Comparison of Theoretical and Laboratory Out-of-Plane Shear Stiffness Values of Cross Laminated Timber Panels

Niederwestberg, Jan; Zhou, Jianhui; Chui, Ying Hei

doi:10.3390/buildings8100146

Cited by 10 publications

(6 citation statements)

References 9 publications

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“…Like the above-mentioned, a comparison between the Timoshenko theory and the SAM with respect to the experimental results obtained on 3-and 5-layer CLT panels is reported in Niederwestberg et al [18]. An advancement to the results is also provided by the modified γ-method and by a specific 2D numerical model-properly developed by the authors-have been compared in this paper, thus enlarging the field of available results in the scientific literature.…”

Section: Introductionmentioning

confidence: 73%

“…The latter two methods are based on a more accurate theory, but a greater computational effort is required for their applications. A comparison between Timoshenko theory and SAM with respect to the experimental results obtained on 3-and 5-layer CLT panels is reported in Niederwestberg et al [18]. Alternatively, a modification of γ-method-included in the current version of Eurocode 5 for calculating composite timber beams-has been proposed as suitable for accounting the rolling shear effect in CLT floor elements [19].…”

Section: Rolling Shear Phenomenonmentioning

confidence: 99%

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The Rolling Shear Influence on the Out-of-Plane Behavior of CLT Panels: A Comparative Analysis

Sandoli

Calderoni

2020

Buildings

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This paper deals with the influence of the rolling shear deformation on the flexural behavior of CLT (Cross-Laminated Timber) panels. The morphological configuration of the panels, which consist of orthogonal overlapped layers of boards, led to a particular shear behavior when subjected to out-of-plane loadings: the low value of the shear modulus in orthogonal to grain direction (i.e., rolling shear modulus) gives rise to significant shear deformations in the transverse layers of boards, whose grains direction is perpendicular with respect to the tangential stresses direction. This produces increases of deflections and vibrations under service loads, creating discomfort for the users. Different analytical methods accounting for this phenomenon have been already developed and presented in literature. Comparative analyses among the results provided by some of these methods have been carried out in the present paper and the influence of the rolling shear deformations, with reference to different span-to-depth (L/H) ratios investigated. Moreover, the analytical results have also been compared with those obtained by more accurate 2D finite element models. The results show that, at the service limit states, the influence of the rolling shear can be significant when the aspect ratios became less than L/H = 30, and the phenomenon must be accurately considered in both deflection and stress analysis of CLT floors. Contrariwise, in the case of higher aspect ratios (slender panels), the deflections and stresses can be evaluated neglecting the rolling shear influence, assuming the layers of boards as fully-connected.

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Section: Introductionmentioning

confidence: 73%

Section: Rolling Shear Phenomenonmentioning

confidence: 99%

The Rolling Shear Influence on the Out-of-Plane Behavior of CLT Panels: A Comparative Analysis

Sandoli

Calderoni

2020

Buildings

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“…The restrictions for the Euler-Bernoulli beam theory lose their validity and the Timoshenko beam theory needs to be applied, which is a common method for calculating wood constructions. [24,[29][30][31][32][33] According to the Timoshenko beam theory, the total displacement is the sum of bending and shear displacement [24] w total ¼ w bending þ w shear (1)…”

Section: Calculation Of the Component Stiffnessmentioning

confidence: 99%

Calculation Concept for Wood‐Based Components in Mechanical Engineering

Kluge

Eichhorn

2023

Adv Eng Mater

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Herein, an approach is described for a calculation concept to close the gap between lightweight construction and necessary safety for structural components made of wood materials with use in mechanical engineering. The calculation of wood‐based materials represents a challenge due to the orthotropic material behavior and the many influencing parameters on the mechanical properties. The main objective of the considerations is to predict the mechanical component behavior as precisely as possible. In the next step, the designer can use the results of the calculations to make statements about the component safety. The analyses of this article are part of the joint project “Wood‐based materials in mechanical engineering (HoMaba)”.

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“…The most commonly used shear form factor value is 6/5 proposed by Reissner [23] based on First order shear deformation theory (FSDT). Shear form factor value of 12/π 2 was proposed by Mindlin [24] and shear form factor was proposed to be a function of Poisson's ratio by Cowper [25].…”

Section: Shear Form Factormentioning

confidence: 99%

Evaluating Timoshenko Method for Analyzing CLT under Out-of-Plane Loading

et al. 2020

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Cross-laminated timber (CLT) is an engineered wood product made up of layers of structurally graded timber, where subsequent layers are oriented orthogonally to each other. In CLT, the layers oriented in transverse direction, generally termed as cross-layer, are subjected to shear in radial–tangential plane, which is commonly known as rolling shear. As the shear modulus of cross-layers is significantly lower than that in other planes, CLT exhibits higher shear deformation under out-of-plane loading in contrast to other engineered wood products such as laminated veneer lumber (LVL) and glue laminated timber (GLT). Several analytical methods such as Timoshenko, modified gamma and shear analogy methods were proposed to account for this excessive shear deformation in CLT. This paper focuses on the effectiveness of Timoshenko method in hybrid CLT, in which hardwood cross-layers are used due to their higher rolling shear modulus. A comprehensive numerical study was conducted and obtained results were carefully analyzed for a range of hybrid combinations. It was observed that Timoshenko method could not accurately predict the shear response of CLTs with hardwood cross layers. Comprehensive parametric analysis was conducted to generate reliable numerical results, which were subsequently used to propose modified design equations for hybrid CLTs.

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Comparison of Theoretical and Laboratory Out-of-Plane Shear Stiffness Values of Cross Laminated Timber Panels

Cited by 10 publications

References 9 publications

The Rolling Shear Influence on the Out-of-Plane Behavior of CLT Panels: A Comparative Analysis

The Rolling Shear Influence on the Out-of-Plane Behavior of CLT Panels: A Comparative Analysis

Calculation Concept for Wood‐Based Components in Mechanical Engineering

Evaluating Timoshenko Method for Analyzing CLT under Out-of-Plane Loading

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