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.
Key words:
glulam; pine; joints
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