EP2090413B1 - Poutre de bois stratifié collé - Google Patents

Poutre de bois stratifié collé Download PDF

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Publication number
EP2090413B1
EP2090413B1 EP08151457A EP08151457A EP2090413B1 EP 2090413 B1 EP2090413 B1 EP 2090413B1 EP 08151457 A EP08151457 A EP 08151457A EP 08151457 A EP08151457 A EP 08151457A EP 2090413 B1 EP2090413 B1 EP 2090413B1
Authority
EP
European Patent Office
Prior art keywords
adhesive
adhesive interface
strip
interface
height
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP08151457A
Other languages
German (de)
English (en)
Other versions
EP2090413A1 (fr
Inventor
Maurice Brunner
Marc Donzé
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ed Geistlich Soehne AG fuer Chemische Industrie
Original Assignee
Ed Geistlich Soehne AG fuer Chemische Industrie
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ed Geistlich Soehne AG fuer Chemische Industrie filed Critical Ed Geistlich Soehne AG fuer Chemische Industrie
Priority to SI200830587T priority Critical patent/SI2090413T1/sl
Priority to EP08151457A priority patent/EP2090413B1/fr
Priority to AT08151457T priority patent/ATE538911T1/de
Publication of EP2090413A1 publication Critical patent/EP2090413A1/fr
Application granted granted Critical
Publication of EP2090413B1 publication Critical patent/EP2090413B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
    • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
    • B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
    • B27M3/0026—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally
    • B27M3/0053—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally using glue

