EP2055852A1 - Balken auf Holzbasis, der eine wellenförmige Aussteifung als Schwingungsdämpfer enthält - Google Patents

Balken auf Holzbasis, der eine wellenförmige Aussteifung als Schwingungsdämpfer enthält Download PDF

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Publication number
EP2055852A1
EP2055852A1 EP08168015A EP08168015A EP2055852A1 EP 2055852 A1 EP2055852 A1 EP 2055852A1 EP 08168015 A EP08168015 A EP 08168015A EP 08168015 A EP08168015 A EP 08168015A EP 2055852 A1 EP2055852 A1 EP 2055852A1
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EP
European Patent Office
Prior art keywords
bastaing
bracing
beam according
section
fibers
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.)
Withdrawn
Application number
EP08168015A
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English (en)
French (fr)
Inventor
Christophe Henry
Jacky Heim
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.)
Woold Sas
Original Assignee
Woold Sas
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 Woold Sas filed Critical Woold Sas
Publication of EP2055852A1 publication Critical patent/EP2055852A1/de
Withdrawn legal-status Critical Current

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    • 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
    • E04C3/29—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures
    • E04C3/291—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces built-up from parts of different material, i.e. composite structures with apertured web

Definitions

  • the field of the invention is that of building materials. More specifically, the invention relates to wood-based beams comprising an inner bastaing and an outer bastaing between which extends a bracing.
  • metal frames comprising straight or curved beams consisting of upper and lower metal spars interconnected by a plurality of bracing metal cross members.
  • mixed wood / metal beams according to which there is used an inner face and an outer face of wood, interconnected by a metal bracing consisting of straight sections each extending obliquely from one side to the other. other of the beam, the sections being fixed on the lateral edges of the faces.
  • Such beams by their structure and design, have an inability curve forming.
  • a beam comprising an inner bastaing and an outer bastaing based on wood and having internal surfaces facing each other, a bracing extending between said inner and outer surfaces, characterized in that said bracing comprises at least one section undulating between said surfaces and having at least one support with each of said internal surfaces, said bracing being made of a material based on glass fibers and / or carbon.
  • the invention particularly aims to overcome this drawback of the prior art.
  • the object of the invention is to propose a wood-based beam of the type comprising an inner bastaing and an outer bastaing connected by an undulating bracing, which has a higher load resistance than the beams of the same type. prior art.
  • the invention also aims to provide such a beam which is optimized from the point of view of its weight / load bearing ratio.
  • the invention also aims to provide such a beam which has increased fire resistance.
  • a beam comprising an inner bastaing and a wood-based outer bastaing, said inner bastaing having an inner surface facing an inner surface outside bastaing, a wavy bracing between said internal faces so as to have a succession of support against said internal faces.
  • said bracing extends transversely between two edges having a longitudinal shape according to which, for each support of said bracing against said inner face of said outer bastaing, said edges extend from said support on said inner face of said outer bastaing , and on both sides of it, having a concave curvature with respect to said inner face of said inner bastaing.
  • the bracing of a beam according to the invention has corrugations whose longitudinal shape gives the bracing a damping power.
  • the behavior of the beam is brought to integrate a capacity to deform elastically.
  • This characteristic of the beam thus formed makes it possible to push back the limits of withstanding load, and also to dampen the effect of the stresses, this reversibly, the beam returning to its initial state after disappearance of the stresses.
  • Such behavior is particularly advantageous in a situation of seismic shaking.
  • said bracing has, over at least a portion of its length, a profiled cross section having at least one relief between said borders.
  • a beam according to the invention has an increased load resistance compared to the beams of the same type of the prior art.
  • the profiled cross section of the brace gives it greater rigidity than that obtained with an undulating bracing having a flat section over its entire length.
  • the Applicant has measured that the load resistance of a beam according to the invention is increased to about 4 t on a center distance of 2 m, whereas as mentioned above, a beam of the same type whose bracing has a flat section. withstands maximum loads of the order of 1 t.
  • this increase in rigidity is combined with a damping capacity and / or stress diffusion so that the beam, even loaded to the limits of its resistance , returns to its original state (excluding load).
  • said bracing has a flat cross section at said supports, said bracing having, between two supports, a portion having said profiled cross section.
  • the bracing has, at each of the supports, a contact portion having an optimized surface to promote a reliable connection with the corresponding bastaing.
  • said profiled cross section has two opposite flat edges parallel to each other, and between which extends a relief having a plate extending in a plane substantially perpendicular to said borders.
  • said bracing has, for at least one end of said beam, a closed body whose surface bears against said inner surface of said inner bastaing and a surface bears against said inner surface of said bastaing outside.
  • Such a closed body, preferably at each end of the brace effectively contributes to improving the performance of a beam according to the invention.
  • the beam advantageously comprises longitudinal wedging means of said closed body or bodies, said wedging means preferably comprising two spacers extending between said inner surfaces of the inner and outer bastaings, and leaving between them a median space intended to form a housing for a fastener of said beam to a building.
  • said bracing is made of a material based on glass fibers and / or carbon and / or linen, said bracing preferably comprising at least one inner layer in which the fibers are oriented according to the longitudinal axis of said beam, and at least one outer layer on either side of said inner layer, wherein the fibers are crossed with each other and oriented at angles of about + 45 ° and about -45 ° ° with respect to said fibers of said at least one inner layer.
  • a brace thus constituted contributes to spreading the forces exerted on the beam and, consequently, to increase the resistance thereof.
  • said inner bastaing and / or said outer bastaing comprise at least three layers including an intermediate layer between the two others, said intermediate layer having a lower density than the other two of said layers.
