Effective stiffness prediction of GLT beams based on stiffness distributions of individual lamellas

Kandler, Georg; Füssl, Josef; Serrano, Erik; Eberhardsteiner, Josef

doi:10.1007/s00226-015-0745-5

Cited by 23 publications

(25 citation statements)

References 19 publications

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“…The used boards were inspected using a tracheid effectbased laser scanning device, yielding the fibre angle on all surfaces (Nyström 2003;Simonaho et al 2004;Petersson 2010). For a more detailed description of the procedure it is referred to Olsson et al (2013) and Kandler et al (2015), where the fibre angle measurements have been used to obtain a stiffness profile for each board.…”

Section: Methodsmentioning

confidence: 99%

“…E ≡ E(x) . The procedure for the first type of stiffness profile is presented in Kandler et al (2015), where fibre angle measurements obtained through laser scanning are directly used to transform the clearwood stiffness tensor. This approach is similar to the approach presented in Olsson et al (2013), where the clearwood stiffness tensor was obtained by combining dynamic eigenfrequency measurements with a dynamic finite element analysis.…”

Section: Stiffness Profilesmentioning

confidence: 99%

“…In Kandler et al (2015), the approach is based on the same principle of transforming the clearwood stiffness tensor according to the fibre angle. Therein, in addition to the in-plane fibre angle, an empirical model for the diveangle was employed and the clearwood stiffness tensor was obtained from a micromechanical model based on a multiscale homogenisation procedure (Hofstetter et al 2007).…”

Section: Stiffness Profilesmentioning

confidence: 99%

“…The work of Kandler et al (2015) was based on an experimental study performed at Linnaeus University, Sweden. While Kandler et al (2015) covered the linear elastic behaviour, this work focuses on structural failure mechanisms observed during the experimental study.…”

Section: Introductionmentioning

confidence: 99%

“…While Kandler et al (2015) covered the linear elastic behaviour, this work focuses on structural failure mechanisms observed during the experimental study. It is the aim of this work to relate (a) the stiffness profile information presented in Kandler et al (2015) and (b) the knot geometries reconstructed using the approach presented in Kandler et al (2016) to the failure mechanisms observed in the experimental study.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on glued laminated timber beams with well-known knot morphology

2018

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Nowadays, the impact of knots on the failure behaviour of glued laminated timber (GLT) beams is considered by subjecting the single lamellas to a strength grading process, where, i.a., tracheid effect-based laser scanning is used to obtain information about knot properties. This approach single-handedly defines the beam's final strength properties according to current standards. At the same time, advanced production processes of such beams would allow an easy tracking of a scanned board's location, but, at this point, previously obtained detailed information is already disregarded. Therefore, the scanning data is used to virtually reconstruct knot geometries and group them into sections within GLT beams. For this study, a sample of 50 GLT beams of five different configuration types was produced and tested under static four-point-bending until failure. As for each assembled lamella the orientation and position within the corresponding GLT beam is known, several parameters derived from the reconstructed knots can be correlated to effective GLT properties. Furthermore, the crack patterns of the tested beams are manually recorded and used to obtain measures of cracks. A detailed analysis of the generated data and their statistical evaluation show that, in the future, dedicated mechanical models for such timber elements must be developed to realistically predict their strength properties. A potential approach, using fluctuating section-wise effective material properties, is proposed.

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Section: Methodsmentioning

confidence: 99%

Section: Stiffness Profilesmentioning

confidence: 99%

Section: Stiffness Profilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental study on glued laminated timber beams with well-known knot morphology

2018

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Stochastic engineering framework for timber structural elements

Kandler

Lukacevic

Wolff

et al. 2018

Beton und Stahlbetonbau

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Due to the natural growth process of trees, the resulting wooden boards show a high amount of random fluctuation in their mechanical properties. In this work, a framework able to consider the impact of random stiffness fluctuations of wooden boards on the performance of glued laminated timber (GLT) is presented. A 2D finite element model is employed to depict the interactions between individual laminations and is integrated into a commercial robustness analysis and optimisation software package. The mechanical properties of each board are obtained during the grading process and are condensed into so‐called stiffness and strength profiles. Based thereon, a probabilistic material model is developed for the random generation of an arbitrary number of stiffness and strength profiles. On basis of the probabilistic material model and the mechanical FE model, the sensitivity to changes in the design can be explored. Subsequently, the optimal design parameters of the user‐defined structure are identified. An exemplary application scenario shows the workflow for determining the optimum hole dimensions and location in a GLT beam. The material model indicates large scatter in the mechanical properties, leading to conservative results. Nonetheless, the example shows the strengths of the employed workflow from sensitivity analysis to best designs.

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Computational Mechanical Modelling of Wood—From Microstructural Characteristics Over Wood-Based Products to Advanced Timber Structures

Füssl

Lukacevic

Pillwein

et al. 2019

Lecture Notes in Civil Engineering

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Effective stiffness prediction of GLT beams based on stiffness distributions of individual lamellas

Cited by 23 publications

References 19 publications

Experimental study on glued laminated timber beams with well-known knot morphology

Experimental study on glued laminated timber beams with well-known knot morphology

Stochastic engineering framework for timber structural elements

Computational Mechanical Modelling of Wood—From Microstructural Characteristics Over Wood-Based Products to Advanced Timber Structures

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