Static Bending Test of Bamboo Scrimber Solid Web Beams and Trusses
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摘要: 重组竹具有优异的力学性能,是一种满足可持续发展要求的绿色建筑材料。为进一步完善重组竹构件基础理论研究,对重组竹实腹梁和桁架开展四点加载静力弯曲试验,探究顺纹方向水平胶合和竖向胶合方式对重组竹实腹梁、榫口式和夹板式连接方式对重组竹桁架力学行为的影响。结果表明:重组竹实腹梁破坏均由指接位置拉裂引起,垂直顺纹方向水平胶合时指接位置不易拉裂,榫口式连接桁架呈现下弦杆连接处拉裂的强度破坏模式,而夹板式连接桁架为平面外失稳;两种类型的实腹梁刚度基本一致,但顺纹方向竖向胶合的实腹梁的承载力更高,材料强度发挥更充分;两种类型的桁架承载力基本相等,但榫口式连接桁架刚度更高。基于研究结果,建议在工程实践时,实腹梁采用垂直顺纹方向水平胶合,桁架杆件采用榫口式连接。Abstract: 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.
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Key words:
- moso bamboo-based bamboo scrimber /
- solid web beam /
- truss /
- static bending test /
- mechanic performancs
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