Definitions

  • the invention is concerned with a glued laminated timber beam, according to the preamble of claim 1.
  • a beam is known from US 20020015819 A .
  • EP 1 586 430 discloses a structural member constructed of a plurality of wood strips glued together wherein a layer of adhesive is provided between every two adjacent wood strips.
  • the advantage of the said glued laminated timber beams or in short glulam beams is the improvement of the load-bearing behavior of such a structural beam.
  • Fig. 1 shows according to the prior art a schematic elevation of the arrangement of a beam 10 according to the invention over two spans.
  • the beam 10 comprises two parts 11 and 12 which are shown with their specific dimensions in Fig. 2 .
  • Beam 10 has a length allowing its use on two columns or walls 20 having a predetermined distance. Such a distance can be chosen between e.g. 5 and 25 meters.
  • the beam 10 is arranged on the upper section of the wall or column 20. Beam 10 may extend beyond the wall 20 but is not supported in said section. In other words, only the portions shown in Fig. 1 are used for the simply supported beam.
  • Reference signs in Fig. 2 relate to the dimensions of the beam 10.
  • the width b of the beam 10 is e.g. between 5 and 30 centimeters.
  • the height of the beam 10 has received the reference sign h and can especially be chosen between 10 and 100 centimeters. In exceptional cases heights of over 1 meter may be possible.
  • Said beam 10 comprises a lower thinner strip 12 and an upper major strip 11. The height of the lower strip is h 1 .
  • the two wood strips 11 and 12, i.e. the main beam portion 11 and the thinner wood strip 12, are joined using an adhesive having the properties of the adhesive disclosed and used in EP 1 586 430 .
  • the adhesive for the adhesive interface 13 is preferably an adhesive showing a specific stiffness k/b, i.e. the stiffness k [N/mm 2 ] in relation to the width of the beam being covered by the adhesive b [e.g. 100 mm], depending on the relation L/h, i.e. free span length L of the beam 10 over the height h of the beam, L/h being usually between 15 and 25.
  • a preferred value of k/b is 0.3 for a value of L/h of around 20.
  • a specific preferred shear modulus of the adhesive is between 40 and 80 N/mm, especially between 50 and 70 N/mm and one embodiment was tested with an adhesive having a shear modulus of 60 N/mm.
  • Fig. 3 shows a different beam according to the prior art wherein the lower beam portion 12 is made out of two separate wood strips 21 and 22.
  • the height of the two strips is h 1 and h 2 , respectively.
  • the sum of h 1 and h 2 is according to preferred embodiment almost equivalent to the height h 1 of the single wood strip of the embodiment according to Fig. 2 .
  • the adhesive interfaces 13 are identical to the single adhesive interface 13 of Fig. 1 .
  • the said improvement of about 20% of the bending resistance behavior may result in a loss of rigidity of about 20% as compared to conventional glulam.
  • this product fails at a deformation increase of about 50%.
  • Said results allows to use such an improved beam where a greater charge has to be accepted and in cases where a greater deformability is desired.
  • Such beams are therefore especially suitable for the construction of bridges and/or constructions of roofs of all kind of halls. This is especially true for constructions in earthquake endangered areas.
  • the invention is related to a beam according to Fig. 4 , showing a schematic side view of a two-span beam according to the invention.
  • the glued laminated timber beam 10 of Fig. 4 comprises one beam body 11 and one (or two) adjacent strip (s) 31, separated by different sections of an adhesive interface 32 and 33 as explained below, wherein the height of the adjacent strip(s) 31 is between 15 and 25% of the height of the entire beam 10.
  • the beam according to Fig. 4 is intended to be used in connection with a continuous beam of two or more spans, i.e. using side walls or columns 20 and one or more intermediate supporting portions 25.
  • Fig. 4 only shows one intermediate supporting portion 25, but the beam 10 can also be supported at two or more intermediate positions and this has an influence on the adhesive interfaces 32 and 33.
  • Fig. 4 shows a schematic view of these interfaces 32 and 33.
  • the beam 10 is positioned with its main body 11 on the supporting elements 20 and 25.
  • the additional wood strip 31 is provided on the opposite side.
  • the additional wood strip 31 is glued on the main body according to the same principles as shown in connection with the embodiments of Fig. 1 to 3 , i.e. using an adhesive interface 33 allowing for a gliding connection, and, possibly, use of a so called elastic adhesive with a shear modulus between 40 and 80 N/mm.
  • the length of the interface 33 stretches over an area between 1/10 and 1/3 of the span on both sides of the intermediate columns 25: thus each stretch has a total length of 2/10 - 2/3 of the span.
  • the reminder of the adhesive interface 32 is a conventional rigid interface, especially using a rigid adhesive or a thinner glue layer. This is represented by the dotted line.
  • a rigid adhesive Mirapur 9521 from Geistlich Ligamenta can be used, being an adhesive on polyurethane prepolymer basis.
  • Said reinforcement of the beam body 11 on the upper side reflects the different loading of a two-span beam construction, which suffers smaller shear stresses at midspan, whereas the greater shear stresses are concentrated in the areas directly over the supports.
  • Fig. 5 shows a perspective view of an embodiment similar to Fig. 4 showing a continuous slab 100 according to the invention.
  • the slab 100 comprises a lower sheet 11 and a cover sheet 31 (not distinguished in Fig. 5 ), wherein the adhesive interface 33 is provided and schematically shown between said elements 11 and 31 in a region over the intermediate wall 25.
  • the width of the adhesive interface 33 is preferably three to seven times the width of the intermediate wall 25.
  • Fig. 6 shows a schematic view of a slab 100 on columns 125 according to a further embodiment of the invention.
  • the nine columns 125 are provided under the slab 100, which is positioned in a way that the adhesive surface 133 is centered on the columns.
  • the adhesive surface 133 is circular or square and has a width between covers an area of between 1/10 to 1/3 of the span on both or all of the supporting columns 25.
  • the adhesive surface 133 corresponds to the areas 33 of the embodiment of Fig. 4 and 5 , e.g. either provided within a recess of e.g. 0.5 to 1 millimeter within the body 11 of the slab 100 to create a room for a thicker glue layer in comparison to the interfaces 32, thus realizing the shear modulus as requested for.
  • the surfaces beside the illustrated surfaces 133 are the conventional rigid adhesive interface areas.
  • a ductile adhesive as mentioned in EP 1 586 430 , having an initial shear modulus of about 500 to 1000 N/mm for a range up to e.g. 0.1 to 0.3 millimeters. Said length provides a threshold value. For lengths beyond said threshold value the shear modulus becomes very small, e.g. changes to a value below 10 N/mm. Therefore an almost constant force between e.g. 100 and 200 N is available for additional lengths, i.e. it is possible to use an adhesive showing the properties according to Fig. 4 of EP 1 586 430 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Rod-Shaped Construction Members (AREA)

Claims (9)

