ABSTRACT

This paper deals with an innovative experimental study performed on glued-laminated timber (GLT) beams, machined and made with three tropical hardwood species. Defect-free beams were obtained by combining alternatively the lamellas taken from the densest to the least dense species, to have TRIO and DUO specimens. Then, static 3-point bending tests were performed on these beams, to assess their mechanical properties and their reliability. Finally, the shear strength tests of the various glue joints are done to understand the failure mode of the beams observed during the bending tests and their impact on the mechanical behaviour of the GLT beams tested. The results show for the two types of GLT (DUO and TRIO’s beams) studied here that: (i) comparatively to the combinations of two lamellas (DUO’s beams), by taking into account the solid woods and homogeneous beams as references, beams with three lamella combinations (TRIO’s beams) present the best mechanical characteristics; (ii) There is a significant influence of the individual lamella’s position or the type of lamella on the global behaviour of the GLT’s beams. Moreover, the advantages of this type of timber beam material are investigated and shown herein.

摘要

本文涉及对胶合层压木 (GLT) 梁进行的一项创新实验研究，该梁由三种热带硬木树种加工制成。通过交替组合从密度最高的物种到密度最低的物种的薄片，获得 TRIO 和 DUO 样本，从而获得无缺陷光束。然后，对这些梁进行静态 3 点弯曲试验，以评估它们的机械性能和可靠性。最后，对各种胶接接头进行了剪切强度测试，以了解在弯曲测试期间观察到的梁的失效模式及其对测试的 GLT 梁的机械性能的影响。结果表明，对于此处研究的两种类型的 GLT（DUO 和 TRIO 的光束）：(i) 与两个薄片的组合（DUO 的光束）相比，以实木和均质梁为参考，三片组合的梁（TRIO 的梁）呈现出最佳的力学特性；(ii) 单个薄片的位置或薄片类型对 GLT 光束的全局行为有重大影响。此外，本文研究并展示了此类木梁材料的优点。