Experimental and theoretical investigations on moulded wooden tubes made of beech (Fagus sylvatica L.)

Hartig, Jens; Wehsener, Jörg; Haller, Peer

doi:10.1016/j.conbuildmat.2016.09.042

Cited by 19 publications

(17 citation statements)

References 17 publications

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“…and (ii) six to seven strips for all remaining slender sections. The latter failure mode is shown in Figure 13 (b) and was also observed in [13,32] for formed wood profiles. The slender sections could therefore not reach their potential full capacity and exhibited a failure mode which should be avoided in structures.…”

Section: Compressive Testssupporting

confidence: 77%

“…In the literature, various hollow timber structural solutions have been investigated. They include (i) spirally winded veneer-based Circular Hollow Section (CHS) [7][8][9], (ii) fibre-reinforced moulded wooden tubes [10][11][12][13][14], (iii) octagonal tubes from composite wood flakes panels [15], (iv) nonagon tubes from knot free pine wood strips [16], (v) "wood rings" reinforced with glass epoxy [17] and (vi) LVL type CHS for temporary geotechnical soil nailing systems [18]. Commercially, veneerbased hollow timber solutions are also available, either limited to small diameter cross-sections (up 100 mm) [19] or short lengths (up to 1,000 mm) [20].…”

Section: Introductionmentioning

confidence: 99%

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Structural behaviour of hardwood veneer-based circular hollow sections of different compactness

Gilbert

Underhill

Fernando

et al. 2018

Construction and Building Materials

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This paper presents the capacity and structural behaviour of hardwood veneer-based circular hollow sections (CHS) tested in bending, shear and compression. The sections were manufactured from early to mid-rotation (juvenile) Gympie messmate (Eucalyptus cloeziana) plantation thinned logs. In total twenty-one 167 mm Outside Diameter (OD) × 1.2 m long CHS were manufactured in seven sets of three nominally identical sections. Two different wall thicknesses were investigated to produce nine compact and twelve more slender cross-sections. The sections were also manufactured in three different structural grades. A sudden failure mode was observed in the compression zone of the slender sections tested in bending. In compression, the compact sections showed a ductile behaviour, while the slender sections showed a more brittle behaviour, with the sections bursting into longitudinal strips. While a relationship was observed between the bending and compressive capacities, and the structural grade, no such relationship was noticed for the shear capacity. Comparison to steel and concrete sections of similar outside diameter proved that the timber sections are the most efficient in terms of bending and compressive capacity to linear weight ratio. The timber sections fall behind their steel and concrete counterparts in terms of shear efficiency, however they still have enough shear capacity for representative structural applications.

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Section: Compressive Testssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Structural behaviour of hardwood veneer-based circular hollow sections of different compactness

Gilbert

Underhill

Fernando

et al. 2018

Construction and Building Materials

View full text Add to dashboard Cite

show abstract

“…At the exception of Hartig et. al [21], the few attempts made in the literature to model the behaviour of hollow timber sections did not aim at fully capturing the fracture of the timber observed in Figure 2, see [4,13] for instance, as the compressive sudden failure mode was not always observed. In Hartig et.…”

Section: Generalmentioning

confidence: 99%

“…Hollow timber structural elements, either manufactured from boards or veneers, have been proposed in the literature [1][2][3][4][5][6][7][8][9][10][11][12][13] and some products are commercially available [14,15]. These products have efficient cross-sectional shapes, are lighter than conventional plain timber elements and can be manufactured in sizes currently not available in sawn timber.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental investigations showed that they have the stiffness and strength required to be used, for instance, as structural elements [1,2] and temporary anchor nails [12,16,17]. However, tests performed on Circular Hollow Sections (CHS) manufactured from either juvenile hardwood plantation veneers [1,2] or moulded from beech boards [13], showed that the cross-section in compression could fracture and open. This failure mode linked to the hollowness of the cross-section is not encountered in plain timber structures commonly used in constructions.…”

Section: Introductionmentioning

confidence: 99%

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Veneer-based timber circular hollow section beams: Behaviour, modelling and design

Gilbert

Dias-da-Costa

Lebée

et al. 2020

Construction and Building Materials

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Various forms of timber hollow structural profiles have either been proposed in the literature or are already commercially available. Tests performed on Circular Hollow Section (CHS) beams showed failure modes not usually encountered in timber structures. For relatively thin-walled profiles, a sudden failure in the compression zone, with the opening of the cross-section, was observed. To confidently use and market CHS timber products, design rules considering all possible failure modes must be developed. This paper presents a Finite Element (FE) model of CHS timber beams which captures all experimentally observed failure modes. Cohesive zone elements were used to model the quasi-brittle failure modes of the timber material. The model was validated against ten experimental tests performed on CHS of three different cross-sectional slenderness and manufactured from juvenile hardwood Gympie messmate (Eucalyptus cloeziana) rotary peeled veneers. The model was found to accurately capture the measured structural behaviour and resulted in an average experimental-to-predicted bending capacity ratio of 1.02. The model was also used to explain the mechanisms leading to the sudden compressive failure mode. A parametric study was finally performed on 72 CHS beams of different cross-sectional slenderness. Results showed a strong correlation between the cross-sectional slenderness ratio and section capacity. Design rules are proposed and discussed.

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Multi-physical modeling and numerical simulation of the thermo-hygro-mechanical treatment of wood

Fleischhauer

Kaliske²

2022

Comput Mech

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The contribution at hand introduces computational modeling and realistic simulation concepts for a comprehensive description of the manufacturing and application of densified wood and wooden structures made from molded densified wood. Wood, as a natural material, is characterized by e.g. a very good mechanical load-bearing capacity related to its density. Nevertheless, the ratio between its mechanical properties and its density can be optimized by densification technology for an expanded use of wood in structural engineering. The wood densification process is not only a mechanical process with large and irreversible deformations, it is also denoted by temperature- and moisture-dependent treatments of the wooden specimens. Thus, the introduced approaches to predict the material and structural characteristics of compressed and molded wood consist of an inelastic and multi-physical constitutive modeling of wood at finite deformations as well as the computation of effective structural properties of wood after the thermo-hygro-mechanical densification process. A successful implementation of the modeling concepts into the finite element method (FEM) is presented, which is verified by numerical investigations. A validation of the numerical results is carried out by use of experimental data at beech wood (Fagus Sylvatica, L.), taken from literature.

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Experimental and theoretical investigations on moulded wooden tubes made of beech (Fagus sylvatica L.)

Cited by 19 publications

References 17 publications

Structural behaviour of hardwood veneer-based circular hollow sections of different compactness

Structural behaviour of hardwood veneer-based circular hollow sections of different compactness

Veneer-based timber circular hollow section beams: Behaviour, modelling and design

Multi-physical modeling and numerical simulation of the thermo-hygro-mechanical treatment of wood

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