In this study, the out-of-plane shear strength of hybrid cross-laminated timber (CLT) with outer layers of hinoki (hinoki cypress, Chamaecyparis obtusa) and inner layers of sugi (Japanese cedar, Cryptomeria japonica) is investigated for four different layer configurations. To investigate the influence from rolling shear properties of cross layers on the shear strength of CLT, stress analysis was conducted using the shear analogy method. The nominal shear strength, the maximum shear force divided by the cross-section of CLT, was in the 1.0–2.1 MPa range. Using the shear analogy method, the rolling shear modulus in the cross layer was determined as 72.9 MPa, which was comparable with the value obtained for laminae in previous study as well as the value confirmed by strain measurements in the present study. The magnitude of rolling shear stress in the cross layer was 0.9–1.1 times the average shear stress, which was negatively correlated with the nominal shear strength. From the regression line between the nominal shear strength and the magnitude of the shear stress in the cross layer, the mean shear strength of the cross layer was estimated to be 1.33 MPa.

中文翻译：

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杂种（扁柏和日本雪松）交叉层压木材的剪切强度特性

在这项研究中，研究了混合交叉层压木材（CLT）的平面外剪切强度，该复合材料具有四种不同的扁柏（扁柏柏，Chamaecyparis obtusa）和杉杉（日本雪松，柳杉）的内层层配置。为了研究交叉层的滚动剪切性能对CLT剪切强度的影响，采用剪切类比法进行了应力分析。标称剪切强度（最大剪切力除以CLT的横截面）在1.0-2.1 MPa的范围内。使用剪切类比法，在横层中的滚动剪切模量确定为72.9 MPa，这与先前研究中的层流值以及本研究中通过应变测量确认的值相当。交叉层中滚动剪切应力的大小是平均剪切应力的0.9-1.1倍，与名义剪切强度呈负相关。从标称剪切强度与交叉层中剪切应力的大小之间的回归线，估计交叉层的平均剪切强度为1.33 MPa。