Browsing by Author "Delgado Lucio, Mario Eduardo"

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    Análisis de las propiedades mecánicas de la madera de ciprés (CUPRESSUS), provenientes de la provincia de Tungurahua y su factibilidad como material estructural de acuerdo a la norma ecuatoriana de la construcción 2015 (NEC 2015)
    (Universidad Técnica de Ambato. Facultad de Ingeniería Civil y Mecánica, Carrera de Ingeniería Civil, 2025-02) Delgado Lucio, Mario Eduardo; Ureña Aguirre, Maritza Elizabeth
    The present experimental study aims to provide precise and detailed data on the mechanical properties of cypress wood, with a focus on its behavior under perpendicular bending to the grain and parallel tensile forces to the grain. The wood samples used in the tests were obtained from three specific locations: the Cárcel and Macasto sawmills in the Ambato canton and a sawmill in the Quero canton, all located in the province of Tungurahua. This approach allowed for an assessment of the influence of the wood's origin on its mechanical properties. To develop the tests, a survey of the sawmills and their respective mechanical properties, such as load capacity, modulus of elasticity, and allowable stress, was conducted as an initial methodological step to identify representative sources of cypress wood in Tungurahua province. The tests were carried out following the guidelines of ASTM A143-94, which establishes procedures for specimen preparation and testing. Five specimens were manufactured for each type of mechanical test, resulting in a total of 30 samples analyzed. Additionally, physical properties, such as moisture content in green and dry states, were evaluated in accordance with the specifications of NTE INEN 896 (2013). This ensured uniform initial conditions of the samples, a critical factor in obtaining reliable results. In the mechanical tests, the modulus of elasticity and allowable stresses were determined using the formulas established in ASTM D198. The results showed that cypress wood exhibits suitable mechanical properties for structural applications, particularly in perpendicular bending to the grain. In this regard, the wood from the Cárcel, Macasto, and Quero sawmills stood out for its remarkable resistance. However, the results for parallel tensile forces were lower than the requirements for demanding structural applications. In conclusion, cypress wood is a viable option for structures subjected to bending stresses, provided its limitations in parallel tension are considered. This highlights the importance of carefully selecting its use based on the demands of the structural design.