Modular polymer matrix composite support structure and methods of constructing same

• US 5,794,402 A
• Filed: 09/30/1996
• Issued: 08/18/1998
• Est. Priority Date: 09/30/1996
• Status: Expired due to Fees

• Current Assignee: Martin Marietta Materials Incorporated (Martin Marietta Composites Incorporated)
• Original Assignee: Martin Marietta Materials Incorporated (Martin Marietta Composites Incorporated)
• Inventors: Abrahamson, Eric, Dumlao, Chris
• Primary Examiner(s): STEPHAN, BETH A
• Application Number:
  US08/723,109
• Time in Patent Office: 687 Days
• Field of Search: 14/73, 14/73.1, 52/262, 52/263, 52/783.11, 52/783.17, 52/783.19, 52/793.1, 52/796.1
• US Class Current: 52/783.17
• CPC Class Codes: B63B 19/14 Hatch covers opening devices in general E05F
• CPC Class Codes: B63B 3/48 Decks planking B63B5/06
• CPC Class Codes: E01D 19/125 Grating or flooring for bridges waterproofing thereof E01D19/083; floors in general E04B5/00
• CPC Class Codes: E01D 2/00 Bridges characterised by the cross-section of their bearing spanning structure
• CPC Class Codes: E01D 2101/40 Plastics
• CPC Class Codes: Y10T 428/24248 One piece
• CPC Class Codes: Y10T 428/31678 Of metal
• CPC Class Codes: Y10T 428/31909 Next to second addition polymer from unsaturated monomers

Abstract

A modular structural section for use in support structures such as load bearing decks or highway bridges. The modular structural section includes at least one beam and a load bearing deck preferably formed of a polymer matrix composite material. The deck includes a core having elongated core members having a polygonal shape, preferably a trapezoidal shape. Alternatively, the load bearing deck contains at least one sandwich panel suitable for applications such as barge decks, hatchcovers, and other load bearing wall applications. Methods of constructing a support structure utilizing the novel modular structural section and support members are also provided.

Claims

1. A load bearing support structure comprising:

at least one modular structural section; and

support means supporting said at least one modular structural section;

said at least one modular structural section supported on and connected with said support means;

said at least one modular structural section comprising;

a load bearing deck including at least one sandwich panel, said at least one sandwich panel having;

an upper surface;

a lower surface; and

a core including, a plurality of adjacent, substantially hollow, elongated core members positioned between said upper surface and said lower surface, each of said elongated core members including a pair of side walls and upper and lower walls connecting the side walls, at least one side wall of said pair of side walls is disposed at an oblique angle to one of said upper and lower surfaces such that said pair of side walls and said upper and lower walls, when viewed in cross-section, define a polygonal shape, and each of said elongated core members has one of said side walls positioned generally adjacent to one of said side walls of one of the adjacent elongated core members and the other of said side walls positioned adjacent to one of said side walls of one of the adjacent elongated core members.

2. The support structure as defined in claim 1, wherein said at least one modular structural section further comprises:

at least one beam having a pair of lateral flanges, each flange of said pair of lateral flanges positioned on and supported by one of said support means, said at least one beam further comprising a medial web between and extending below said pair of lateral flanges,

said at least one sandwich panel supported by said at least one beam.

3. The support structure as defined in claim 1, wherein said elongated core members are aligned longitudinally in a direction of a span of said support structure.

4. The support structure as defined in claim 1, wherein said elongated core members have a cross-section that defines a trapezoid.

5. The support structure as defined in claim 1, wherein said elongated core members are formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

6. The support structure as defined in claim 1, wherein said upper surface comprises an upper facesheet, and said lower surface comprises a lower facesheet, said upper surface and said lower surface being formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

7. The support structure as defined in claim 1, wherein said at least one sandwich panel comprises a plurality of interconnected sandwich panels.

8. A support structure as defined in claim 1, wherein said support means are connected with said at least one modular structural section, such that said support structure is a simply-supported support structure.

9. The support structure as defined in claim 2, wherein said support structure comprises at least one support member, wherein at least one of said at least one beam and said at least one support member is formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

10. The support structure as defined in claim 1, further comprising a wear surface overlying an upper surface of said deck for withstanding foot and vehicular traffic.

11. A modular structural section for constructing a support structure comprising:

a load bearing deck including at least one sandwich panel having;

an upper surface;

a lower surface; and

a core including, a plurality of adjacent substantially hollow, elongated core members positioned between said upper surface and said lower surface, each of said elongated core members comprises a pair of side walls and upper and lower walls connecting the side walls, at least one of said side walls is disposed at an oblique angle to one of said upper and lower surfaces such that said pair of side walls and said upper and lower walls, when viewed in cross-section, define a polygonal shape, and each of said elongated core members has one of said side walls positioned generally adjacent to one of said side walls of one of the adjacent elongated core members and the other of said side walls positioned adjacent to one of said side walls of one of the adjacent elongated core members; and

modular support means supporting said deck, said deck connected with and supported on said modular support means.

