Three-point bending tests were performed on specimens of glued laminated timber with different specimen heights to failure to determine the relationship between specimen height and bending strength under tension perpendicular to the grain. For the three-point bending tests, two types of glued laminated timber composed of homogeneous grade timber, as specified in the Japanese Agricultural Standard, were used. The laminae used for the glued laminated timber were L80 grade Scots pine and L110 grade Scots pine. The specimens used in the three-point bending tests had dimensions of 105 mm (width) and 10–300 mm (height). The experimental results showed that the bending strength decreased as the specimen height increased, but the rate of decrease in the bending strength decreased with increasing specimen height when the specimen height exceeded 100 mm. From the relationship between the bending strength and specimen height, parameters that fit Bažant’s size-effect law were derived, and for a specimen height of approximately 100 mm, the bending strength was equal to the perpendicular-to-the-grain tensile strength.

中文翻译：

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通过三点弯曲试验估算苏格兰松树胶合层压木材的垂直于谷物的抗拉强度

对具有不同样品高度的胶合层压木材样品进行三点弯曲试验，以测定样品高度与垂直于谷物的拉力下的弯曲强度之间的关系。对于三点弯曲测试，使用了日本农业标准中指定的两种由均质等级木材组成的胶合层压木材。用于胶合层压木材的薄片是L80级苏格兰松树和L110级苏格兰松树。三点弯曲测试中使用的样品尺寸为105毫米（宽）和10-300毫米（高）。实验结果表明，随着试件高度的增加，抗弯强度降低，但当试件高度超过100mm时，抗弯强度的降低速率随试件高度的增加而减小。