  • said intermediate layer is preferably made in a low-density wood, the other two of said layers being made of a high-density wood and / or glued-laminated veneer sheets.
  • At least said inner bastaing has a cross section of substantially trapezoidal shape in which the external surface opposite to said inner surface has a length less than that of said inner surface.
  • the inner bastaing has improved strength of its first fiber, pushing the limits to breaking it.
  • the shape thus conferred to the bastaing allows, in case of fire, to direct the flames to the lateral ends of the bastaing, which tends to delay the calcination of the first exposed fiber bastaing and, therefore, gives him a greater fire resistance.
  • said bracing is secured to said inner surfaces of said inner and outer bastaings using a flexible glue and fixing means by bolting and / or riveting.
  • Such a feature is part of the general approach of the invention that seeks to increase the strength of the beam while introducing into it a degree of flexibility (rather than increasing its rigidity) thus contributing to improve the ability to dampen and / or diffuse the stresses that are exerted on the beam.
  • the principle of the invention is to improve the load resistance of a beam consisting of two bastaings connected by an undulating bracing, this providing a damping capacity bracing.
  • the inner bastaing 1 and the outer bastaing 2 respectively have internal surfaces 11, 21 facing each other and between which the corrugating bracing 3 extends and is secured to the inner and outer bastings in a succession of supports against said internal surfaces.
  • a laminated wood material allows to maintain a unit of fibers over the entire length of the corresponding bastaing.
  • outer bastaing may also have such a section, parallel to that of the inner bastaing, that is to say with a substantially trapezoidal shape that tapers from the inner surface towards the outer surface.
  • the vertices 31 and 32 constitute flattened portions of the undulating bracing, the bearing surface between the internal surfaces of the bastaings thus providing a relatively large contact surface (compared to the contact area that would be offered by a top of a portion curvature curve).
  • the bracing 3 is mechanically connected to the inner and outer bastaings by means of a bolted (or riveted) connection, the surfaces offered by the vertices 31 and 32 being furthermore glued to the inner surface corresponding to the using a high elasticity glue such as a polyurethane glue hardness shore 40.
  • the bracing 3 extends transversely between two edges 30 ( figure 5 ) having a longitudinal shape according to which, for each support of the brace against the inner surface of the outer bastaing, that is to say for each vertex 32, the edges 30 extend from the top 32, and on both sides thereof, having a concave curvature relative to the inner surface 11 of the inner bastaing.
  • the portions 300 have a curved shape towards the outside of the space E, in the sense of a concavity seen from the inside of the space E.
  • the space E (and each of the other spaces E as defined above) have an axis of symmetry S passing through the middle of the vertex 32.
  • the portions 300 have a radius of curvature R of the order of 230 cm.
  • the spaces E 'alternating with the spaces E as defined previously have in turn a profile according to which the portions 300 have a convex convex shape seen from the inside of the space E '.
  • Bracing constituted such as just described can significantly increase the performance of a beam according to the invention incorporating such bracing.
  • the portions 300 give the beam damping capabilities, this by constituting a plurality of elastically deformable zones whose direction of bending is predefined.
  • a beam according to the invention can thus absorb significant stresses in bending, or even in compression, because of the power of the brace to deform, thereby absorbing part of the forces and recovering its initial state once the efforts cease to be exerted on the beam.
  • each portion 300 of the brace acts as a leaf spring.
  • a brace whose portions 300 are curved with a radius of curvature of the order of 230 cm deforms elastically under the effect of loads of the order of 2 t, and up to 4 t.
  • This damping capacity of the beam through the bracing is combined with an increase in rigidity, in particular in torsion, of the bracing.
  • the bracing has, over at least a portion of its length, a profiled cross section having at least one relief between said edges.
  • the borders 30 constitute in the present embodiment of the fallen edges which contribute to increase the rigidity of the bracing (this being combined recall it with the damping power of the bracing).
  • cross section of the brace 3 may have other shapes according to other possible embodiments.
  • the bracing may have a section of corrugated shape such as that illustrated by the figure 6 .
  • the bracing has a profiled section incorporating a relief only in the portions 300 of the brace extending between the vertices 31, 32.
  • the parts of the brace corresponding to the vertices 31 and 32 are themselves formed to have a flat section.
  • the closed body 310 bears against the inner surface 11 of the inner bastaing 1 via the top 31, and in contact with the inner surface 21 of the outer bastaing 2 via the second return 312.
  • wedging means 4 are positioned at the ends of the beam and are provided to form a stop against which the closed body 310 of the brace bears.
  • the wedging means 4 comprise two spacers extending between the inner surfaces of the inner and outer battens. These spacers are spaced from each other so as to provide a median space for forming a housing for a fastener 5 (shown in dashed lines) ensuring the attachment of the beam to a building (usually a wall).
  • the fastening of the beam to the element of fixing is carried out by bolting through orifices formed in the fastening element 5 positioned in correspondence with orifices formed in the spacers 4.
  • the spacers 4 are pieces made of glulam. They are spaced apart by a distance of about 5 to 10 mm.
  • the first return 311 of the closed body 310 is glued to the spacers with a flexible glue, while the spacers 4 are glued to the inner bastaing and outer bastaing using a rigid glue.
  • the closed body is a piece attached to the end of the brace, such as that illustrated by the figure 13 .
  • the body 310 thus comprises a portion 313 corresponding to the lower half of a portion 300 (the brace ending therefore with a truncated portion in correspondence), a portion corresponding to a vertex 31, a first return 311 and a second return 312.
  • This part is made of glass fibers, the fibers having an orientation at 45 ° with respect to the longitudinal axis of the beam. It is attached and glued to the end of the brace using an epoxy glue.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Rod-Shaped Construction Members (AREA)
EP08168015A 2007-10-31 2008-10-31 Balken auf Holzbasis, der eine wellenförmige Aussteifung als Schwingungsdämpfer enthält Withdrawn EP2055852A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0707655A FR2922920A1 (fr) 2007-10-31 2007-10-31 Poutre a base de bois comprenant un contreventement ondulant formant amortisseur

