Wrapping LVL as a wood-only timber frame joint inspired by the model of trees' stem-branch junction

在厚度为总深度8%的平面加载层合核心材料的三个侧面添加45度交叉层合板作为外加强层进行的简化试验表明，弯矩承载力显著提高，在平面加载和边缘加载条件下，未加筋核心材料的性能提高一倍，略高于实木的性能。这些初步发现有望引入能够在两个线性截面之间充分、均匀地无缝传递荷载的增强型弯曲层合单元，并接近于结构健康的、仅用于木材的、抗弯的木材节点构造应用的目标。然而，所述应用的预定连续缠绕方法被证明在技术上具有挑战性，特别是在曲面上；因此，具有相同预定性能的缠绕弯曲贴面的应用被开发得简单得多。此外，根据粘结剂的种类、厚度、包角和加筋层的材料等参数，制作了专门研制的剪切/拉伸测试夹具，以实现最佳组合。该固定器改编自Arcan等人的作品。剪切夹具；范围从纯剪切到纯拉伸，以15度增量和不同的厚度，并将促进所需性能的分析性参数设计。

The performed simplified experiments of adding 45 degrees cross-laminated veneer layers as outer reinforcements to three sides of the flat-wise loaded laminated-core material with a thickness of 8% of the total depth, showed the significant enhancement in moment capacity, doubling the performance of the unreinforced core material in flat-wise and edge-wise loading conditions and slightly surpassing the performance of solid wood.These initial findings promise to introduce enhanced bent-laminated elements capable of seamlessly transferring loads between two linear sections adequately and homogeneously and approaching the intended aim of a structurally sound, wood- only, moment-resistant constructional application at timber joints. However, the intended continuous wrapping approach of the addressed application proved to be technically challenging, specifically on curved surfaces; hence, much simpler applications of wrapped bent veneers with the same intended performance have been developed. Furthermore, regarding the parameters of adhesive type, thickness, wrapping angle, and material of the reinforcement layers, a specially developed shear/tension testing jig was manufactured to achieve the optimal combination. The fixture was adapted from the Arcan et al. shear fixture; ranging from pure shear to pure tension in 15 degrees increments and at variable thicknesses, and will facilitate the analytical parametric design of the desired performance.