Experiment investigation of flexure rigidity of glue laminated timber beams consisting of coconut wood (Cocos nucifera) and sengon wood (Albizia falcatara) based on four-point bending test

This paper was intended to describe the performance of mix-glue laminated timber beams (mix-glulam) compose of coconut wood (Cocos nucifera) and sengon wood (Albizia falcatara) in the outer zone and core zone, respectively. Mix-glulam system is an alternative to utilizing a low-grade timber as structural member of building. Through the analysis of four-point-bending-test results of each of five mix-glulam beams (BLG) and five sengon-solid beams (SDL) with span (L) = 2750 mm, height (d) = 155 mm and width (b) = 55 mm was obtained that the mix-glulam system produces a good performance. The analysis result showed that the flexural rigidity (EI) of BLG is 1.66 times higher than SDL. Likewise, the maximum bending stress (σ_max) of BLG is 1.6 times higher than the σ_max of SDL with tension failure in bending. Generally, the failure of the beam that occurs is a brittle and sudden tension failure.