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Composite structural member with thin deck portion and method of fabricating the same
| Details |
Inventors: Grossman, Stanley J.;
Assignee:
Primary Examiner: Bagnell; David
Assistant Examiner: Singh; Sunil
Attorney, Agent or Firm: McAfee & Taft
A composite structural member with a thin deck portion. The composite structural member comprises a plurality of longitudinally extending girders with a plurality of composite members disposed thereon. The composite structural member comprises a plurality of transversely extending beams with a molded deck structure thereon. In one embodiment, the composite member is a prefabricated composite unit which is installed on the girders and attached thereto. In a second embodiment, the beams are positioned on the girders, and the deck portion is poured in place. In both embodiments, the molded deck portion is substantially thinner than for the prior art structures, but the present invention has greater strength characteristics. A preferred thickness of the deck portion is in the range of about 4 inches to less than about 6.5 inches, with a preferred thickness of five inches. The thickness of the deck portion is such that a single layer of reinforcing material may be used. |
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DETAILED DESCRIPTION The present invention is a composite structural member with a thin deck portion compared to prior structures.
The invention is particularly well adapted for bridge structures, but is not intended to be so limited.
The invention may be described as a structural apparatus comprising a plurality of girders extending in a longitudinal direction with the girders being spaced from one another in a transverse direction with respect to the girders and a composite member disposed above the girders.
The composite member comprises a plurality of beams extending in the transverse direction, a plurality of beam shear connectors attached to the beams, and a molded deck portion molded around the beam shear connectors.
The deck portion is disposed at least partially above the beams.
The apparatus further comprises means for connecting the composite member to the girders.
In one embodiment, the composite member comprises a plurality of composite units which are positioned adjacent to one another on the girders.
Preferably, the composite units are prefabricated, although they may be poured in place.
In one preferred embodiment, the composite units are prefabricated by forming them in an inverted position.
In the first embodiment, the deck portions of the composite units define a plurality of openings therein with each opening being aligned with a gap defined between a pair of adjacent beams.
The means for connecting in this embodiment comprises a bulkhead disposed in each of the gaps and aligned with a corresponding one of the openings, a girder shear connector attached to each girder and extending into corresponding ones of the bulkheads and openings, and a grouting material filling the bulkheads and openings and surrounding the girder shear connectors.
In a second embodiment, the molded deck portion of the composite member is poured in place on the beams.
In this embodiment, the means for connecting comprises a girder shear connector attached to each girder and extending therefrom, and a support portion extending downwardly from the deck portion and integral therewith which is molded around the girder shear connectors
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