Abstract
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.
Highlights
Cross-laminated timber (CLT) is a composite panel product with 3–9 layers whose grain directions alternate between 0° and 90°
This study aims to examine the relation between rolling shear properties of cross layers and the shear capacity of CLT
To evaluate the out-of-plane shear performance of hinoki and sugi (Japanese cedar) hybrid CLT, four different layer configurations were tested in threepoint and asymmetric four-point bending tests
Summary
Cross-laminated timber (CLT) is a composite panel product with 3–9 layers whose grain directions alternate between 0° and 90°. Since it has longitudinal grain in two directions, it can be implemented in structural walls and floors. Domestic softwoods are used for the production of CLT in Japan. Among the domestic softwood species, sugi (Japanese cedar, Cryptomeria japonica) is the most produced [1]. Due to its relatively low bending modulus of elasticity, other softwood species are adopted for the outer layer in cases where higher bending stiffness is required. Mixed-layer configurations with other softwood species are effective for increasing bending stiffness, the shear capacity of the hybrid layer configurations is largely
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