Static Bending Test of Bamboo Scrimber Solid Web Beams and Trusses

Bamboo scrimber has excellent mechanical properties and is a green building material that meets the requirements of sustainable development. In order to further improve the basic theoretical research on bamboo scrimber members, four-point loading static bending tests were carried out on bamboo scrimber solid web beams and trusses to investigate the effects of horizontal and vertical gluing in the direction of the grain on bamboo scrimber solid web beams, and the effects of tongue-and-groove and plywood connections on the mechanical properties of bamboo scrimber trusses. The results showed that the damage of bamboo scrimber solid web beams was caused by cracking of finger joints, and the finger joints were not easy to crack when glued horizontally in the vertical direction of the grain, the tenon joint trusses showed the strength damage mode of lower chord joint cracking, and the plywood joint trusses were out-of-plane instability; the stiffnesses of the two types of solid web beams were basically the same, but the solid web beams glued vertically in the direction of the grain were of higher bearing capacity, and the strength of the materials were more fully utilised; the two types of trusses had basically equal bearing capacity, but the stiffness of tongue-and-groove jointed trusses was higher. Based on the results of the study, it was recommended that the solid web beams showed be glued horizontally in the vertical direction of smooth grain and the truss rods should be connected by tongue-and-groove type in engineering practice.