Effects of the width and lay-up of sugi cross-laminated timber (CLT) on its dynamic and static elastic moduli, and tensile strength

Ido, Hirofumi; Nagao, Hirofumi; Harada, Masaki; Kobayashi, Hideo; Ogiso, Junko; Miyatake, Atsushi

doi:10.1007/s10086-015-1527-2

Cited by 10 publications

(18 citation statements)

References 4 publications

(4 reference statements)

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“…They found that the bending creep performance perpendicular to the grain was improved by cross-lamination. The effects of width and lay-up on the tensile strength of CLT were studied by Ido et al [14]. The elastic modulus of CLT made of Sugi with different layups was measured by dynamic and static methods, and tensile tests were conducted for different widths and lay-ups.…”

Section: Introductionmentioning

confidence: 99%

Effects of the thickness of cross-laminated timber (CLT) panels made from Irish Sitka spruce on mechanical performance in bending and shear

Sikora

McPolin

Harte

2016

Construction and Building Materials

135

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An investigation was carried out on CLT panels made from Sitka spruce in order to establish the effect of the thickness of CLT panels on the bending stiffness and strength and the rolling shear. Bending and shear tests on 3-layer and 5-layer panels were performed with loading in the out-of-plane and in-plane directions. 'Global' stiffness measurements were found to correlate well with theoretical values. Based on the results, there was a general tendency that both the bending strength and rolling shear decreased with panel thickness. Mean values for rolling shear ranged from 1.0 N/mm 2 to 2.0 N/mm 2. Highlights-The thicker the CLT panel is, the lower its bending and rolling shear strengths.-Rolling shear strength values for Sitka spruce of 1.0-2.0 N/mm 2 .-'Global' deformation results closely match theoretical stiffness.-Cross-lamination provides no strengthening effect for in-plane bending behaviour.

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Section: Introductionmentioning

confidence: 99%

Effects of the thickness of cross-laminated timber (CLT) panels made from Irish Sitka spruce on mechanical performance in bending and shear

Sikora

McPolin

Harte

2016

Construction and Building Materials

135

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“…Oh et al [8] proposed a lamina-property-based model for predicting the compressive strength of CLT panels, and revealed that the CLT compressive strength increased with an increase of the lamina number. Ido et al [9] analyzed the effects of width and layups on the CLT tensile strength, and found that the tensile strength calculated using the Young's modulus of the lamina of each layer was in agreement with the measured tensile strength.…”

Section: Introductionmentioning

confidence: 80%

Bending, shear, and compressive properties of three- and five-layer cross-laminated timber fabricated with black spruce

Sun

et al. 2020

J Wood Sci

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Cross-laminated timber (CLT) is an innovative engineering wood product made by gluing layers of solid-sawn lumber at perpendicular angles. The commonly used wood species for CLT manufacturing include spruce-pine-fir (SPF), douglas fir-larch, and southern pine lumber. With the hope of broadening the wood species for CLT manufacturing, the purposes of this study include evaluating the mechanical properties of black spruce CLT and analyzing the influence of CLT thickness on its bending or shear properties. In this paper, bending, shear, and compressive tests were conducted respectively on 3-layer CLT panels with a thickness of 105 mm and on 5-layer CLT panels with a thickness of 155 mm, both of which were fabricated with No. 2-grade Canadian black spruce. Their bending or shear resisting properties as well as the failure modes were analyzed. Furthermore, comparison of mechanical properties was conducted between the black spruce CLT panels and the CLT panels fabricated with some other common wood species. Finally, for both the CLT bending panels and the CLT shear panels, their numerical models were developed and calibrated with the experimental results. For the CLT bending panels, results show that increasing the CLT thickness whilst maintaining identical span-to-thickness ratios can even slightly reduce the characteristic bending strength of the black spruce CLT. For the CLT shear panels, results show that increasing the CLT thickness whilst maintaining identical span-to-thickness ratios has little enhancement on their characteristic shear strength. For the CLT bending panels, their effective bending stiffness based on the Shear Analogy theory can be used as a more accurate prediction on their experiment-based global bending stiffness. The model of the CLT bending specimens is capable of predicting their bending properties; whereas, the model of the CLT shear specimens would underestimate their ultimate shear resisting capacity due to the absence of the rolling shear mechanism in the model, although the elastic stiffness can be predicted accurately. Overall, it is attested that the black spruce CLT can provide ideal bending or shear properties, which can be comparable to those of the CLT fabricated with other commonly used wood species. Besides, further efforts should focus on developing a numerical model that can consider the influence of the rolling shear mechanism.

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“…Tensile strength predictions were evaluated for 74 test results of CLT specimens using the methods proposed by Unterwieser et al [16] (Eq. ( 4)) and Ido et al [7] (Eq. ( 8)).…”

Section: Weighted Averagementioning

confidence: 99%

“…3.2 Ido et al [7] for Tensile Strength Ido et al [7] conducted tensile strength tests on CLT samples by varying the cross-sectional width and the number of lamellae. Based on the test results conducted on CLTs made from Japanese Sugi, a new equation was proposed (Eq.…”

Section: Unterwieser Et Al [16] For Bending Tensile and Compressive Strengthmentioning

confidence: 99%

“…Nevertheless, strength perpendicular to the grain also requires attention for various structural applications, and numerical simulations to conduct reliable parametric studies. Brandner et al [6] explored the tensile properties perpendicular to the grain of Norway spruce species, whereas Ido et al [7] investigated the tensile properties parallel to the grain of Japanese Sugi. A state-of-the-art review on compressive properties perpendicular to the grain was conducted by Brandner [8].…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study on Various Strength Parameters of Structural Elements Made from Cross-Laminated Timber

Anwar‐Us‐Saadat¹,

Goonewardena²,

Kafle³

et al. 2022

Journal of Renewable Materials

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Cross laminated timber (CLT) is an innovative and environment friendly engineered timber product with superior structural performance. CLT offers strong resistance against both in-plane and out-of-plane loading. Hence, it is widely used as floors, roofs or wall elements. Considerable experimental research on CLT under various loading conditions has been done in the recent past. This article presents a comprehensive review of various design methods to determine basic mechanical properties such as tension, compression and rolling shear strength of CLT with primary focus on Norway spruce. All relevant experimental data available from existing literature were collated and consequently been used to evaluate the performance of various methods to design CLT structures. The comparison revealed that different methods show considerable variance in predicting the capacity of CLT panels due to the variation in timber species, which affects the corresponding mechanical properties of the lamella. In addition to species, rolling shear properties can also vary considerably depending on the type of experimental technique used for testing. A predictive model has also been proposed to correlate rolling shear strength obtained from shear analogy method to that obtained using planar shear.

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Effects of the width and lay-up of sugi cross-laminated timber (CLT) on its dynamic and static elastic moduli, and tensile strength

Cited by 10 publications

References 4 publications

Effects of the thickness of cross-laminated timber (CLT) panels made from Irish Sitka spruce on mechanical performance in bending and shear

Effects of the thickness of cross-laminated timber (CLT) panels made from Irish Sitka spruce on mechanical performance in bending and shear

Bending, shear, and compressive properties of three- and five-layer cross-laminated timber fabricated with black spruce

Comparative Study on Various Strength Parameters of Structural Elements Made from Cross-Laminated Timber

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