This paper experimentally evaluates the embedment strength of laminated veneer lumbers (LVL) and cross-banded laminated veneer lumbers (LVL-C) manufactured from blending spotted gum (Corymbia citriodora) or white cypress pine (Callitris glaucophylla) veneers with hoop pine (Araucaria cunninghamii) veneers. Nominal 3.0 mm thick veneers were rotary peeled from small diameter (less than 30 cm) native forest sourced spotted gum and white cypress pine logs, and plantation grown hoop pine logs. 12-ply × 1.2 m (long) × 0.9 m (wide) LVL and LVL-C panels were manufactured using ten different construction strategies by mixing (i) the number of veneers from each species, (ii) the modulus of elasticity of the veneers and (iii) the veneer orientations (cross-banding). A total of 672 embedment tests, using three different dowel diameters and four different load-to-grain orientation angles, were performed using the half-hole test method described in the ASTM D5764-97a. This paper (i) compares the proportional limit strength, 5%-offset embedment strength and maximum embedment strength across the different construction strategies adopted in the study, and (ii) discusses the results in terms of load-to-grain angle and dowel diameter. More importantly, the test results are also compared to the embedment strength prediction equations detailed in the Eurocode 5 to determine their suitability for mixed-species LVL and LVL-C products. Overall, the mixed-species LVL and LVL-C showed significantly higher 5%-offset embedment strengths than single-species commercial softwood LVL products. The effect of the cross-banded veneers on the embedment strength was not found to be significant. However, the LVL-C samples exhibited a highly ductile behaviour for all load-to-grain angles and dowel diameters when compared to the LVL samples. The experimentally determined 5%-offset and maximum embedment strengths for the mixed-species LVL were on average equal to and 7% higher than the predicted values given in Eurocode 5.

中文翻译：

---

混种胶合板和交叉胶合板的包埋强度

本文通过实验评估了由点胶（Corymbia citriodora）或白柏松（Callitris glaucophylla）单板与环松（Araucaria cunninghamii）混合而成的层压单板木材（LVL）和交叉粘合的层压单板木材（LVL-C）的嵌入强度）贴面。从小直径（小于30厘米）原生林中发现的斑点胶和白柏松原木，以及人工种植的箍松原木中，将名义上的3.0毫米厚的单板旋转剥皮。通过混合（i）每个物种的单板数量，（ii）弹性模量，使用十种不同的建造策略，制造12层×1.2 m（长）×0.9 m（宽）的LVL和LVL-C面板单板和（iii）单板取向（交叉绑扎）。使用ASTM D5764-97a中所述的半孔测试方法，使用三种不同的销直径和四种不同的载荷-晶粒定向角，总共进行了672次嵌入测试。本文（i）比较了研究中采用的不同施工策略的比例极限强度，5％偏移嵌入强度和最大嵌入强度，（ii）讨论了相对于载荷的夹角和销钉直径的结果。更重要的是，还将测试结果与欧洲规范5中详述的嵌入强度预测方程式进行比较，以确定它们对混合物种LVL和LVL-C产品的适用性。总体而言，混合品种的LVL和LVL-C表现出比单一种类的商品软木LVL产品更高的5％偏移包埋强度。交叉胶合贴面对嵌入强度的影响未发现明显。但是，与LVL样品相比，LVL-C样品在所有载荷-颗粒角度和销直径上均表现出高度的延展性。