Sidewall Thickening as Strengthening for Box-Section Laminated Bamboo Beam under Transverse Load in Shear Failure Mode

摘要

This study aimed to compare the mechanical properties of the box-section beams made from laminated bamboo by strengthening the sidewall thickening. The base of this research was that the box-section beam had a higher bending strength than the solid cross-section with the same material volume but lack of shear strength due to the reduced sidewall thickening. A way to increase the shear strength of the box-section beam was to thicken the sidewall on the areas that receive the maximum shear force that was one-third of the span from both supports. In this research, the sidewall thickness variations in the maximum shear force areas were 2 cm (unreinforced group), 3 cm, 4 cm and 4.8 cm. The results of this research were; first, there was a significant increase in the shear strength of the box-section beam reinforced by the sidewall thickening compared to the unreinforced ones. Second, there was no significant difference in the modulus of elasticity of the box-section beams in all samples. Third, the average serviceability load of the box-section beams was 39.11% of the maximum load. And fourth, the sidewall thickening on one-third of the support span saved the material used compared to the thickening on the entire support span.