接头形状、位置和数量对层压竹材弯曲性能的影响
摘 要
大跨度建筑材料大型竹层压材（LBL）是由竹条接头延而制的。本次研究探索了三层LBL延长竹条的三种接头形式，以及接头数量和位置对LBL弯曲性能的影响。将采用热处理（120C°）的含接头毛竹，与不含接头的对照比较，制备了复合材料。研究表明，三种接头形式的LBL弯曲强度降低率均超过10%。然而，钩接因更简单、更有效的加工和胶合工艺成为延长竹条最有潜力的选择。在优化接头形状的基础上，当钩形接头位于试样长度的1/4处时，强度折减率最小（1.43%）。当接头数量从1增加到3时，弯曲强度降低了6.82-31.11%。结果表明，节点参数对LBL的强度有很大影响，控制连接点的数量和位置非常重要。
关键词：竹子复合材料、层压板、装配、强度、接头大跨度建筑材料
Effects of shape, location and quantity of the joint on bending properties of laminated bamboo lumber
ABSTRACT
The large-span building material, large-scale bamboo laminated material (LBL), is made from the joint of bamboo strips. In this study, three kinds of joint forms of three-layer LBL extended bamboo strip and the effect of joint number and position on the bending performance of LBL were explored. The composite material was prepared by comparing the bamboo with joint and the bamboo without joint. The results show that the reduction rate of LBL bending strength of three kinds of joints is more than 10%. However, because of the simpler and more effective processing and gluing process, the hook joint has become the most potential choice to extend the bamboo strips. On the basis of optimizing the joint shape, when the hook joint is located at 1 / 4 of the sample length, the strength reduction rate is the smallest (1.43%). When the number of joints increased from 1 to 3, the bending strength decreased by 6.82-31.11%. The results show that the node parameters have a great influence on the strength of LBL, and it is very important to control the number and location of the connection points.
Key words：Bamboo composite, laminate, assembly, strength, joint long-span building materials
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