RIGIDEZ E RESISTÊNCIA DE VIGAS ESTRUTURAIS DE MADEIRA LAMINADA COLADA E COM PERFIL I COMPOSTAS POR DIFERENTES ADESIVOS BENDING STIFFNESS AND RESISTENCE OF STRUCTURAL GLULAM BEAMS AND I - JOIST COMPOSED OF DIFFERENT ADHESIVES

Wood has always been structurally used in solid form in civil construction, with a low degree of processing and technological innovation, and many times in other constituents such as floors, walls and roofs. However, changes in the adopted standards involve the refinement of technology, as well as, changes of the esthetic and functional concepts required in constructions. Thus, structural wood beams, such as glulam and I – joist, have emerged, presenting a series of advantages such as high resistance in relation to weight. The general objective of this study was to evaluate the effect of the type of adhesive on the strength and stiffness of beams of Glulam and I-joist of Pinus taeda. The adhesives used in the experiment were resorcinol-phenolformaldehyde (RFF), melamine-urea-formaldehyde (MUF) and polyurethane (PUR). The process of 1. Engenheiro Florestal, Dr., Professor do Curso de Engenharia Florestal da Universidade do Contestado e do Centro de Ciencias Agroveterinarias da Universidade do Estado de Santa Catarina, Av. Luiz de Camoes, 2090, Bairro Conta Dinheiro, CEP 88520-000, Lages ( SC). a2abc@cav.udesc.br 2. Engenheiro Florestal, Dr., Professor do Centro de Ciencias Florestais e da Madeira, Setor de Ciencias Agrarias, Universidade Federal do Parana, Av. Lothario Meissner, 632, Jardim Botânico, Campus III, CEP 80210-170, Curitiba (PR). jmatos.ufpr@gmail.com. Recebido para publicacao em 01/10/2007 e aceito em 21/01/2010. CIENCIA FLORESTAL 11-08 193-final.p65 18/8/2010, 16:53 345