Ciências Florestais

URI Permanente desta comunidade

http://repositorio.ufes.br/handle/10/17465
Programa de Pós-Graduação em Ciências Florestais

Centro: CCAE
Telefone: (28) 3558 2528
URL do programa: http://www.cienciasflorestais.ufes.br/pos-graduacao/PPGCFL

Navegar

Navegando Ciências Florestais por Autor "2º membro da banca"

Agora exibindo 1 - 1 de 1
  • Nenhuma Miniatura disponível
    Item
    Classificação e análise não destrutiva em vigas de madeira lamelada colada (MLC) de Eucalyptus sp. reforçada com fibras naturais e sintéticas
    (Universidade Federal do Espírito Santo, 2025-06-27) Vicentini, Rogério; Co-orientador1; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador2; https://orcid.org/; http://lattes.cnpq.br/; Orientador1; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; 1º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 2º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 3º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 4º membro da banca; https://orcid.org/; http://lattes.cnpq.br/
    This study was structured in two integrated chapters. The first chapter addressed the classification and non-destructive analysis of lamellae intended for the manufacture of glued laminated timber (Glulam) beams, demonstrating the feasibility of both visual and mechanical classification of lamellae from Eucalyptus sp. clones (17 to 20 years old). The lamellae were prepared and evaluated according to Brazilian Standard ensuring uniformity and control of physical and mechanical properties. Furthermore, a correlation was established between the moduli of elasticity (MOE) obtained by the experimental method and by longitudinal and transverse vibration tests to obtain the MOEs, in order to accurately and quickly compare this type of test, obtaining satisfactory results compared to traditional mechanical tests. In the second chapter, after careful selection of the lamellae by MOE and visual inspection, the glulam beams were bonded using resorcinol-formaldehyde adhesive, resulting in structural elements joined by lamellae with greater strength and rigidity. The experimental design consisted of the production of 28 beams, 7 control beams (without reinforcement) and 21 reinforced beams. The latter were reinforced with natural fibers (sisal and jute) and synthetic fibers (fiberglass), which were glued in the critical tensile regions of the beams. For reinforcement, natural and synthetic fibers were bonded with AR 320 epoxy resin with AH 320 hardener, effective in bonding these materials. The reinforced beams were subjected to four-point bending tests to evaluate the MOE, stiffness, resistance to vertical displacement, and deformation. These tests provided important input for studies and classifications related to the MOE values of each beam tested, a significant property of composite beams. Statistical analysis of the experimental data supported the reliability of the results obtained. The results indicated that the application of sisal, jute, and fiberglass fibers as reinforcement significantly improved the stiffness and MOE of the glulam beams, demonstrating the effectiveness of non-destructive classification and analysis of Glulam beams, suggesting potential improvements to obtain properties in the reinforcement materials and production processes. Additionally, numerical modeling using the finite element method validated the beams' stiffness. The deflection errors found in the modeling reinforce and compare the mechanical test with potential improvements in the process or procedures to improve the production of reinforced beams for high-performance structural timber applications. Thus, this study highlights that rigorous classification of Eucalyptus sp. lamellae according to established standards, combined with appropriate epoxy resin bonding in fiber/resin matrices (natural and synthetic), significantly contributes to increased stiffness. This process, which involves reinforcement, gluing, and pressing, allows for the sustainable expansion of Glulam applications in advanced fiber-reinforced structural systems, demonstrating increased stiffness in structural beams