Probabilistic approach for modelling the load-bearing capacity of glued laminated timber

Fink, Gerhard; Frangi, Andréa; Köhler, Jochen

doi:10.1016/j.engstruct.2015.06.015

Cited by 31 publications

(22 citation statements)

References 15 publications

(36 reference statements)

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“…This is a grading device where, among others, the dynamic modulus of elasticity based on Eigenfrequency measurement (denoted ) and a knot indicator based on X-ray scanning (denoted ) are measured. By using these two indicators the strength and stiffness properties of timber board sections can be estimated according to the material model presented in Fink (2014).…”

Section: Methodsmentioning

confidence: 99%

“…Falk et al 1992; Falk and Colling 1995; Gehri 1995; Schickhofer 1996) and several models to predict the mechanical properties have been developed (e.g. Foschi and Barrett 1980; Colling 1990; Blaß et al 2009; Fink et al 2015; Kandler et al 2018) Some of the experimental studies have been performed on GLT beams with known beam setup; e.g. Ehlbeck and Colling (1987a, 1987b) recorded the position of the timber boards and knots of the lowest 2 lamellas, Fink et al (2015) and Kandler et al (2018) recorded the entire beam setup based on machine grading information.…”

Section: Introductionmentioning

confidence: 99%

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Bending test on large-scale GLT beams with well-known beam setup using machine grading indicator

Fink

Stadelmann

Frangi

2021

International Wood Products Journal

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This paper presents large-scale bending test, up to 19 m length, on glued laminated timber (GLT) beams with well-known beam setup and a model to predict the tensile strength of finger joint connections (FJ). Machine graded timber boards, with information about the dynamic stiffness and local knottiness were used to fabricate 12 GLT beams. The position of the timber boards were tracked throughout the GLT fabrication. To quantify the quality of the FJ additional FJ were fabricated and tested in tension. Based on the results, a model to predict their strength properties based on the grading information of the involved timber boards was developed using maximum likelihood estimation for censored data.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bending test on large-scale GLT beams with well-known beam setup using machine grading indicator

Fink

Stadelmann

Frangi

2021

International Wood Products Journal

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“…Also, Kandler et al 41 investigated the effect of considering random stiffness fluctuations on the performance of glulam. Load bearing capacity of glulam beams was considered to propose a probabilistic technique through Monte Carlo simulation in the study of Frink et al 42 .…”

Section: Introductionmentioning

confidence: 99%

Reliability-based numerical analysis of glulam beams reinforced by CFRP plate

Harrach

Habashneh

Rad

2022

Sci Rep

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Most existed researches consider deterministic numerical analysis when dealing with structural models. However, the test results reveal that uncertainties are existing in most cases regarding some considerations such as material randomness and the lack of experience. Therefore, proposing a probabilistic design models have got attention of researchers according to its important role in predicting accurate performance of the structures. The aim of the proposed work is to consider reliability-based analysis in numerical modelling of glulam beams reinforced with CFRP plates as well as unreinforced glulam beams by considering the properties of used timber material as random variables having mean value and standard deviation taking into consideration that the findings of this study have shown that the reliability index is worked efficiently as a limit which controls the process. Hill yield criterion model is adopted with respect to the data which is obtained from the experimental tests in order to validate the models. Furthermore, a detailed comparison between the reinforced and unreinforced glulam beams are proposed to see the effect of introducing the CFRP plates as a reinforcement material. The results of this study have successfully given a deep understanding of how the uncertainties plays a crucial role on the resulted deformations and stresses in which it was founded by making a comparison between deterministic and probabilistic numerical analysis.

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“…The abovementioned authors draw attention to systems made of different lamella qualities; however, there is the possibility of having the lamellas be joined in their width [ 44 , 45 ] or having them made of different species [ 46 , 47 ]. The created systems result from certain fixed concepts, as described in appropriate standard or the model described in the works of Fink [ 48 ], Foschi and Barrett [ 49 ], or Hernandez et al [ 50 ] may be the basis for their creation. Predicting the future quality of the produced GLT elements is an overriding task for engineers who support this branch of the wood industry because, in contrast to the mass production of wood-based panels with stabilized parameters, testing the produced GLT is expensive and difficult.…”

Section: Introductionmentioning

confidence: 99%

The Usefulness of Pine Timber (Pinus sylvestris L.) for the Production of Structural Elements. Part II: Strength Properties of Glued Laminated Timber

et al. 2020

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The paper assessed the feasibility of manufacturing glued structural elements made of pine wood after grading it mechanically in a horizontal arrangement. It was assumed that the pine wood was not free of defects and that the outer lamellas would also be visually inspected. This would result in only rejecting items with large, rotten knots. Beams of the assumed grades GL32c, GL28c and GL24c were made of the examined pine wood. Our study indicated that the expected modulus of elasticity in bending was largely maintained by the designed beam models but that their strength was connected with the quality of the respective lamellas, rather than with their modulus of elasticity. On average, the bending strength of the beams was 44.6 MPa. The cause of their destruction was the individual technical quality of a given item of timber, which was loosely related to its modulus of elasticity, assessed in a bending test. Although the modulus of elasticity of the manufactured beam types differed quite significantly (11.45–14.08 kN/mm2), the bending strength for all types was similar. Significant differences occurred only during a more detailed analysis because lower classes were characterized by a greater variation of the bending strength. In this case, beams with a strength of 24 MPa to 50 MPa appeared.

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Probabilistic approach for modelling the load-bearing capacity of glued laminated timber

Cited by 31 publications

References 15 publications

Bending test on large-scale GLT beams with well-known beam setup using machine grading indicator

Bending test on large-scale GLT beams with well-known beam setup using machine grading indicator

Reliability-based numerical analysis of glulam beams reinforced by CFRP plate

The Usefulness of Pine Timber (Pinus sylvestris L.) for the Production of Structural Elements. Part II: Strength Properties of Glued Laminated Timber

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