With the expansion of cross-laminated timber (CLT) material throughout the global construction community, an effort is being made to explore the use of regionally produced CLT materials from Iran, including the testing of fast-grown, hand-planted poplar (Populus alba). This paper investigated the out-of-plane bending properties of CLT panels manufactured using poplar at various span-to-depth ratios (SDR). Mechanical properties of poplar CLTs investigated included the modulus of rupture, apparent modulus of elasticity, effective bending stiffness, effective shear stiffness, and maximum shear stress in both the major and minor directions. Experimental test results were compared with both the shear analogy model and finite element method (FEM) results to examine the use of predictive modeling. Bending properties were predicted using the shear analogy method and FEM compared well with experimental results, with the FEM able to predict the distribution of bending and shear stress across the beam thickness. Modulus of rupture and apparent modulus of elasticity increased with increasing SDR in both the major and minor strength directions. In the major strength direction, the effective modulus of elasticity and maximum shear strength values predicted by the shear analogy method were in good agreement with experimental results. As noted in previous studies, the effective shear stiffness predicted by the shear analogy method in the major strength direction was 510% less than that of experimental results.

随着交叉层压木材（CLT）材料在全球建筑界的扩展，正在努力探索使用伊朗生产的本地CLT材料的方法，包括对速生手工种植杨树（Populus alba）的测试。）。本文研究了使用杨木制造的CLT面板在各种跨度-深度比（SDR）下的平面外弯曲特性。研究的杨树CLT的力学性能包括断裂模量，表观弹性模量，有效弯曲刚度，有效剪切刚度以及主，次方向上的最大剪切应力。将实验测试结果与剪切类比模型和有限元方法（FEM）结果进行了比较，以检验预测模型的使用。使用剪切类比法预测了弯曲性能，并将有限元与实验结果进行了比较，有限元能够预测梁厚度上弯曲和剪切应力的分布。断裂模量和表观弹性模量在主要和次要强度方向上均随着SDR的增加而增加。在主强度方向上，通过剪切类比法预测的有效弹性模量和最大剪切强度值与实验结果吻合良好。如先前的研究所述，通过剪切类比法预测的在主要强度方向上的有效剪切刚度比实验结果要低510％。