The Bending Behavior of Glulam Wood Beams Made of Rubberwood and Plywood

Abstract

This research is to study of load and deformation behavior of glulam wood beams made of rubberwood reinforced with a plywood. The rubberwood lumber size 5×2×50 cm, assemble with glue and reinforcing with plywood size 5×1×150 cm in the middle of section. Two forms of glulam wood beams were investigated experimentally comprising of stacking vertical form (1) and stacking horizontal form (2). The total by all patterns had the equally width of 5 cm, the thickness of beam had 4, 5, 8, 9 and 10 cm and length of 150 cm. Two methods of bonding wood beam consists of the glue only and the glue combined with nail. To take for study on bending behavior of glulam beam by using 3 point bending testing and using support length of 100 cm (ASTM D143). The deflection of beam equal to allowable deflection at L/360 or 0.277 cm. The result, It was found that the ultimate load acting on glulam wood beam reinforced with plywood were higher than that of glulam wood beam without reinforcement. The glulam beam fabricate with glue only had high bending strength more than Glulam beam fabricate with glue combined with nail. Because very soft wood properties of rubberwood had affect to low shearing strength for nail and cause for low bending strength of glulam beam fabricate with glue and nail.