62 documents found, page 1 of 7
Evaluation of moisture content variation on strength and stiffness properties o...
Aquino,Vinicius Borges de Moura; Soares,Larissa Soriani Zanini Ribeiro; Ruthes,Heloiza Candeia; Arroyo,Felipe Nascimento; Fraga,Iuri FazolinAbstract In order to evaluate the influence of moisture content on wood physical and mechanical properties, the present research analyzed the influence of moisture content variation on Cedrella sp. on 12 strength and stiffness properties, considering 12% moisture content up to Fiber Saturation Point (FSP) were considered. Brazilian Standard consider a correction on wood properties obtained on moisture content d...
Physico-Chemical Characterization of Tropical Wood Species for Use and Producti...
Guedes,Ulysses Harley; Nascimento,Maria Fátima do; Silva,Diogo Aparecido Lopes; Christoforo,André Luis; Lahr,Francisco Antonio RoccoAbstract The objective of this research is to evaluate the possibility of use of tropical hardwood species (Amburana cearensis and Cedrella fissilis) for grilling plank production. Physical, chemical and organoleptic properties were evaluated and compared with properties of a well-used wood specie for grilling plank across Europe and USA, Western Red Cedar (Thuja plicata). For chemical analysis, three technique...
Análise da representatividade e da densidade aparente como estimadoras do módul...
Lahr,Francisco Antonio Rocco; Chahud,Eduardo; Arroyo,Felipe Nascimento; Christoforo,André Luis; Rodrigues,Edson Fernando CastanheiraResumo Para o dimensionamento correto de estruturas de madeira, as premissas da norma brasileira são de extrema valia como norte para os engenheiros estruturais, pois exibem valores padrão de resistência. Dessa forma, este estudo tem como objetivo analisar se o valor do módulo de elasticidade da classe C60 exibido na norma brasileira confere com os valores obtidos em ensaio de 23 espécies brasileiras, utilizand...
Production of mahogany particleboards using branches and wood residues
Silva,Vitor Uemura da; Aquino,Vinicius Borges de Moura; Ruthes,Heloiza Candeia; Christoforo,André Luis; Lahr,Francisco Antonio RoccoAbstract Mahogany (Swietenia macrophylla King) is one of the most valuable wood species found in the American Continent. This study is an evaluation of the production of particleboards using wood residues from the branches and trunk of a mahogany tree. It was designed to test the feasibility of production and the mechanical and physical characteristics of the finished particleboards, as well as to compare the r...
Effect of CCB Treatment and Alternative Adhesive Content on Physical and Mechan...
Shirosaki,Rodrigo Kiyoshi; Aquino,Vinicius Borges de Moura; Wolenski,Anderson Renato Vobornik; Panzera,Tulio Hallak; Silva,Diogo Aparecido LopesAbstract The present study aimed to characterize medium density particleboard manufactured with CCB treated particles of Pinus sp. wood specie and alternative mixed vegetal oil-base bicomponent polyurethane resin. For this, three different resin concentrations (10 %, 12 % and 15 %) were used in combination with the presence or absence of the CCB preservative, resulting in six distinct treatments. The particlebo...
Influence of Moisture on Physical and Mechanical Properties of Pouteria Pachyca...
Arroyo,Felipe Nascimento; Fraga,Iuri Fazolin; Soares,Larissa Soriani Zanini Ribeiro; Aquino,Vinicius Borges de Moura; Ruthes,Heloiza CandeiaAbstract According to the Brazilian standard for wooden structures, strength and stiffness increase linearly with decreasing moisture; however, as wood is a natural, heterogeneous and anisotropic material, certain strength and stiffness properties may not be affected even by large differences in moisture. Therefore, this work aims to evaluate the reliability of the resistance and rigidity transformation equatio...
INFLUENCE OF MOISTURE CONTENT ON PHYSICAL AND MECHANICAL PROPERTIES OF Vatairea...
Ruthes,Heloiza Candeia; Mascarenhas,Fernando Júnior Resende; Soares,Larissa Soriani Zanini Ribeiro; Aquino,Vinícius Borges de MouraABSTRACT The recent interest in constructing high and robust wooden structures has stimulated the investigation of physical and mechanical properties as well as their correlation with other important parameters of the material of tropical species like the Vatairea sp., whose popular name is angelim-amargoso, used especially in roof structures with large spans. The Brazilian Standard for wood constructions recom...
INFLUENCE OF THE TIMBER ELASTIC MODULUS ON THE GEOMETRIC NONLINEAR STRUCTURAL A...
Silva,Thiago Damasceno; Christoforo,André Luis; Panzera,Tulio Hallak; Molina,Julio Cesar; Lahr,Francisco Antonio RoccoABSTRACT In this work, it was numerically evaluated the influence of the modulus of elasticity parallel to the wood grain on the stability of trussed arches considering a nonlinear geometric analysis based on the Finite Element Method (FEM). This approach was carried out according to a positional formulation of the FEM, considering the structural nodes as main variables of the nonlinear equations system, whose ...
NUMERICAL ANALYSIS OF HARDWOOD TIMBER BEAMS REINFORCED WITH STEEL PLATE SCREWED
Jardim,Pedro Ignácio Lima Gadêlha; Mascarenhas,Fernando Júnior Resende; Almeida,Diego Henrique de; Lahr,Francisco Antonio Rocco; Christoforo,André LuisABSTRACT There are several technologies to recover and strengthen timber structures. Two usual alternatives are: the use of steel plates screwed and carbon fiber mats glued with epoxy adhesive. A gap was observed in the literature regarding the study of reinforcement in hardwood timber beams with cross-section loss, commonly found in attacks by biotic or abiotic agents. This study aimed to analyze the flexural ...
Estimativa da resistência e da rigidez à compressão paralela às fibras da madei...
Marini,Lucas José; Almeida,Tiago Hendrigo; Almeida,Diego Henrique; Christoforo,André Luis; Lahr,Francisco Antonio RoccoResumo Propriedades de resistência e de rigidez da madeira, fundamentais em um projeto estrutural, são determinadas com base em ensaios mecânicos. Entre as propriedades mecânicas da madeira, destacam-se as de resistência (fc0) e de rigidez (Ec0) à compressão na direção paralela às fibras. A cor é uma característica própria de cada espécie. Se determinadas experimentalmente as propriedades fc0 e Ec0 de uma espéc...