The aim of this work is to determine the main mechanical properties, related to timber structures design, of the Brazilian tropical wood specie:Dipteryxodorata(Aublet) Willd. Tests were conducted according to the guidelines of the Brazilian Code ABNT NBR 7190: 1997 "Design of Timber Structures". Specimens were obtained from a so-called homogeneous clear wood lot, with moisture content around 12% . Mean values ​​of strength and stiffness properties confirmedDipteryxodorata(Aublet) Willd as a good alternative for structural uses.

Wood engineered products are alternatives to the use of timber for civil construction, manufacturing, and the furniture industry. One of these products is the medium density particleboard (MDP) panel, which is made of wood particles and resin under high temperature and pressure. This research produced a prototype to evaluate the use of MDP panels waterproofed by castor oil-based polyurethane resin and Pinus sp. residues treated with CCB preservative for use as a wall coating. The influence of weathering, position of wood panel, and waterproof treatment were evaluated. Panels were made under the requisites of Brazilian Standard ABNT NBR 14810 (2013) and evaluated with international standards. MDP panels met standard requisites, with properties similar to that reported in the literature, indicating the possibility of use as wall coating. Statistical analysis indicated the only significant factor was weathering, which influenced physical and mechanical properties.

OSB (oriented strand boards) are wood based products that substitute plywood boards, usually used as structural elements, especially with part of formwork for reinforced concrete members as beams, slabs and columns. In this context, the stiffness properties are highly important. This study aimed to evaluate, with the aided of three points static bending test, the modulus of elasticity of OSB using recommendations of the European Standard EN 310:1993, combined with an alternative method of calculation based on the least square method. In this case, three displacement values are taking in account to stiffness determination, improving reliability on it. Results of the ANOVA indicated no statistical equivalence between moduli of elasticity obtained by the two methods of calculation. Modulus of elasticity of this technique proved to be 7% lower than the elastic modulus obtained by standard EN 310:1993, revealing be important the use of suggested approach.

This work aimed to evaluate the bending strength (MOR) and the bending modulus of elasticity (M OE) of particle boards manufactured with Pinuselliottii and Eucalyptusgrandis species and the addition of waste of Pinuselliottii tree pruning, using a bicomponent polyurethane resin-based castor oil as an adhesive. We prepared nine different experimental conditions, six of the composition of particles of wood (Pinus and Eucalyptus) with pruning residue(30%, 50% and 70% waste) and other three made with 100% of each one of the three types of part icle used, evaluated by the analysis of variance (ANOVA). The panels were prepared by adding 12% of polyurethane resin on the mass particle with a mo isture content of 11%, using compaction pressure of 4.5 MPa and hot pressing of 90 o C. The results showed that the inclusion of pruning residues reduced significantly the strength and stiffness properties of the panels when compared with the materials manufacture dintegrally with Pinusor Eucalyptus particles. The MOR of the materials in all conditions test ed was less than the 18 MPa, limit value set by the Brazilian standard, shown to be necessary to adjust the parameters process used for the achievement of the regulatory requirements.

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