Prediction of bending load capacity of timber beams using a finite element method simulation of knots and grain deviation

Baño, Vanesa; Martitegui, Francisco Arriaga; Soilán, A.; Fernández, Manuel Guaita

doi:10.1016/j.biosystemseng.2011.05.008

Cited by 55 publications

(30 citation statements)

References 9 publications

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“…Several studies have already shown that mean grain angle is correlated to boards' mechanical properties (Pope et al 2005, Brännström et al 2008. Baño et al (2011) also showed that the association of slope of grain and nodosity measurements in a finite element model conducts to a high correlation between experimental and predicted bending strength (R 2 = 0.88). The consideration of the slope of grain appears to be effective, but finite element method is not industrially applicable because of the computational time.…”

Section: Strength Grading Technologiesmentioning

confidence: 90%

Improving strength grading of timber by grain angle measurement and mechanical modeling

Viguier

Jehl

Collet

et al. 2014

Wood Material Science & Engineering

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Timber strength grading has become a major issue in the European Union during the last years, due to the introduction of the Eurocode 5 and all its related standards. Currently, the most performing strength grading machines are able to locally detect the boards' knots sizes and positions and interpret this information through adapted grading models. The best lead to improve their accuracy seems to be the introduction of new information about the boards and adapt the mechanical model to take them in account. Small grain angle causes high reduction of clear wood's mechanical properties; local value of slope of grain appears to be of high interest. The aim of this study is to quantify the additional accuracy that grain angle information can bring to an optical scanner used as a strength grading machine. A specific grading model has been developed accordingly, and the results obtained for different machine/model/loading combinations are presented. These results show that slope of grain measurement can significantly improve the accuracy of the optical scanner, for both modulus of elasticity and modulus of rupture estimations.

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Section: Strength Grading Technologiesmentioning

confidence: 90%

Improving strength grading of timber by grain angle measurement and mechanical modeling

Viguier

Jehl

Collet

et al. 2014

Wood Material Science & Engineering

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show abstract

“…The traditional stitching 5-purlin beam is shown in Fig.1. [1,2,3,4,5,6,7,8]. But the connecting conformation and the wood material were all different from those of Chinese stitching timber beams.…”

Section: Introductionmentioning

confidence: 86%

Flexural Behavior of Typical Chinese Traditional Timber Stitching Beams

Chun

Balen

Pan

2014

International Journal of Architectural Heritage

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In Chinese traditional timber buildings, stitching is a very common way. When the bearing capacity or the rigidity is not adequate, a timber beam is often strengthened with another beam with stitching method. The timber stitching beams are mainly of two types, including Downloaded by [University of Nebraska, Lincoln] at 23:54 10 April 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 small-top-big-bottom type and big-top-small-bottom type respectively. In order to study the bending behavior of these two types of timber stitching beams, including the failure mode, the flexural capacity, the strain distribution at mid-span section and the maximum deflection, bending tests are carried out on fourteen timber stitching beams with Chinese traditional conformation. Seven of them are pine beams and the others are fir beams. The results show that the failure modes of the small-top-big-bottom type of stitching beams all show brittle fractures at the bottoms of the bottom beams. The failure modes of the big-top-small-bottom type of stitching beams all show brittle fractures at the bottoms of the top beams. The distribution of section strain along the height of each part of the beam basically obeys plane hypothesis. Based on the theoretical and experimental analysis, the calculation formulas of flexural capacity and maximum deflection of these two types of timber stitching beams made of pine and fir are presented respectively.

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“…One of the first papers that considered simultaneously wooden structures and calculation by FEM in rural constructions is that of Wright and Manbeck (1992). Other groups that have worked on this subject are those leaded by Gebremedhin (Cabrero and Gebremedhin, 2009), Lam (He et al, 2001), Gupta (van de Lindt et al, 2009) or Guaita (Baño et al, 2011). FEM has been used in studying greenhouse structures, analysing both the support elements and flexible plastic coverings or the foundations (their special problem of being on traction).…”

Section: Finite Element Methods In Buildings and Infrastructures Areasmentioning

confidence: 99%

Present and future of the numerical methods in buildings and infrastructures areas of biosystems engineering

Ayuga

2015

J Agricult Engineer

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Biosystem engineering is a discipline resulting from the evolution of the traditional agricultural engineering to include new engineering challenges related with biological systems, from the cell to the environment. Modern buildings and infrastructures are needed to satisfy crop and animal production demands. In this paper a review on the status of numerical methods applied to solve engineering problems in the field of buildings and infrastructures in biosystem engineering is presented. The history and basic background of the finite element method is presented. This is the first numerical method implemented and also the more developed one. The history and background of other two more recent methods, with practical applications, the computer fluids dynamics and the discrete element method are also presented. Besides, a review on the scientific and professional applications on the field of buildings and infrastructures for biosystem engineering needs is presented. Today we can simulate engineering problems with solids, engineering problems with fluids and engineering problems with particles and get to practical solutions faster and cheaper than in the past. The paper encourages young engineers and researchers to make progress these tools and their engineering applications. The capacities of all numerical methods in their present development status go beyond the present practical applications. There is a broad field to work on it. IntroductionThe present paper is a review of the numerical methods at present and their applications in solving engineering problems. The field is too wide to be considered in a single article. This is why the paper focuses on presenting the fundamentals of the most significant numerical methods that can be applied for buildings and infrastructures areas of biosystems engineering. The three next numerical methods will be considered: i) finite element method (FEM); ii) computer fluid dynamics (CFD); iii) discrete element method (DEM).In the paper the main features of these methods will be presented along with showing some examples in areas of biosystems engineering. Modern engineering can be considered to begin with the industrial revolution in the late eighteenth and early nineteenth century. From the very beginning, it has used the most powerful mathematical tools of the time in order to solve problems arising in practice. It was considered a fact that it was essential acquiring solid mathematical foundations for being a good engineer. The programs of studies from all Universities of the time prove it so. Even great figures on mathematics of the nineteenth and twentieth centuries were formally engineers. This symbiosis has produced good results for society. In the second half of XX Century, the fast development of computer science produced a great advance in numerical methods applied to physics and engineering.Based on this premise, the predictable future is that calculation and structural analysis in all fields of engineering will be based on modern numerical methods. This power...

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Prediction of bending load capacity of timber beams using a finite element method simulation of knots and grain deviation

Cited by 55 publications

References 9 publications

Improving strength grading of timber by grain angle measurement and mechanical modeling

Improving strength grading of timber by grain angle measurement and mechanical modeling

Flexural Behavior of Typical Chinese Traditional Timber Stitching Beams

Present and future of the numerical methods in buildings and infrastructures areas of biosystems engineering

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