Multi-scale modelling of rolling shear failure in cross-laminated timber structures by homogenisation and cohesive zone models

Flores, Erick I. Saavedra; Saavedra, Karin; Hinojosa, Jorge; Chandra, Y.; Das, Raj

doi:10.1016/j.ijsolstr.2015.11.027

Cited by 55 publications

(13 citation statements)

References 35 publications

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“…In the non-gluing case, lateral gaps are allowed up to 6 mm by the recent European standard requirements for CLT [3] (Figure 1a). Several studies pointed out the non-negligible influence of these gaps on the mechanical behavior [4,5,6], especially when dealing with in-plane shear stress [7,8]. Enlarging the lateral gaps up to hundreds of millimeters leads to innovative lightweight and less expensive panels having a regular alternation of lamellae and voids (Figure 1b).…”

Section: Introductionmentioning

confidence: 99%

Closed-form solutions for predicting the thick elastic plate behavior of CLT and timber panels with gaps

Franzoni

Lebée

Lyon

et al. 2018

Engineering Structures

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In a former paper by the authors [1], the elastic behavior of Cross Laminated Timber (CLT) and timber panels having periodic gaps between lateral lamellae has been analyzed. A thick plate homogenization scheme based on Finite Elements computations has been applied. The predicted behavior was in agreement with experimental results. In this paper, simplified closed-form solutions are derived in order to avoid FE modeling. Both cases of narrow gaps of CLT panels and wide gaps of innovative lightweight panels are investigated. CLT and timber panels with gaps are modeled as a space frame of beams connected with wooden blocks. The contribution of both beams and blocks to the panel's mechanical response is taken into account, leading to closed-form expressions for predicting the panel's stiffnesses and maximum longitudinal and rolling shear stresses. The derived closed-form solutions are in agreement with the reference FE results and they can be used for practical design purposes.

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Section: Introductionmentioning

confidence: 99%

Closed-form solutions for predicting the thick elastic plate behavior of CLT and timber panels with gaps

Franzoni

Lebée

Lyon

et al. 2018

Engineering Structures

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“…Saavedra Flores et al [13] presented a numerical study regarding the multi-scale modelling of rolling shear failure mode in CLT panels, while Sturzenbecher et al [14] investigated the structural design and modeling by advances plates theory.…”

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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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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“…The basic material value compliant with EN 14080 [28] must be used for the typical shear strength f v,CLT,k and for the mean shear stiffness G CLT,mean parallel to grain, as recommended in [26,29]. Several studies have so far been made with regard to the determination of the rolling shear strength f r,CLT,k and rolling shear stiffness G r,CLT,mean perpendicular to grain, as critical carrying capacity and serviceability parameters for CLT [30][31][32][33][34][35][36][37]. Most studies were conducted using standard European types of softwood [38,39] although activities have been intensified in recent years with regard to the use of non-standard types [40,41], with an emphasis on possible uses of hardwood species [42].…”

Section: Shear Strengthmentioning

confidence: 99%

“…The reduced cross-section of CLT is graphically presented in Figure 17 in which girder thickness t CLT is reduced for the charring depth d char according to expression (35), where k 0 linearly changes from 0 to 1 during first 20 minutes of fire. The full value of d o = 7mm is adopted after 20 minutes for the layer of thermally modified material without bearing capacity, and this is added to the charring depth d char .…”

Section: Fire Resistance Of Cltmentioning

confidence: 99%

Cross-laminated timber (CLT) – a state of the art report

Jeleč¹,

Varevac²,

Rajčić³

2018

JCE

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Cross-laminated timber (CLT)-a state of the art report Cross laminated timber is an innovative plate-shaped product presenting a laminated structure and excellent physicomechanical properties. Due to its high stiffness and in-plane and out-of-plane bearing capacity, it is most often used in form of wall or floor panels. Favourable environmental, aesthetic and energy properties further enhance its qualities. The paper is a summary of CLT research conducted so far, with an emphasis on the need to harmonise existing regulations and include this product in the European standard for timber structures Eurocode 5.

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Multi-scale modelling of rolling shear failure in cross-laminated timber structures by homogenisation and cohesive zone models

Cited by 55 publications

References 35 publications

Closed-form solutions for predicting the thick elastic plate behavior of CLT and timber panels with gaps

Closed-form solutions for predicting the thick elastic plate behavior of CLT and timber panels with gaps

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

Cross-laminated timber (CLT) – a state of the art report

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