EP0575268A1 - Baumaterial aus geschichtetem und verleimtem Holz - Google Patents

Baumaterial aus geschichtetem und verleimtem Holz Download PDF

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Publication number
EP0575268A1
EP0575268A1 EP93420246A EP93420246A EP0575268A1 EP 0575268 A1 EP0575268 A1 EP 0575268A1 EP 93420246 A EP93420246 A EP 93420246A EP 93420246 A EP93420246 A EP 93420246A EP 0575268 A1 EP0575268 A1 EP 0575268A1
Authority
EP
European Patent Office
Prior art keywords
glued
layer
laminated
bending
vertical direction
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.)
Granted
Application number
EP93420246A
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English (en)
French (fr)
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EP0575268B1 (de
Inventor
Jean-Luc Sandoz
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.)
Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0575268A1 publication Critical patent/EP0575268A1/de
Application granted granted Critical
Publication of EP0575268B1 publication Critical patent/EP0575268B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
    • E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
    • E04C3/14—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with substantially solid, i.e. unapertured, web

Definitions

  • the present invention relates to a new type of wooden material of the glued laminated type, material which in the following description, will be designated by the expression "beam”.
  • Wood as a building material, has the distinction of having a very wide variability in its mechanical properties since it is a natural material. These properties are influenced, within each species, by geo-climatic parameters, by silvicultural data, or by transformation characteristics. In addition, the products derived from its transformation are limited in their geometry and in their volume. Lumber products rarely have a length of more than ten meters, with maximum sections of the order of 180/300 cm, which therefore limits the field of use of such a product.
  • the lower values of resistance and modulus of deformation, obtained by destructive sampling tests adapted, are considered as reference. Almost unanimously, and for the resistance values, the 5% fractile (value for which 5% of the parts tested have lower characteristics), is the reference data. This 5% fractile is associated with an implementation safety factor (s). The quotient 5% fractile divided by the safety coefficient, (s), gives the admissible resistance values, usable by the specialist for the sizing of the structure (framework for example).
  • Such an operating system is therefore highly dependent on the lowest resistance values, without exploiting the existence of higher values.
  • a factor of about eight, between the lowest resistances and the highest resistances is usual.
  • Such variability therefore results in being able to sort or classify the woods according to the characteristics it exhibits.
  • the oldest method consists in carrying out a classification by simple visual control, which obviously gives very poor results.
  • non-destructive checks such as for example ultrasound or bending control, which makes it possible to obtain much better results.
  • the solution proposed according to the invention makes it possible to solve this problem of improving the resistance of the beams by the fact that a reinforcement is obtained while keeping the initial rectangular section, without adding material.
  • the material according to the invention comprises a single layer of glued laminated, thus glued in the vertical direction, the other layers being made of lamellas glued in the horizontal direction, according to a conforming variant according to the invention, a second layer of glue-laminate added in the vertical direction can be placed at the top.
  • the whole of the material according to the invention is made up entirely of layers of glulam arranged vertically and joined together by gluing.
  • the layer of glulam arranged in the vertical direction must comprise at least three to four elementary blades, to benefit from the effect of redistribution of the stresses of the blade the lowest locally on the adjacent vertical blades (parallel effect), the increase in the number of vertical blades making it possible to decrease the variability of resistance of the beams produced, and therefore to increase their reliability.
  • Figures 1, 2 and 3 illustrate, schematically, the three embodiments of a glued laminated wood building material produced in accordance with the invention.
  • such a beam consists of a conventional glued-laminated assembly (1), consisting of eleven parallel layers arranged horizontally and, glued in a vertical direction, a layer (2) d '' a glued laminate comprising five lamellae and arranged in the most stretched zone, and therefore oriented in the direction in which the bending is exerted.
  • the material according to the invention is in the form of a beam also of rectangular section, consisting in its central part of a conventional glued laminated (1) comprising ten horizontal layers and, located on either side of this central area (1), of two layers (2) of glued laminated, glued vertically, and each consisting of five strips.
  • the coefficient of variation, standard deviation ratio on average, of the supply wood (the stop blades) is 25% for example, the coefficient of variation of conventional glued laminated timber will be from 18 to 20%, and that of the wood produced in accordance with the invention of the order of 10 to 13%.
  • the reduction in this variability is directly linked to the gain in reliability and thus makes it possible to increase the resistance values used by specialists for the dimensioning of structures.
  • Such a design makes it possible to obtain beams having admissible resistance values greater than 30 to 40% compared to beams produced in conventional glulam.
  • the mechanical quality of the beam is further optimized by sorting the best blades which are preferably intended for vertical blades.
  • the material according to the invention it is advisable to have at least three to four blades in the glued laminated element arranged vertically in the stretched area.
  • blades of approximately 25 mm thickness for example to produce the element placed in the stretched area.
  • conventional blades 33 mm thick or more are suitable.
  • the reduction in thickness of the strips of the multi-bonded element disposed in the stretched area is an optimization parameter in the sense that it increases the number of vertical strips and thus reduces the variability of beam resistance.
  • the product according to the invention has another advantage which is that the mechanical values which result therefrom are valid for all sections. If the height of the section increases, within the framework of a conventional glued laminated product, reducing coefficients intervene to reduce the admissible values, taking in this sense into account negative volume effects on the resistance of the beam (case of all serial systems). With the product according to the invention, there is no volume effect, provided that the element placed in the stretched area represents at least 15% of the section.
  • Such a material can be produced from all types of wood and according to conventional lamination techniques, techniques which will therefore not be described for the sake of simplification.
  • the mechanical properties of the beam will be deduced from the properties of the supply woods (fir, spruce, pine, larch, etc.).

