Finite element analysis of Moso bamboo-reinforced southern pine OSB composite beams

A finite element (FE) analysis was performed to investigate the flexural pr operties of a structural composite lumber-Moso bamboo (Phyllostachys pubesc ens) reinforced southern pine oriented strand-board (OSB). Parametric analy ses were conducted to investigate the stress and displacement distributions . Various beam configurations as affected by glue, web structure, flange co mposition, and bamboo-OSB combination were considered. The comparison of th e numerical results from the selected models with those from bending tests was also performed. Finally, a rational design criterion for this type of c omposite beam was proposed based on the analytical and experimental studies . Bamboo is capable of improving the flexural properties of the OSB for use as a structural beam or joist. At a given cross section of about 30 X 140 mm, for instance, two-layer (6.4-mm thickness each) laminated bamboo flange can increase the OSB beam's maximum bending stress by 60 to 70% and double its stiffness. The total flange thickness, rather than the thickness of ea ch layer, controls the beam deflection while the flange with a thinner laye r (3.2 mm) resulted in higher bending, vertical, and transverse stresses bu t lower in-plane shear stress. More reinforcing material in the composite b eam could reduce the maximum bending stress but would likely increase beam weight and processing cost. From this study, it is suggested that a two-lay er flanged composite beam would be favorable from a material processing sta ndpoint as well as superior in engineering performance over other configura tions of bamboo-OSB composite beam product.