Publicaciones de proyectos
Permanent URI for this collection
Publicaciones vinculadas a proyectos con financiamiento externo.
Recent Submissions
- ItemExperimental investigation on dowel laminated timber made of Uruguayan fast-grown species(Norwegian University of Life Sciences (NMBU), 2023) Bruzzone, Gastón; Quagliotti, Sebastián; Arrejuría, Stephany; Godoy, Daniel; Böthig, Silvia; Moya, LauraThis paper presents the experimental results on Dowel Laminated Timber (DLT) made of Uruguayan fast-growing Pinus elliottii and Eucalyptus grandis, fastened with hardwood dowels. Four series, each comprising six structural-size panels made of different combinations of lamella species and dowel diameters were constructed and tested in 4-point bending. The strength and stiffness of panels made of eucalyptus lamellae were superior to those of pine, regardless of dowel species or dowel diameter. These results are consistent with the superior density and stiffness values found for eucalyptus lamellae (475 kg/m3, 10,57 kN/mm2) compared to the respective values for pine (399 kg/m3, 5,37 kN/mm2) previously determined by NDT (non-destructive testing). Moreover, the bending strength of pine DLT were significantly higher (19,82 and 16,84 kN/mm2) than the strength of the lowest grade of sawn pine timber (11,01kN/mm2) established in the Uruguayan Standard UNIT 1261. Species of dowels, evaluated on pine DLT, did affect the strength but not the stiffness of the panels. Diameter of dowels, analysed on eucalyptus DLT, showed no influence on the mechanical properties of the panels. Failure type observed in tested specimens suggests that joint between lamellae and dowels performed correctly
- ItemStructural behavior of timber-to-timber connections made of fast-growth pine and hardwood dowels(Norwegian University of Life Sciences (NMBU), 2023) Moya, Laura; Godoy, Daniel; Passarella, Diego; Bruzzone, Gastón; Casaravilla, Jorge; Quagliotti, SebastiánWooden dowels are being considered as an alternative to metallic fasteners, and to adhesives for laminated timber products such as dowel laminated timber (DLT). Knowledge of the mechanical behaviour of timber-to-timber connections is crucial to design and predict the overall DLT performance. In this paper the moment capacity of 20 mm diameter dowels from two hardwood species was first assessed, followed by the estimation of the shear capacity and slip modulus of connections made of fast-growing pine wood and hardwood dowels. Results from shear tests were used as input for an analytical model to predict the load bearing capacity of the connections subjected to bending. Four-point bending tests on specimens made of three timber boards fastened with dowels were performed and used to validate the model.
- ItemCaracterización de tarugos para producción de placas de madera laminada uruguaya(Universidad Tecnológica Nacional (INTA), 2021) Bruzzone, Gastón; Passarella, Diego; Quagliotti, Sebastián; Moya, LauraLa madera laminada tarugada (DLT) es un producto de ingeniería de madera para uso en arquitectura que consiste en tablas de madera aserrada unidas por tarugos de madera. El diseño de paneles y placas requiere conocer las propiedades de los materiales constituyentes: tablas y tarugos y el comportamiento de las uniones madera-madera. Este trabajo focalizó en la caracterización mecánica de tarugos con potencial para ser utilizados en placas DLT fabricados con madera de procedencia uruguaya. Para ello fueron preparadas y ensayadas seis series de tarugos, combinando especies y diámetros, de maderas de Eucalyptus grandis, Eucalyptus tereticornis y Balfourodendron riedelianum. Los ensayos de caracterización incluyeron flexión en 3 puntos, densidad y contenido de humedad. Los resultados mostraron que la madera de B. riedelianum presentó la mejor relación resistencia-densidad, seguido por la madera de E. tereticornis y luego la de E. grandis. La escasa disponibilidad de madera de B. riedelianum en el mercado uruguayo, limita su uso para DLT. Sin embargo, la disponibilidad de madera de Eucalyptus y los resultados promisorios de este trabajo permiten visualizar el potencial de E. grandis y E. tereticornis para DLT.
- ItemFeasibility of using Uruguayan Eucalyptus for sustainable timber connections(Agronomy College (FAgro), Universidad de la República (Udelar), 2023) Passarella, Diego; Bruzzone, Gastón; Quagliotti, Sebastián; Moya, LauraUruguayan fast-growing Eucalyptus grandis has emerged as a promising sustainable material for structural building components. However, traditional methods for joining timber components, such as beams and columns, typically rely on metallic fasteners, and mass timber products like glued laminated timber often use adhesives. In response to growing environmental concerns over the past five years, researchers have explored the substitution of petroleum-based adhesives and metallic fasteners with wooden pegs or dowels. To create effective connections, these dowels must be fashioned from denser wood than the lamellae. The embedment strength of both woods with varying densities is a critical factor in the design of timber connections using fasteners. This paper presents the results of a structural performance analysis of fully eucalyptus dowelled connections, constructed by combining Eucalyptus grandis (? = 473.2 kg|m3, COV = 13.2 %) for the lamellae and Eucalyptus tereticornis (? = 1042.4 kg|m^3, COV = 3.2 %) for the dowel. The bending strength of dowels was determined for specimens with 15- and 18-mm diameters, yielding 173.0 MPa (COV = 10.7 %) and 184.0 MPa (COV = 8.3 %), respectively. Four series of connections were tested, varying the fiber orientation of the lamellae (longitudinal L, transversal T) and dowel diameter (15, 18), following the half-hole method described in ASTM D 5764 standard. The embedment strength values obtained for the connections are as follows: L-15 = 31.3 MPa (COV = 9.3 %), T-15 = 11.2 MPa (COV = 28.7 %), L-18 = 29.6 MPa (COV = 10.1 %), T-18 = 16.7 MPa (COV = 25.7 %). These results reveal that the longitudinal application of the load, aligned with the fiber orientation, exhibits approximately twice the strength of the transversal orientation, with less variability in the outcomes. Furthermore, a strong correlation with the lamellae density was observed, while no significant dependency on the dowel diameter was found. These findings represent a crucial initial step in characterizing and designing glue-free wood-wood connections. The utilization of different eucalyptus species presents a promising path for the development of connections that promote more sustainable timber construction systems.