardwoods).

This research aimed to evaluate the physical properties of OSB panels manufactured using Paricá (Schizolobium amazonicum) wood species particles, treated with CCA (chromated copper arsenate) and CCB (chromated copper borate) preservatives, and castor oil based polyurethane resin. Three resin contents were evaluated: 8, 10 and 12%. Results showed that OSB panels manufactured with CCA-treated wood particles did not meet the minimum requirements stipulated by EN 300Code, while OSB containing CCB treated wood particles reached the properties values required for structural applications in dry conditions. Therefore, it was demonstrated the feasibility of using CCB-treated Paricá wood and castor oil based polyurethane resin in OSB production.