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Rod-Shaped Construction Members (AREA)
  • Panels For Use In Building Construction (AREA)
  • Laminated Bodies (AREA)
  • Finishing Walls (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP93420246A 1992-06-16 1993-06-15 Baumaterial aus geschichtetem und verleimtem Holz Expired - Lifetime EP0575268B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9207544A FR2692301B1 (fr) 1992-06-16 1992-06-16 Materiau de construction a base de bois lamelle-colle.
FR9207544 1992-06-16

Publications (2)

Publication Number Publication Date
EP0575268A1 true EP0575268A1 (de) 1993-12-22
EP0575268B1 EP0575268B1 (de) 1998-03-25

Family

ID=9430982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93420246A Expired - Lifetime EP0575268B1 (de) 1992-06-16 1993-06-15 Baumaterial aus geschichtetem und verleimtem Holz

Country Status (4)

Country Link
EP (1) EP0575268B1 (de)
AT (1) ATE164412T1 (de)
DE (1) DE69317600T2 (de)
FR (1) FR2692301B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1015492A5 (fr) 2002-09-27 2005-05-03 Ronveaux E Ets Sa Poutre composite en bois lamellee collee.
WO2025251107A1 (en) * 2024-06-07 2025-12-11 The University Of Melbourne Timber structural member, assembly, reinforcing member and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0939177B1 (de) 1998-02-26 2004-01-14 Kaufmann Holz AG Balkenartige Schwelle für Holzständerbaukonstruktionen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118048A (en) * 1937-03-29 1938-05-24 Timber Engineering Co Laminated structure
DE897622C (de) * 1946-09-07 1953-11-23 Gottfried Kaempf Verleimter Holztraeger
US2886857A (en) * 1953-12-14 1959-05-19 Hyresgaesternas Sparkasse Och Wooden beam constructions
DE1103551B (de) * 1957-08-26 1961-03-30 Josef Wolff Holztraeger mit mindestens drei miteinander verleimten Stegschichten
US3170198A (en) * 1960-06-22 1965-02-23 Eliot I Snider Wooden i-beam
US3445325A (en) * 1966-08-22 1969-05-20 Us Agriculture Laminated wood beam with improved preservative treatment
DE1609898B1 (de) * 1965-08-18 1971-03-25 Wiesner Erich Dr Techn Dipl In Stossausbildung fuer hoelzerne Hallentraeger od.dgl.aus verleimten Lamellen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2118048A (en) * 1937-03-29 1938-05-24 Timber Engineering Co Laminated structure
DE897622C (de) * 1946-09-07 1953-11-23 Gottfried Kaempf Verleimter Holztraeger
US2886857A (en) * 1953-12-14 1959-05-19 Hyresgaesternas Sparkasse Och Wooden beam constructions
DE1103551B (de) * 1957-08-26 1961-03-30 Josef Wolff Holztraeger mit mindestens drei miteinander verleimten Stegschichten
US3170198A (en) * 1960-06-22 1965-02-23 Eliot I Snider Wooden i-beam
DE1609898B1 (de) * 1965-08-18 1971-03-25 Wiesner Erich Dr Techn Dipl In Stossausbildung fuer hoelzerne Hallentraeger od.dgl.aus verleimten Lamellen
US3445325A (en) * 1966-08-22 1969-05-20 Us Agriculture Laminated wood beam with improved preservative treatment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1015492A5 (fr) 2002-09-27 2005-05-03 Ronveaux E Ets Sa Poutre composite en bois lamellee collee.
WO2025251107A1 (en) * 2024-06-07 2025-12-11 The University Of Melbourne Timber structural member, assembly, reinforcing member and method

Also Published As

Publication number Publication date
EP0575268B1 (de) 1998-03-25
DE69317600T2 (de) 1998-07-09
FR2692301B1 (fr) 1999-01-15
ATE164412T1 (de) 1998-04-15
DE69317600D1 (de) 1998-04-30
FR2692301A1 (fr) 1993-12-17

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