Publications (1)

Publication Number Publication Date
EP2055852A1 true EP2055852A1 (de) 2009-05-06

Family

ID=39512649

Family Applications (1)

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EP08168015A Withdrawn EP2055852A1 (de) 2007-10-31 2008-10-31 Balken auf Holzbasis, der eine wellenförmige Aussteifung als Schwingungsdämpfer enthält

Country Status (2)

Country Link
EP (1) EP2055852A1 (de)
FR (1) FR2922920A1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH245601A (de) * 1945-03-15 1946-11-30 Zuern Erwin Als Träger oder Bewehrung für Betonbalken verwendbares Eisenelement.
GB1286122A (en) * 1969-09-03 1972-08-23 Stimber Lite Sales Private Ltd Truss construction
WO1998010157A1 (en) * 1996-09-03 1998-03-12 Weyerhaeuser Company Engineered structural wood product and method for its manufacture
WO1998059128A1 (en) * 1997-06-25 1998-12-30 Eco-Beam Technologies (Proprietary) Limited Load bearing components and a method of building
EP1582324A1 (de) * 2004-04-01 2005-10-05 Christopher P. Mroz Sinusförmiges steifes Band
FR2870867A1 (fr) 2004-05-27 2005-12-02 Woold Sas Soc Par Actions Simp Poutre a base de bois comprenant un contreventement ondulant

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH245601A (de) * 1945-03-15 1946-11-30 Zuern Erwin Als Träger oder Bewehrung für Betonbalken verwendbares Eisenelement.
GB1286122A (en) * 1969-09-03 1972-08-23 Stimber Lite Sales Private Ltd Truss construction
WO1998010157A1 (en) * 1996-09-03 1998-03-12 Weyerhaeuser Company Engineered structural wood product and method for its manufacture
WO1998059128A1 (en) * 1997-06-25 1998-12-30 Eco-Beam Technologies (Proprietary) Limited Load bearing components and a method of building
EP1582324A1 (de) * 2004-04-01 2005-10-05 Christopher P. Mroz Sinusförmiges steifes Band
FR2870867A1 (fr) 2004-05-27 2005-12-02 Woold Sas Soc Par Actions Simp Poutre a base de bois comprenant un contreventement ondulant

Also Published As

Publication number Publication date
FR2922920A1 (fr) 2009-05-01

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