Experimental and numerical evaluation of the structural performance of Uruguayan Eucalyptus grandis finger-joint
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ORIGINAL
Experimental and numerical evaluation of the structural performance of Uruguayan Eucalyptus grandis finger‑joint Abel Vega1,2 · Vanesa Baño1,3 · Andrea Cardoso4 · Laura Moya5 Received: 27 September 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The aim of this study was to evaluate the structural performance of finger-joints made of Uruguayan Eucalyptus grandis and two types of adhesives. A numerical model for bending strength and stiffness prediction was developed. Model inputs were experimentally determined from tests on wooden specimens and from the literature. Finger-joints glued with two types of adhesives (one-component polyurethane -PUR- and emulsion polymer isocyanate-EPI-) were tested in bending and the failure modes were evaluated. Results show that adhesive type did not influence the stiffness of the finger-joint, but the bending strength. Specimens glued with PUR showed higher strength than those glued with EPI. A 3D model, using Comsol Multiphisic software, was developed to simulate the finger-joint behavior. Adhesive-wood interaction in the finger-joints was modelled using the Comsol Thin Elastic Layer module, defined by the elastic properties of the adhesives. The numerical results showed no differences on the stiffness of the joints regardless of adhesive type. Results agreed with those obtained from experimental tests, with a maximum error of 7%. Models predicted the bending strength with an error of 6% with respect to the experimental values. Different finger configurations were analysed, and the optimal geometry (20 mm-length, 6.2 mm-pitch and 1.0 mm-tip-thick) to attain the maximum strength for Uruguayan Eucalyptus was found.
1 Introduction Glued laminated timber (GLT or glulam) is one of the most important engineered wood products (EWP) used at present in architecture and civil engineering. The manufacturing process is complex and involves many factors, such as species, adhesive type and applied pressure, among others. Optimum parameter combinations, both in glulam and lamella production, must be tailored to meet end-product´s requirements. The efficiency of the longitudinal assembly of laminations through suitable finger-joints is crucial for the
* Vanesa Baño [email protected] 1
Instituto de Estructuras Y Transporte, Facultad de Ingeniería, Universidad de La República, 11300 Montevideo, Uruguay
2
CETEMAS, 33936 Carbayín, Spain
3
CESEFOR, Timber Industry and Construction Area, 42005 Soria, Spain
4
Laboratorio Tecnológico del Uruguay-LATU, 11500 Montevideo, Uruguay
5
Facultad de Arquitectura, Universidad ORT Uruguay, 11300 Montevideo, Uruguay
overall structural performance of GLT and closely related to the manufacturing process. Production requirements for GLT and finger-joint have been well documented, and for softwood species and poplar are established in EN 14080 (CEN 2013). However, there are still several unknowns regarding finger jointing for hardwoods, or for new species/adhesives combinations. The influence of the manufacturi
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