Stock material or miscellaneous articles – Structurally defined web or sheet – Including grain – strips – or filamentary elements in...
Patent
1996-10-08
1998-04-07
Cannon, James C.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including grain, strips, or filamentary elements in...
522238, 5230913, 5230916, 527307, 5274519, 52DIG7, 144344, 156154, 156155, 156305, 1563077, 264 461, 264 464, 264139, 264231, 264232, 264233, 427336, 427352, 427353, 428141, 428172, 4282981, 4282987, 4282991, 4282997, 428902, B32B 306, B32B 330, B32B 508, E04C 312, E04C 326, E04C 329
Patent
active
057362203
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention pertains to the reinforcement of structural wood members, including beams, columns, panels, and trusses. More particularly, the present invention pertains to synthetic reinforcements, each having a surface adapted for improved adhesion into a structural wood member. The purpose of the reinforcements being to brace the member against tensile stress or compression stress or both caused by a heavy loading of the member. The processes for fabricating such a synthetic reinforcement are also a part of the present invention.
DESCRIPTION OF THE RELATED ART
Beams, trusses, joists, and columns are the typical structural members that support the weight or loads of structures, including buildings and bridges. Structural members may be manufactured from a variety of materials, including steel, concrete, and wood, according to the structure design, environment, and cost.
Wood structural members are now typically manufactured from multiple wood segments that are bonded together, such as in glue-laminated members, laminated veneer lumber, parallel strand lumber, and I-beams. These manufactured wood structural members have replaced sawn lumber or timbers because the former have higher design limits resulting from better inspection and manufacturing controls. Wood is a highly desirable material for use in structural members because of its advantageous characteristics, including strength to weight, appearance, cyclic load response, and fire resistance.
Laminated beams can be used structurally to span open areas to support loads of many tons. Typically, when loading a laminated beam or beams with a uniform load between support points, the bottom laminae are primarily subjected to tensile stress, while the top laminae are primarily subjected to compressive stress.
Synthetic reinforcements for wood beams can be designed specifically to resist high tensile stress or to resist high compressive stress. The load-bearing capacity of laminated beams may be increased substantially by adding synthetic reinforcements to the areas of greatest stress, namely, close to the bottom laminae and close to the top laminae. The synthetic reinforcements used in the areas of high tensile and compressive stress would typically differ to provide superior reinforcing.
There is a need for synthetic reinforcements that can be effectively and economically adhered to a wood lamina. Until the present invention, plastic panels could be adhered to wood beams and to each other and other structural wood members only with expensive epoxy adhesives. In contrast, the wood laminae of wood structural members are typically bonded together with a low-cost adhesive such as resorcinol, phenol-resorcinol, cross-linked melamine, and polyvinyl acetate (PVA). Thus, a separate gluing step and a separate gluing application apparatus are typically necessary for gluing synthetic reinforcements to the wood laminae to make reinforced glue-laminated wood beams.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide improved adhesion of synthetic reinforcements to one another and into structural wood members, including laminated wood members.
Another object of the present invention is to provide synthetic reinforcements having a surface treatment that facilitates the use of commercial grade adhesives such as resorcinol to adhere the improved synthetic reinforcement to wood members.
A further object of the present invention is to provide an improved synthetic reinforcement including a resin encasement having a major surface with micro-recesses that increase the surface area of the resin encasement and increase adhesion into the substrate thereby increasing the sheer performance of the adhesive.
The problems associated with known reinforcement panels are addressed in the present invention by providing reinforcements having a surface adapted for improved adhesion to wood laminae and to one another. The present invention provides a synthetic reinforcement that may include a plurality of continuous fibers in a res
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