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Calsina, Y., (2021). Resistencia a doble cizallamiento en uniones clavadas de la especie forestal Pashaco (Albizzia sp.) [Tesis, Universidad Nacional de Ingeniería]. http://hdl.handle.net/20.500.14076/22363
Calsina, Y., Resistencia a doble cizallamiento en uniones clavadas de la especie forestal Pashaco (Albizzia sp.) [Tesis]. PE: Universidad Nacional de Ingeniería; 2021. http://hdl.handle.net/20.500.14076/22363
@misc{renati/267463,
title = "Resistencia a doble cizallamiento en uniones clavadas de la especie forestal Pashaco (Albizzia sp.)",
author = "Calsina Sánchez, Yonathan Abad",
publisher = "Universidad Nacional de Ingeniería",
year = "2021"
}
Title: Resistencia a doble cizallamiento en uniones clavadas de la especie forestal Pashaco (Albizzia sp.)
Authors(s): Calsina Sánchez, Yonathan Abad
Advisor(s): Moromi Nakata, Isabel
Keywords: Construcciones de madera; Análisis estructural (Ingeniería); Madera; Pashaco (Albizzia sp.)
OCDE field: http://purl.org/pe-repo/ocde/ford#2.01.01
Issue Date: 2021
Institution: Universidad Nacional de Ingeniería
Abstract: La presente Tesis se desarrolló con la finalidad determinar la resistencia a doble cizallamiento de uniones clavadas de la especie forestal Pashaco (Albizzia sp.), la especie maderable Pachaco tiene como nombre científico Albizzia sp y corresponde a la familia Fabaceae. Para determinar la resistencia a doble cizallamiento de las uniones clavadas, se elaboraron probetas, donde se utilizó clavos de uso comercial como son: clavos de 2” y 2.76mm de diámetro; clavos de 2 ½ ” y 3.38mm de diámetro; así como también clavos de 3” y 3.78mm de diámetro. Se fabricó 120 probetas, elaboradas en 3 grupos, resultando 40 probetas por cada clavo diferente. En cada tipo probeta se hinco 4 clavos en dirección perpendicular tanto a las fibras de la madera, así como a la dirección de la aplicación de la carga, El espesor total de la probeta fue igual a la longitud total del clavo, generalmente en construcción se usa madera seca y son en estas condiciones donde las piezas de madera admiten mayores solicitaciones de carga, razón por la cual la condición en las que se ensayó las uniones clavadas en madera Pashaco fueron en estado
seco.
Siguiendo los lineamientos de la norma ASTM D1761 se desarrolló los ensayos experimentales en las uniones clavadas donde se aplicó una carga que se reparte en dos planos de corte “doble cizallamiento” y dividiendo entre dos se obtuvo los valores de resistencia a simple cizallamiento. En la búsqueda de los esfuerzos admisibles se considera dos formas de cálculo, para cada ensayo se determinaron las cargas correspondientes a 0.38mm de deformación y para cargas últimas que se observan en el comportamiento de la curva Carga vs deformación de las Uniones clavadas. Además, se usó los factores de reducción recomendados por el Manual de diseño de maderas formulado por el grupo andino que es la base de nuestro reglamento de maderas E.010
Los resultados experimentales de las uniones clavadas en la especie maderable Pashaco en promedio representan el 84% de los valores de la Norma E.010 del RNE. Además, estos resultados experimentales se compararon con los resultados de cálculo teórico propuestos por reglamentos de diseño como la (JUNAC) en nuestro País, la norma europea (EUROCÓDIGO 5), la norma argentina (CIRSOC 601), la norma brasileña (NBR 7190) y la americana (USDA) donde este último es un modelo tradicional que tiene mayor afinidad con la propuesta de la JUNAC.
Como resultado de la comparación, los Valores de diseño admisibles de las tres uniones clavadas para cada reglamento en promedio representan el 99% para el EUROCÓDIGO 5, el 96% para la USDA, el 84% para la JUNAC, el 70 % para la CIRSOC 601 y el 69% para la NBR7190 respecto a los valores admisibles experimentales del Laboratorio.
