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Finite element modelling of castellated timber I-joists

机译：齿形木材工字梁的有限元建模

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This paper focuses on the structural analysis of innovative composite timber I-joists with castellated webs. The castellation process is carried out by cutting the web in a zig-zag pattern at mid-depth and then rejoining at an offset distance to create hexagonal holes. The flanges of the joists were made from Norway Spruce whilst the webs were made from oriented strandboard (OSB). The joists were analysed using the finite element method (FEM) with the component materials modelled as linear elastic orthotro-pic materials in both tension and compression. Good correlation was found between the experimental results and the FE simulations. The stiffness ratios obtained from test and FEA data (EI_(test)/EI_(FEA)) were between 1.03 and 1.36 for the 241 mm joists and between 0.89 and 1.10 for the 305 mm joists. At peak load the FEA model predicted displacements of between 0.80 and 1.02 times that of the test for the 241 mm joists and between 0.98 and 1.16 times that of the test for the 305 mm joists. The validated FE models are compared to equivalent solid webbed joists to assess the effect the castellated webs have on their structural performance. A geometric parameter study was carried out to determine the optimum web opening geometry in terms of structural performance.
机译：本文重点研究了带腹板腹板的创新型复合木材工字梁的结构分析。通过在中深度处以锯齿形切割腹板，然后以一定的偏移距离重新接合以创建六角形孔，来进行cast形加工。托梁的法兰由挪威云杉制成，而腹板则由定向刨花板（OSB）制成。使用有限元方法（FEM）对托梁进行了分析，其组成材料在拉伸和压缩方面均建模为线性弹性正交各向异性材料。在实验结果和有限元模拟之间发现了良好的相关性。从测试和FEA数据获得的刚度比（EI_（test）/ EI_（FEA））对于241 mm托梁为1.03至1.36，对于305 mm托梁为0.89至1.10。在峰值载荷下，FEA模型预测的位移为241 mm托梁的试验位移的0.80至1.02倍，而305 mm托梁的试验位移的试验值为0.98至1.16倍。将经过验证的有限元模型与等效的固体网状托梁进行比较，以评估带齿腹板对其结构性能的影响。进行了几何参数研究，以根据结构性能确定最佳的腹板开口几何形状。

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