Avaliação de vigas de madeira laminada colada de cedrinho (Erisma uncinatum Warm.)

CERNE

Zangiácomo, André Luiz³  Segundinho, Pedro Gutemberg de Alcântara²  Carreira, Marcelo Rodrigo⁴  Dias, Antonio Alves¹  Lahr, Francisco Antonio Rocco¹ 

[1] Universidade de São Paulo, São Carlos, Brasil$$;Universidade Federal do Espírito Santo, Jerônimo Monteiro, Brasil$$;Universidade Federal de Lavras, Lavras, Brasil$$;Universidade Tecnológica Federal do Paraná, Campo Mourão, Brasil$$

关键词: Transverse vibration;    glulam beams;    tropical timber;    nondestructive testing.;   

DOI  :  10.1590/S0104-77602013000300011

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

Glued laminated timber (glulam) is assembled layers of  bonded pieces of timber. In Brazil, the use of native species timber to produce structural elements of glulam does not occur in satisfactory technological conditions. This is because the properties and performance of native species of wood, under various service conditions, are not entirely known. This study aims at determining and to relate the dynamic modulus of elasticity (E_Mvt ) and the static modulus of elasticity (E_M ), the modulus of rupture (f_M ), the compression parallel strength (σ_cp ) and the parallel elastic modulus (E_cp ), and evaluating the performance of the native species Cedrinho (Erisma uncinatum Warm.) in the construction of glulam beams. Glulam beams were produced with random and nonrandom distributions of graded pieces of bonded lumber by using adhesives of phenol resorcinol formaldehyde (RFF) and polyurethane (PUR); the intensity of pressures used was  0.8 MPa and 1.2 MPa. The evaluation of these glulam beams was also performed using samples of compression parallel to glue lines and delamination. It was found that the E_Mvt obtained by transverse vibration dynamic testing revealed a correlation coefficient with the E_M obtained on static bending test (R² = 0.86) and significance level of 1% probability (P < 0,01). Thus, it can observed that the E_Mvt is a good estimator of E_M. It was found that this wood species may be used for glulam, and that the hardwoods species is in strength class C30.

【 授权许可】

Unknown