This thesis was developed with the purpose of determining the resistance to double shear of nailed joints of the forest species Pashaco (Albizzia sp.). The timber species Pachaco has the scientific name Albizzia sp and corresponds to the Fabaceae family. To determine the double shear resistance of the nailed joints, test pieces were made, where commercial nails were used, such as: 2” and 2,76 mm diameter nails; 2 ½ ” 3,38 mm diameter nails; as well as 3” and 3,78 mm diameter nails. 120 test pieces were manufactured, elaborated in 3 groups, resulting in 40 test pieces for each different nail. In each type of test piece, 4 nails were driven in a perpendicular direction both to the wood fibers as well as to the direction of the application of the load. The total thickness of the specimen was equal to the total length of the nail. Generally, in construction, dry wood is used, and in these conditions, it is where the pieces of wood admit greater load requirements. For this reason, the condition in which the joints nailed in Pashaco wood was in a dry state. Following the guidelines of the ASTM D1761 standard, the experimental tests were developed in the nailed joints where a load that is distributed in two "double shear" cutting planes was applied, and dividing by two, the values of resistance to simple shear were obtained. In the search for the admissible stresses, two forms of calculation are considered. For each test, the loads corresponding to 0,38 mm of deformation and for ultimate loads that are observed in the behavior of the Load vs deformation curve of the nailed joints were determined. In addition, the reduction factors recommended by the Wood Design Manual, formulated by the Andean group that is the basis of our E.010 wood regulation, were used. The experimental results of the nailed joints in the Pashaco timber species, on average, represent 85 % of the values of Standard E.010 of the RNE. In addition, these experimental results were compared with the theoretical calculation results proposed by design regulations such as (JUNAC) in our country, the European standard (EUROCODE 5), the Argentine standard (CIRSOC 601), the Brazilian standard (NBR 7190) and the American (USDA) where the latter is a traditional model that has a greater affinity with the JUNAC proposal. Because of the comparison, the Allowable Design Values of the three nailed joints for each regulation on average represent 99 % for EUROCODE 5, 96 % for USDA, 84 % for JUNAC, 70 % for CIRSOC 601 and 69 % for NBR7190 with respect to the laboratory's experimental admissible values.
This thesis was developed with the purpose of determining the resistance to double shear of nailed joints of the forest species Pashaco (Albizzia sp.). The timber species Pachaco has the scientific name Albizzia sp and corresponds to the Fabaceae family. To determine the double shear resistance of the nailed joints, test pieces were made, where commercial nails were used, such as: 2” and 2,76 mm diameter nails; 2 ½ ” 3,38 mm diameter nails; as well as 3” and 3,78 mm diameter nails. 120 test pieces were manufactured, elaborated in 3 groups, resulting in 40 test pieces for each different nail. In each type of test piece, 4 nails were driven in a perpendicular direction both to the wood fibers as well as to the direction of the application of the load. The total thickness of the specimen was equal to the total length of the nail. Generally, in construction, dry wood is used, and in these conditions, it is where the pieces of wood admit greater load requirements. For this reason, the condition in which the joints nailed in Pashaco wood was in a dry state. Following the guidelines of the ASTM D1761 standard, the experimental tests were developed in the nailed joints where a load that is distributed in two "double shear" cutting planes was applied, and dividing by two, the values of resistance to simple shear were obtained. In the search for the admissible stresses, two forms of calculation are considered. For each test, the loads corresponding to 0,38 mm of deformation and for ultimate loads that are observed in the behavior of the Load vs deformation curve of the nailed joints were determined. In addition, the reduction factors recommended by the Wood Design Manual, formulated by the Andean group that is the basis of our E.010 wood regulation, were used. The experimental results of the nailed joints in the Pashaco timber species, on average, represent 85 % of the values of Standard E.010 of the RNE. In addition, these experimental results were compared with the theoretical calculation results proposed by design regulations such as (JUNAC) in our country, the European standard (EUROCODE 5), the Argentine standard (CIRSOC 601), the Brazilian standard (NBR 7190) and the American (USDA) where the latter is a traditional model that has a greater affinity with the JUNAC proposal. Because of the comparison, the Allowable Design Values of the three nailed joints for each regulation on average represent 99 % for EUROCODE 5, 96 % for USDA, 84 % for JUNAC, 70 % for CIRSOC 601 and 69 % for NBR7190 with respect to the laboratory's experimental admissible values.
Link to repository: http://hdl.handle.net/20.500.14076/22363
Discipline: Ingeniería Civil
Grade or title grantor: Universidad Nacional de Ingeniería. Facultad de Ingeniería Civil
Grade or title: Ingeniero Civil
Juror: Piqué Del Pozo, Javier Román; Masías Guillén, José Cipriano
Register date: 11-Jul-2022
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