DETERMINACIÓN DE LOS ESFUERZOS DE DISEÑO DE VIGAS LAMINADAS DE PINO CARIBE (Pinus caribaea var. hondurensis) ENCOLADAS CON ADHESIVO DE ISOCIANATO (MDI).

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Title:	DETERMINACIÓN DE LOS ESFUERZOS DE DISEÑO DE VIGAS LAMINADAS DE PINO CARIBE (Pinus caribaea var. hondurensis) ENCOLADAS CON ADHESIVO DE ISOCIANATO (MDI).
Alternate Title:	DETERMINATION OF STRESS PARAMETERS OF GLUED-LAMINATED TIMBER OF CARIBEAN PINE (Pinus caribaea var. hondurensis) GLUED WITH ISOCYANATE-BASED ADHESIVES (MDI).
Authors:	Contreras, Wilver¹ wilconmi@doctor.upv.es, Valero, Styles Will² styles@ula.ve, Thomson, Edward³, Owen, Mary Elena⁴ marowde@ doctor.upv.es, Barrios, Eric⁵ ericbarrios@latinmail.com
Source:	Maderas: Ciencia y Tecnología. 2007, Vol. 9 Issue 3, p285-298. 14p. 2 Color Photographs, 1 Diagram, 5 Charts, 2 Graphs.
Subjects:	Timber, Pine, Strength of materials, Properties of matter, Laminated wood, Adhesives
Abstract (English):	Static flexion tests of eighteen glued-laminated timber of caribean pine glued with isocyanate-based adhesives (MDI) were carried out following ASTM-D198-84 standards at the National Laboratory of Forest Products of "La Universidad de los Andes" (Mérida, Venezuela). These beams were fabricated, in their entirety, by the only company that develops glued-laminated (GLULAM) timber in Venezuela. The glued-laminated timber was divided into two groups of nine. The first group consisted of GLULAM timber made from whole beams of wood, while the second was composed of sectioned wood that had been finger-joined and later made into GLULAM beams. Each group was divided into three subgroups with glued-laminated timber of widths 65mm, 95mm and 125mm, but with a common height of 270mm and a length of 3500mm. The values obtained for stress at proportional limit, modulus of rupture and the modulus of elasticity for all the beams studied were less than those reported for glued-laminated timber from Chilean radiata pine and Argentinean resinous pine. Morphology studies performed on all the studied beams revealed that they presented great deficiencies in the physical quality of the wood, glue lines, and fabrication process. These factors are responsible for the low-performance of the test samples. It is recommended, in this first stage of the industry, that the mentioned technical aspects be improved so that resistance and structural quality of glued-laminated timber is in turn enhanced. [ABSTRACT FROM AUTHOR]
Abstract (Spanish):	A través del Laboratorio Nacional de Productos Forestales de la Universidad de Los Andes (Mérida, Venezuela) se realizaron los ensayos de flexión estática, según la Norma ASTM D-198-84, para la determinación de los esfuerzos de diseño de 18 vigas de madera laminada de pino caribe encoladas con adhesivo de isocianato (MDI). Las mismas fueron fabricadas íntegramente en la única industria de madera laminada existente, hasta el presente, en Venezuela. Estas vigas laminadas se dividieron en dos tipos, 9 estaban constituidas por láminas completas de madera y las otras 9 estaban constituidas por láminas de madera seccionadas y unidas por medio de la técnica del finger joint; dentro de cada uno de estos tipos se prepararon tres vigas laminadas con anchos distintos (65 mm , 95 mm y 125 mm), siendo sus alturas y sus largos iguales (270 mm y 3500 mm respectivamente). Al comparar los resultados obtenidos con valores de vigas laminadas de pino radiata de Chile, y pino resinoso de Argentina se logró determinar, que los valores de Esfuerzo Límite Proporcional, Módulo de Ruptura y Módulo de Elasticidad para todas las vigas estudiadas, estaban por debajo. El análisis morfológico de todas las vigas, definió que éstas presentaron grandes deficiencias en la calidad física de la madera y las líneas de cola, y por igual, en el proceso de fabricación. Estos factores, son la principal causa de los bajos valores obtenidos. Se recomienda, en esta primera etapa de la industria, mejorar los aspectos técnicos señalados, para aumentar la resistencia y calidad estructural de las vigas laminadas encoladas. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

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Abstract:	Static flexion tests of eighteen glued-laminated timber of caribean pine glued with isocyanate-based adhesives (MDI) were carried out following ASTM-D198-84 standards at the National Laboratory of Forest Products of "La Universidad de los Andes" (Mérida, Venezuela). These beams were fabricated, in their entirety, by the only company that develops glued-laminated (GLULAM) timber in Venezuela. The glued-laminated timber was divided into two groups of nine. The first group consisted of GLULAM timber made from whole beams of wood, while the second was composed of sectioned wood that had been finger-joined and later made into GLULAM beams. Each group was divided into three subgroups with glued-laminated timber of widths 65mm, 95mm and 125mm, but with a common height of 270mm and a length of 3500mm. The values obtained for stress at proportional limit, modulus of rupture and the modulus of elasticity for all the beams studied were less than those reported for glued-laminated timber from Chilean radiata pine and Argentinean resinous pine. Morphology studies performed on all the studied beams revealed that they presented great deficiencies in the physical quality of the wood, glue lines, and fabrication process. These factors are responsible for the low-performance of the test samples. It is recommended, in this first stage of the industry, that the mentioned technical aspects be improved so that resistance and structural quality of glued-laminated timber is in turn enhanced. [ABSTRACT FROM AUTHOR]
ISSN:	07173644