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%的平面加载层芯材料的三面添加45度交叉贴面层作为外增强层，其弯矩承载力显著增强，在平面和边缘加载条件下均是未增强芯材料的两倍，性能略优于实木。这些初步发现有望引入增强的弯曲层压元件，能够在两个线性截面之间充分均匀地无缝传递载荷，并接近结构合理、仅限木材、抗弯矩的结构应用的预期目标。然而，该应用程序的连续包装方法在技术上具有挑战性，特别是在曲面上；因此，具有相同预期性能的包裹弯曲单板的更简单的应用已经开发出来。针对加固层的胶粘剂类型、厚度、包覆角度、材料等参数，制作了专门开发的抗剪/抗拉试验夹具，实现了最优组合。夹具改编自Arcan等人的剪切夹具；范围从纯剪切到纯张力在15度增量和可变厚度，并将促进所需性能的分析参数化设计。

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.