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| Earthquaker protection system and method of installing same |
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Fabric reinforced beam and column connections
| Details |
Inventors: Fyfe, Edward R.; Isley, Jr., Frederick P.;
Assignee: Hexcel-Fyfe Co., L.L.C. (Del Mar, CA)
Primary Examiner: Canfield; Robert
Assistant Examiner:
Attorney, Agent or Firm: Oppenheimer Poms Smith
A technique for applying high strength fiber fabric to strengthen beams and the connection between beams and either supported platforms or supporting vertical columns is disclosed. Fabric made of high strength fibers such as glass, boron, or carbon, is laid over the connection between a beam and a platform, or between a beam and a supporting column, and impregnated with an epoxy resin or other polymer matrix. The fabric may be additionally fastened to the structural member using adhesives, fabric fasteners, or bolts. The invention is particularly well suited for retrofitting bridges, freeway overpasses, parking structures, and the like to prevent failure during an earthquake. |
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DETAILED DESCRIPTION A high strength composite material such as fiber glass fabric impregnated with a polymer matrix such as epoxy resin is affixed to a structural member at the point where the member intersects with another member, such that the same piece of composite material covers both members near the connection as well as covering the connection itself.
Typically, the composite material is comprised of multiple layers, with at least one layer having fibers oriented longitudinally 90.
degree.
from the direction in which fractures would otherwise typically propagate.
The composite material may be either formed at the work site by laying resin-impregnated fabric over the beam connection to be strengthened, or may be a shell that has been pre-formed and is applied to the structure in the field.
If the composite material is pre-formed, it is then attached to the structure using adhesives, anchor bolts, or through bolts to hold it tightly to the structure.
If the composite material is formed at the work site by laying fabric impregnated with resin over the structure, the resin serves additionally to adhere the composite material to the structure, and the use of additional fasteners is optional.
The fabric spreads stresses out over the surface of the structural member to which it is attached, increasing the ductility of the member.
Reinforced in this way, the member can now withstand much greater stresses before fracturing and spatling than could the unreinforced member.
In a first preferred embodiment, a composite reinforcement layer is formed by laying cloth sections onto a beam and a platform supported on the beam.
Preferably, resin is impregnated within the fabric before the fabric is applied to the structural member.
Alternatively, the fabric may be laid on the structural member, and impregnated with resin thereafter.
Alternatively, the composite reinforcement layer may be a pre-formed shell in the shape of a ranged channel that is applied to the underside of a beam and a platform supported by the beam, so as to encase the enclosed sides and bottom of the beam, and to cover at least a portion of the underside of the platform
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