Abstract
Wood is a natural material which is obtained by sawing logs into a desired cross-section. Hence, all wooden parts are, from the outset, of linear shape. Traditional timber structures therefore used to be frameworks of bar-like components. Modern wood technology, however, has made available a wide gamut of industrial-type wood derivates. They allow manipulating the otherwise very demanding basic properties of wood—e. g. its pronounced anisotropy, its tendency to uncontrollable warping—by forming new wooden parts from smaller wooden parts or particles. Thereby, also two-dimensional, plate-like wooden elements can be produced—a novelty in timber construction. Particularly solid-wood derivates have introduced profound changes in the way wood material is used in building constructions.
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Notes
- 1.
Natterer et al. (1980) Holzbau Atlas, p. 33 ff.
- 2.
cf. 7 www.fh-eberswalde.de.
- 3.
Scheidegger (1990) Aus der Geschichte der Bautechnik, p. 60 ff. and p. 172 ff.
- 4.
Scheer et al. (1984) Der Holzbau, p. 10.
- 5.
Nutsch et al. (2003) Holztechnik Fachkunde, p. 35.
- 6.
Neuhaus (1994) Lehrbuch des Ingenieurholzbaus, p. 78 ff. The maximum width of the press bed, which in turn determines the maximum height of a glulam truss, is 4 m. The maximum width of the beam planer that finally smooths the truss side surfaces is 2 m, whereby a 4 m high truss can also be passed through the planer twice. The maximum length of the press beds is over 50 m. Naturally, the maximum transport dimensions for road transport also apply. Note the maximum glulam cross-section width of (only) 28 cm, which results from the maximum width of a standard board lamella. Wider board lamellae are not available due to the dimensional restrictions of the regular tree trunk, the diameter of which is in the range of 32–36 cm (information from Dr. Ch Dehlinger).
- 7.
Mechanical presses, as used for the production of glulam, are not practical due to the large component lengths and widths of the panel-shaped cross-laminated timber (in contrast to the reduced widths of the rod-shaped glulam, which facilitate the application of the mechanical presses across the glulam component). For this reason, vacuum presses are used, i.e. enclosures made of rubber mats which, after pumping out the enclosed air, exert a two-dimensional compression on the cross-laminated timber as a result of atmospheric pressure. The pressures acting are correspondingly lower than with BSH. Therefore, other types of glues have to be used (PU glues), which foam up a little in the glue joint and for this reason do not require high compressing forces (information from Dr. Ch Dehlinger).
- 8.
Neuhaus (1994), p. 52; also: Pfeifer et al. (1998) Der neue Holzbau, p. 18; Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 5.
- 9.
Neuhaus (1994), p. 52 ff; also: Scheer et al. (1984), p. 35 ff, and Arbeitsgemeinschaft Holz e.V. (ed) (1997) Holzbau-Handbuch.
- 10.
Pfeifer et al. (1998) Der neue Holzbau, p. 16; Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 7.
- 11.
Pfeifer et al. (1998), p. 17; Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 4.
- 12.
Neuhaus (1994), p. 52; Pfeifer et al. (1998), p. 20 and 22; Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 9.
- 13.
Ibid., p. 8.
- 14.
Pfeifer et al. (1998), p. 23; also: Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 10.
- 15.
Pfeifer et al. (1998), p. 24; also: Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 11.
- 16.
Neuhaus (1994) Lehrbuch des Ingenieurholzbaus, p. 52.
- 17.
Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 15, p. 16.
- 18.
Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 12, p. 13.
- 19.
Pfeifer et al. (1998), p. 26.
- 20.
Neuhaus (1994), p. 52; also: Pfeifer et al. (1998), p. 27; Arbeitsgemeinschaft Holz e.V. (ed) (1997), p. 19.
- 21.
Götz et al. (1998) Holzbau-Atlas, p. 56 f.
- 22.
Ibid., p. 56 f.
- 23.
Ibid., p. 57 f; also: Pfeifer et al. (1998), p. 55.
- 24.
Götz et al. (1998), p. 57 f.
- 25.
Ibid., p. 57 f.