  1. Poutre (10) en bois laminé collé, comprenant un corps de poutre (11) et une ou deux bandes (12) adjacentes, chacune séparée par une interface adhésive (13),
    caractérisée en ce que
    la hauteur de la ou des bandes (31) est comprise entre 15 et 25 % de la hauteur (h) de la poutre (10),
    en ce que la bande ou les bandes (31) présentent la même largeur (b) que le corps de poutre (11) et
    en ce que la bande adjacente (31) est collée sur le corps principal en utilisant une interface adhésive (33) permettant un raccordement de glissement et une interface adhésive (32) utilisant un adhésif rigide.
  2. Poutre (10) selon la revendication 1, dans laquelle la ou les bandes adjacentes (12 ; 21, 22) sont constituées du même bois que le corps de poutre (11).
  3. Poutre (10) selon la revendication 1 ou 2, dans laquelle le module de cisaillement de l'adhésif permettant le raccordement de glissement est compris entre 40 et 80 N/mm et plus particulièrement entre 50 et 70 N/mm.
  4. Poutre (10) selon la revendication 1 ou 2, dans laquelle le module de cisaillement de l'adhésif permettant le raccordement de glissement présente une valeur comprise entre 500 et 1 000 N/mm dans une plage allant jusqu'à une valeur de seuil comprise entre 0,1 et 0,3 millimètres et passe ensuite essentiellement à une valeur inférieure à 10 N/mm pour une longueur supérieure à ladite valeur de seuil.
  5. Poutre (100) selon l'une quelconque des revendications 1 à 4, destinée à être utilisée en tant que travée multiple et spécialement en tant que poutre à double travée, dans laquelle la poutre peut être positionnée avec sa bande (31) située sur le côté opposé des éléments (20) de support et en particulier du ou des éléments (25, 125) de support intermédiaires.
  6. Poutre (100) selon l'une quelconque des revendications 1 à 4 et selon la revendication 6, dans laquelle l'interface adhésive (33, 133) qui peut être placée face à tout élément (25, 125) de support intermédiaire utilise un adhésif dont le module de cisaillement est compris entre 40 et 80 N/mm et plus particulièrement entre 50 et 70 N/mm.
  7. Poutre (100) selon la revendication 6 ou 7, dans laquelle la largeur de l'interface adhésive (33, 133) qui peut être placée face à tout élément (25, 125) de support intermédiaire couvre une surface comprise entre 1/10 et 1/3 de la portée sur les deux ou sur toutes les colonnes (25, 125) de support.
  8. Poutre (100) selon l'une quelconque des revendications 6 à 8, dans laquelle l'interface adhésive (33, 133) qui peut être placée face à tout élément (25, 125) de support intermédiaire est placée dans un creux, plus particulièrement dans un creux profond de 0,5 à 1 millimètre agencé dans le corps de la poutre (100).
  9. Poutre (100) selon l'une quelconque des revendications 6 à 9, dans laquelle on prévoit à l'extérieur de la surface adhésive (33, 133) une couche de colle plus fluide constituée du même adhésif que dans l'interface adhésive (33, 133).
EP08151457A 2008-02-14 2008-02-14 Poutre de bois stratifié collé Active EP2090413B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SI200830587T SI2090413T1 (sl) 2008-02-14 2008-02-14 Lepljen lameliran tram
EP08151457A EP2090413B1 (fr) 2008-02-14 2008-02-14 Poutre de bois stratifié collé
AT08151457T ATE538911T1 (de) 2008-02-14 2008-02-14 Geleimter und beschichter holzbaken

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08151457A EP2090413B1 (fr) 2008-02-14 2008-02-14 Poutre de bois stratifié collé

Publications (2)

Publication Number Publication Date
EP2090413A1 EP2090413A1 (fr) 2009-08-19
EP2090413B1 true EP2090413B1 (fr) 2011-12-28

Family

ID=39345295

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08151457A Active EP2090413B1 (fr) 2008-02-14 2008-02-14 Poutre de bois stratifié collé

Country Status (3)

Country Link
EP (1) EP2090413B1 (fr)
AT (1) ATE538911T1 (fr)
SI (1) SI2090413T1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020015819A1 (en) * 2000-06-09 2002-02-07 Edwards Christopher M. Fiber-reinforced thermoplastic composite bonded to wood

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1095100B (it) * 1978-06-07 1985-08-10 Alpi Pietro & Figlio & C S A S Piastrella composita in materiale ceramico con strato di rivestimento incollato
US5755068A (en) * 1995-11-17 1998-05-26 Ormiston; Fred I. Veneer panels and method of making
DE10225727A1 (de) * 2002-06-11 2004-01-08 Franz Storek Fertigparkett-Diele
WO2004018798A2 (fr) * 2002-08-19 2004-03-04 Peter Kellner Plancher constitue d'elements individuels
ATE367905T1 (de) 2004-02-26 2007-08-15 Geistlich Soehne Ag Aus holzlamellen aufgebautes tragelement
AT8982U1 (de) 2005-05-02 2007-03-15 Holzindustrie Leitinger Ges M Balkenbinder aus holz

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020015819A1 (en) * 2000-06-09 2002-02-07 Edwards Christopher M. Fiber-reinforced thermoplastic composite bonded to wood

Also Published As

Publication number Publication date
ATE538911T1 (de) 2012-01-15
SI2090413T1 (sl) 2012-05-31
EP2090413A1 (fr) 2009-08-19

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