12. The modular structural section as defined in claim 11, wherein said modular support means of said at least one modular structural section comprise:

at least one beam having a pair of lateral flanges, said pair of lateral flanges adapted to be positioned on and supported by a support member, said at least one beam further comprising a medial web between and extending below said flanges,

said at least one sandwich panel supported by said at least one beam.

13. The modular structural section as defined in claim 11, wherein said plurality of elongated core members are aligned longitudinally in a direction of a span of the modular structural section.

14. The modular structural section as defined in claim 11, wherein said elongated core members have a cross-section that defines a trapezoid.

15. The modular structural section as defined in claim 11, wherein said elongated core members are formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

16. The modular structural section as defined in claim 15, wherein each of said core members includes longitudinally opposite end portions, a portion of said reinforcing fibers of at least one of said elongated core members is unidirectionally oriented between said longitudinally opposite end portions of said elongated core members.

17. The modular structural section as defined in claim 11, wherein at least one of said upper surface and said lower surface further comprises facesheets formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

18. A method of constructing a support structure comprising the steps of:

providing the at least one support member;

positioning at least one modular structural section on said at least one support member, said at least one modular structural section comprising;

at least one beam supported on said at least one support member, and

a load bearing deck supported on said at least one beam, said deck including at least one sandwich panel having;

a core including a plurality of adjacent elongated core members each having side walls and upper and lower walls connecting the side walls, which when viewed in cross-section define a polygonal shape, and each of said elongated core members has one of said side walls positioned generally adjacent to one of said walls of one of the adjacent elongated core members and the other of said side walls positioned adjacent to one of said side walls of one of the adjacent elongated core members; and

connecting said at least one modular structural section and said at least one support member.

19. The method of constructing a support structure as defined in claim 18, wherein said polygonal shape is a trapezoid.

20. The method of constructing a support structure as defined in claim 18, wherein said step of positioning said at least one modular structural section further comprises the steps of:

positioning said at least one beam upon said at least one support member;

positioning said load bearing deck upon said at least one beam; and

connecting said at least one beam and said deck.

21. The method of constructing a support structure as defined in claim 20, wherein said step of positioning said deck comprises positioning said elongated core members in a longitudinal direction generally parallel to a direction of a span of said support structure.

22. The method of constructing a support structure as defined in claim 18, further comprising the step of:

applying a wear surface to an upper surface of said deck for withstanding foot and vehicular traffic.

23. The method of constructing a support structure as defined in claim 18, wherein said step of positioning said deck further comprises the steps of:

positioning a plurality of load bearing deck panels on said at least one beam, each panel of said plurality of load bearing deck panels formed of a first polymer matrix composite material; and

interconnecting each panel of said plurality of load bearing deck panels with an adjacent deck panel.

24. A method of constructing a support structure as defined in claim 18, wherein said connecting step comprises connecting said at least one support member and said modular structural sections such that said modular structural sections are simply supported.

25. The method of constructing a support structure as defined in claim 18, wherein said step of providing comprises locating existing support structure support members positioned to receive and support said at least one modular structural section.

26. The method of constructing a support structure as defined in claim 25, further comprising the step of removing an existing support structure span while retaining existing support members spaced apart a predetermined distance, said removing step preceding said locating step.

27. A load bearing deck structure comprising:

at least one sandwich panel including;

an upper surface;

a lower surface; and

a core including a plurality of adjacent substantially hollow, elongated core members positioned between said upper surface and said lower surface,

each of said elongated core members including a pair of side walls and upper and lower walls connecting the side walls, at least one of said side walls is disposed at an oblique angle to at least one of said upper and lower surfaces such that said pair of side walls and said upper and lower walls, when viewed in cross-section, define a polygonal shape, and

each of said elongated core members has one of said side walls positioned generally adjacent to one of said side walls of one of the adjacent elongated core members and the other of said side walls positioned adjacent to one of said side walls of one of the adjacent elongated core members;

said deck adapted to be supported by support means in constructing a structure wherein at least one of said plurality of elongated core members is formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

28. The deck structure according to claim 27, wherein said upper and lower surfaces are generally parallel and each of said elongate members further comprises at least one vertical side wall disposed generally perpendicular to said upper and lower surfaces, said vertical side wall providing structural support for said upper and lower surfaces.

29. The deck structure as defined in claim 27, wherein said upper surface comprises an upper facesheet and said lower surface comprises a lower facesheet, at least one of said upper facesheet and said lower facesheet is formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

30. The deck structure according to claim 27, wherein at least one of said elongated core members is formed of a polymer matrix composite material comprising reinforcing fibers and a polymer resin.

31. The deck structure as defined in claim 30, wherein each of said core members includes longitudinally opposite end portions, a portion of said fibers is unidirectionally oriented between said longitudinally opposite end portions.