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Standards and Guidelines
EN 300: 2006-09 Oriented Strand Boards (OSB)—Definitions, classification and specifications
EN 309: 2005-04 Particleboards—Definition and classification
EN 312: 2010-12 Particleboards—Specifications
EN 316: 2009-07 Wood fibreboards—Definition, classification and symbols
EN 317: 1993-08 Particleboards and fibreboards; determination of swelling in thickness after immersion in water
EN 336: 2013-12 Structural timber—Sizes, permitted deviations;
EN 338: 2016-07 Structural timber—Strength classes
EN 384: 2019-02 Structural timber—Determination of characteristic values of mechanical properties and density
EN 408: 2012-10 Timber structures—Structural timber and glued laminated timber—Determination of some physical and mechanical properties
EN 622: Fibreboards—Specifications. (a) Part 1: 2003-09 General requirements. (b) Part 2: 2004-07 Requirements for hardboards. (c) Part 2 Corrigendum 1: 2006-06 Corrigenda to DIN EN 622-2. (d) Part 3: 2004-07 Requirements for medium boards. (e) Part 4: 2019-08 Requirements for softboards. (f) Part 5: 2010-03 Requirements for dry process boards (MDF)
EN 634: Cement-bonded particleboards—Specifications. (a) Part 1: 1995-04 General requirements. (b) Part 2: 2007-05 Requirements for OPC bonded particleboards for use in dry, humid and external conditions
EN 636: 2015-05 Plywood—Specifications
EN 844: 2020-01 Round and sawn timber—Terminology; Trilingual version
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EN 1611: Sawn timber—Appearance grading of softwoods. (a) Part 1: 2002-11 European spruces, firs, pines, Douglas firs and larches
EN 1912: 2013-10 Structural timber—Strength classes—Assignment of visual grades and species
EN 1927: Qualitative classification of softwood round timber. (a) Part 1: 2008-06 Spruces and firs. (b) Part 2: 2008-06 Pines. (c) Part 3: 2008-06 Larches and Douglas fir
EN 1995 Eurocode 5: Design of timber structures. (a) Part 1-1: 2010-12 General—Common rules and rules for buildings
EN 12775: 2001-04 Solid wood panels—Classification and terminology
EN 13017: Solid wood panels—Classification by surface appearance. (a) Part 1: 2001-03 Softwood. (b) Part 2: 2001-03 Hardwood
EN 13353: 2011-07 Solid wood panels (SWP)—Requirements
EN 13353: 2021-01 (prEN) Solid wood panels (SWP)—Requirements
EN 13354: 2009-02 Solid wood panels (SWP)—Bonding quality—Test method
EN 13377: 2002-11 Prefabricated timber formwork beams—Requirements, classification and assessment
EN 13986: 2015-06 Wood-based panels for use in construction—Characteristics, evaluation of conformity and marking
EN 14080: 2013-09 Timber structures—Glued laminated timber and glued solid timber—Requirements
EN 14081: Timber structures—Strength graded structural timber with rectangular cross section. (a) Part 1: 2019-10 General requirements. (b) Part 2: 2018-12 Machine grading; additional requirements for type testing. (c) Part 3: 2018-12 Machine grading; additional requirements for factory production control. (d) Part 3: 2019-11 (prEN) Machine grading; additional requirements for factory production control
EN 14250: 2010-05 Timber structures—Product requirements for prefabricated structural members assembled with punched metal plate fasteners
EN 14251: 2004-04 Structural round timber—Test methods
EN 14279: 2009-07 Laminated Veneer Lumber (LVL)—Definitions, classification and specifications
EN 14374: 2016-07 Timber structures—Structural laminated veneer lumber—Requirements
EN 15197: 2007-05 Wood-based panels—Flaxboards—Specifications
EN 15497: 2014-07 Structural finger jointed solid timber—Performance requirements and minimum production requirements
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CEN/TS 15679: 2008-03 (preliminary standard) Thermally Modified Timber—Definitions and characteristics
DIN 1052: Design of timber structures. (a) Part 10: 2019-12 Additional provisions
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Moro, J.L. (2024). Wood Products. In: Building-Construction Design - From Principle to Detail. Springer Vieweg, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-61742-7_21
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