Floresta e Ambiente
https://floram.org/article/588e21fee710ab87018b45dc
Floresta e Ambiente
Original Article

COMPORTAMENTO DE VIGAS RETAS EM MLC COM EMENDAS DE TOPO E BISEL – PARTE I

BEHAVIOUR OF STRAIGHT GLULAM BEAM WITH SCARF AND BUTT JOINT- PART I

Nascimento, Alexandre Miguel do; Lucia, Ricardo Marius D.; Baeta, Fernando da Costa

Downloads: 0
Views: 283

Resumo

Foram construídas e testadas oito vigas com madeira de pinus, divididas em dois grupos sendo o primeiro grupo com emendas em bisel em todas as laminas e o segundo com bisel nas laminas tracionadas, e topo nas laminas comprimidas. A colagem das emendas foi feita simultaneamente à colagem das vigas, dispensando pré-colagem das emendas. As vigas foram avaliadas quanto ao módulo de ruptura e as fraturas ocorridas. As médias dos módulos de ruptura do primeiro e segundo grupos foram, respectivamente, 53,0 MPa e 55,6 MPa. O contraste entre esta médias, que pelo teste t, não mostrou diferença significativa, o que revela que as emendas de topo na região comprimida são tão eficientes quanto as emendas biseladas. A diferença média entre o módulo de elasticidade experimental e teórico foi de 4,43%. Das 8 vigas testadas 4 apresentaram ruptura na emenda da lamina mais solicitada à tração. Isto sugere que nas laminas mais solicitadas à tração, a colagem das emendas possa ser feito em separado.

Palavras-chave

mlc, pinus, emendas

Abstract

Eight long glulam beams were manufactured using pine lumber. Four of them were used scarf joints in the plies, while the rest had scarf joints in the tension side and but joints in the compression plies. The joints were glued simultaneously with the gluing of the plies, thus eliminating a previous adhesion. The beams were loaded to rupture and described as to their modulus of rupture and type of fracture. Beam strength averaged 53.0 and 55.6 MPa for the first and second group, respectively. The difference between these two values was not significant, statistically, and indicates that butt joints in the compression side are as efficient as scarf joints. The difference between the experimental and the theoretical modulus of elasticity was only 4.43%. Of the eight beams tested, four failed in the joint most stressed in tension. This indicates that those joints should be made in a previous operation.

Keywords

glulam, pine, joints
588e21fee710ab87018b45dc floram Articles
Links & Downloads

FLORAM

Share this page
Page Sections