Abstract
With the increasing availability of fast-growing Eucalyptus plantation logs in Australia in recent years, the timber manufacturing sector has become interested in discovering the opportunities of producing value-added timber products from this resource. Cross-laminated timber (CLT) could be a potential sustainable product recovered from this resource and supply material for commercial buildings. Shear of the inner cross-laminates, known as rolling shear, is one of the governing factors in serviceability and limit state design for this product under out-of-plane loading. This study evaluated the rolling shear (RS) properties of CLT with heterogonous layup configurations using different structural grade Eucalyptus nitens (E. nitens) timber under the planar shear test. Based on the results, Gr and τr values were shown to be significantly correlated with the density of the CLT panel. There was also a positive correlation between the RS modulus and MOR of the CLT panel. The specimens with high MOE in the top and bottom layers indicated the highest τr and Fmax values. This indicated that using high-grade boards in the top and bottom lamellae plays an important role in increasing the RS strength, whereas using them in the cross-layer has a positive contribution in increasing shear modulus. The maximum observed RS strength and modulus ranged from 2.8–3.4 MPa and 54.3–67.9 MPa, respectively, exceeding the RS characteristic values of the resource. The results obtained in this study were comparable to those recommended in European standards for softwood CLT, demonstrating the potential use for eucalypt timber boards in CLT production. This paper provides an important insight into supporting the potential engineering applications of CLT panel products fabricated with eucalypt plantation.
Highlights
Introduction published maps and institutional affilThe majority of Australia’s hardwood plantations are Eucalyptus genus, and almost 29.5 million cubic metres were harvested during the period 2019–2020 [1].The majority of this hardwood plantation has been managed for pulpwood application [2].Given its scale, timber producers are seeking to recover value-added timber products from this resource to potentially replace imports and create new markets for plantation hardwood timber in the Australian building sector
This can be attributed to the higher average modulus of elasticity (MOE) of timber boards used in the top and bottom lamination compared to the other configuration
This study presented novel experimental research performed on cross-laminated timber (CLT) blocks under planar shear test to investigate the rolling shear properties of CLT panels made of Australian grown plantation E. nitens
Summary
Introduction published maps and institutional affilThe majority of Australia’s hardwood plantations (over 884,000 ha) are Eucalyptus genus, and almost 29.5 million cubic metres were harvested during the period 2019–2020 [1].The majority of this hardwood plantation has been managed for pulpwood application [2].Given its scale, timber producers are seeking to recover value-added timber products from this resource to potentially replace imports and create new markets for plantation hardwood timber in the Australian building sector. The majority of Australia’s hardwood plantations (over 884,000 ha) are Eucalyptus genus, and almost 29.5 million cubic metres were harvested during the period 2019–2020 [1]. The majority of this hardwood plantation has been managed for pulpwood application [2]. Timber producers are seeking to recover value-added timber products from this resource to potentially replace imports and create new markets for plantation hardwood timber in the Australian building sector. According to the forest product annual review, the global production capacity of CLT in recent years is estimated at 2.8 million cubic meters in the world, and new development in this sector has been taking place [3]. The timber sawn from this resource contains a significant amount of strength reducing iations
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