ABSTRACT

The literature is replete with studies conducted on wood-based boards. However, studies involving the influence of orthotropy and shear deformation on the one-dimensional buckling behaviour of oriented strand boards are lacking. This study is a step-by-step approach towards investigating and discussing the influence of orthotropy and shear deformation on the bending and one-dimensional buckling behaviour of oriented strand boards using specimens which are 12, 18, and 25 mm in thickness, measuring 400 and 780 mm in length for the bending analyses and 400, 425, 450, 475, and 500 mm for the buckling analyses. FE-models were developed which considered the boards as orthotropic and were able to determine their load-displacement behaviour considering the effects of geometric non-linearities. Results of the analyses showed that orthotropy have significant effects on the bending while shear deformation influences both the bending and buckling behaviour of oriented strand boards. In bending, the effects are generally higher in the main strength than in the secondary strength direction. In buckling, it is a reduction in the buckling loads in a range of between 4% and 26%, compared to what would have been obtained using the Euler equation. An alternative Equation with a better ability to predict the one-dimensional buckling load of wood-based boards was presented and discussed.

摘要

文献中充满了对人造板进行的研究。然而，关于正交性和剪切变形对定向刨花板一维屈曲行为影响的研究还很缺乏。本研究采用厚度为 12、18 和 25 毫米的试样，逐步研究和讨论正交性和剪切变形对定向刨花板弯曲和一维屈曲行为的影响，测量 400弯曲分析的长度为 780 毫米，屈曲分析的长度为 400、425、450、475 和 500 毫米。开发了 FE 模型，该模型将板视为正交各向异性，并且能够在考虑几何非线性效应的情况下确定其负载位移行为。分析结果表明，各向异性对弯曲有显着影响，而剪切变形对定向刨花板的弯曲和屈曲行为都有影响。在弯曲中，主要强度的影响通常高于次要强度方向。在屈曲中，与使用欧拉方程获得的结果相比，屈曲载荷减少了 4% 到 26%。提出并讨论了一个替代方程，该方程能够更好地预测人造板的一维屈曲载荷。与使用欧拉方程获得的结果相比，屈曲载荷减少了 4% 到 26%。提出并讨论了一个替代方程，该方程能够更好地预测人造板的一维屈曲载荷。与使用欧拉方程获得的结果相比，屈曲载荷减少了 4% 到 26%。提出并讨论了一个替代方程，该方程能够更好地预测人造板的一维屈曲载荷。