Citas bibligráficas
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"
}
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.
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