Laminated sectional girder of fiber-reinforced materials

• US 4,177,306 A
• Filed: 05/12/1977
• Issued: 12/04/1979
• Est. Priority Date: 05/19/1976
• Status: Expired due to Term

• Current Assignee: Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung
• Original Assignee: Messerschmitt-Bolkow-Blohm Gesellschaft Mit Beschrankter Haftung
• Inventors: Schulz, Ralf-Thilo, Brunsch, Klaus, Lemmer, Ludwig
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Thibodeau, P.
• Application Number:
  US05/796,414
• Time in Patent Office: 936 Days
• Field of Search: 428/105, 428/112, 428/113, 428/245, 428/260, 428/114, 428/119, 428/120, 428/367, 428/408, 428/295, 428/107, 52/729-731, 52/209.1, 264/DIG. 29
• US Class Current: 428/107
• CPC Class Codes: B29C 43/12 using bags surrounding the moulding material or using membranes contacting the moulding material
• CPC Class Codes: B29C 70/085 the structure being deformed in a three dimensional configuration B29C53/805 takes precedence
• CPC Class Codes: B29C 70/304 In-plane lamination by juxtaposing or interleaving of plies, e.g. scarf joining
• CPC Class Codes: B29C 70/44 using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
• CPC Class Codes: B29C 70/446 Moulding structures having an axis of symmetry or at least one channel, e.g. tubular structures, frames
• CPC Class Codes: B29D 99/0003 Producing profiled members, e.g. beams
• CPC Class Codes: E04C 3/29 built-up from parts of different material, i.e. composite structures
• CPC Class Codes: Y10T 428/24074 Strand or strand-portions
• CPC Class Codes: Y10T 428/24116 Oblique to direction of web
• CPC Class Codes: Y10T 428/24124 Fibers
• CPC Class Codes: Y10T 428/24132 including grain, strips, or filamentary elements in different layers or components parallel
• CPC Class Codes: Y10T 428/24174 including sheet or component perpendicular to plane of web or sheet
• CPC Class Codes: Y10T 428/24182 Inward from edge of web or sheet
• CPC Class Codes: Y10T 428/249924 Noninterengaged fiber-containing paper-free web or sheet which is not of specified porosity

Abstract

Laminated sectional girders having webs and flanges may be formed to incre the shear stresses thereof by including as a structural part of the girder at least one connecting layer extending through both the flanges and webs of the girder and made of prefabricated sections with additional girder layers being arranged adjacent the sections of the connecting layer. The additional adjacent layers may comprise both fiber-reinforced material layers forming the laminated flanges of the girder as well as the webs thereof. The additional layers may be arranged either between prefabricated sections of the connecting layer or they may be arranged outside of the prefabricated sections.

Claims

1. In a longitudinal laminated construction girder consisting of at least one web portion and at least one flange portion, said web and flange portions extending transversely to each other, with each being formed of a plurality of layers, each of said layers consisting essentially of a fiber reinforced structure formed of thermosetting-resin-impregnated fibers, the improvement comprising:

that both said web and flange portions are each structured to consist of at least three of said layers;

that said layers include at least two connecting layers which extend through both said web and flange portions;

that said connecting layers are constructed with crossing fiber applications which include fibers extending at an angle transversely to the longitudinal direction of said girder; and

that said at least one flange portion includes at least one flange layer which extends exclusively through said flange portion and is located between said at least two connecting layers extending through said flange portion;

said at least one flange layer being structured to include unidirectional fiber applications which extend parallel to said longitudinal direction of said girder.

2. The improvement according to claim 1 wherein said transversely extending fibers of said connecting layers extend at an angle of ±

45°

relative to the longitudinal direction of said girder.

3. The improvement according to claim 1 wherein said at least one web portion includes at least one web layer provided between said connecting layers extending through said web portion, said web layer being located to extend exclusively in said web portion.

4. The improvement according to claim 3 wherein said at least one web layer is provided with crossing fiber applications which are arranged to extend at an angle of ±

45°

relative to the longitudinal direction of said girder.

5. The improvement according to claim 1 wherein said at least one flange portion includes at least one outer flange layer located outwardly from between said connecting layers, said at least one outer flange layer being located to extend exclusively within said at least one flange portion.

6. The improvement according to claim 5 wherein said at least one outer flange layer is formed to include unidirectional fiber applications extending in a direction parallel to the longitudinal direction of said girder.

7. The improvement according to claim 1 wherein said at least one flange portion includes flange layers which consist of a plurality of age-hardened individual layers which are glued together.

8. The improvement according to claim 1 wherein said layers consist of prefabricated fibrous layers.

9. The improvement according to claim 1 wherein said layers consist of wound laminates.

10. The improvement according to claim 1 wherein said layers consist of rovings.

11. The improvement according to claim 1 wherein said layers consist of layers produced by wet lamination.