Existing research has shown that the nail-laminated timber (NLT) floor has the potential to achieve considerable out-of-plane flexural performance at a relatively lower cost. However, though the in-plane performance of structural floors greatly impacts the seismic resistance of the overall structure, research on the in-plane behavior of NLT floors is still insufficient. In this paper, an in-plane shear test was carried out on twelve NLT floor specimens of four subgroups. A finite element model (FEM) method was established and verified using the experimental results. A parametric analysis was performed based on the FEM method to quantify the influence of sheathing nails on the in-plane performance of the NLT floor in both planar directions. Experimental results indicate that sheathing nail spacing and loading direction showed significant influence on the in-plane performance of NLT, while the orientation of sheathing did not. Main failure modes include dislocation of adjacent sheathings, sheathing nail failure, and lamina nail failure. Verification of the proposed FEM method showed good agreement with the experimental results, both on performance characteristics and deformation patterns. Parametric result indicates that the elastic stiffness and shear strength were linearly correlated to the quantity of sheathing nails.

中文翻译：

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钉层压木地板面内性能的实验与数值研究


现有研究表明，钉层压木（NLT）地板有潜力以相对较低的成本实现相当大的平面外弯曲性能。然而，尽管结构楼板的面内性能极大地影响了整体结构的抗震性能，但对NLT楼板面内性能的研究仍然不足。本文对四个亚组的 12 个 NLT 地板试件进行了面内剪切试验。建立了有限元模型（FEM）方法并利用实验结果进行了验证。基于有限元方法进行参数分析，量化护套钉对 NLT 地板两个平面方向面内性能的影响。实验结果表明，护套钉间距和加载方向对NLT的面内性能有显着影响，而护套方向则没有。主要失效模式包括相邻护套错位、护套钉失效和椎板钉失效。对所提出的有限元方法的验证表明，无论是性能特征还是变形模式，都与实验结果非常吻合。参数结果表明，弹性刚度和剪切强度与护套钉的数量呈线性相关。