Composite bridge with precompression system
OwnerRoosseno Soerjohadikusumoinventor
Life of this patent
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Abstract
A composite bridge structure having a precompressed beam for supporting loads thereon is described. A plurality of spaced apart consoles are secured to the beam, the consoles being urged apart to create a bending moment in the beam having a substantially parabolic distribution between the ends of the beam. The bending moment is in a direction opposite to the direction of the moment created by the loads supported by the beam. As a consequence of the precompression, a longitudinal force and bending moment working on the composite bridge structure improves the load carrying capacity of the structure.
Claims21
A composite bridge structure having a beam for supporting loads thereon, the bridge structure comprising a plurality of spaced apart concrete consoles secured to the beam, the consoles located on the beam and being urged apart for creating a bending moment in the beam in a direction opposite to the direction of the moment created by the load supported by the beam.
A composite load-supporting structure comprising:
- a beam for supporting loads thereon, the beam having two ends and upper and lower surfaces;
- a plurality of consoles comprising concrete slabs;
- means for securing the consoles to the upper surface of the beam in spaced apart relationship between the two ends of the beam;
- and
- means for urging the consoles a part to provide a bending moment in the beam that has a substantially parabolic distribution between the ends of the beam in a direction opposite to the direction of the moment created by loads supported by the beam.
A method of prestressing a composite structure comprising a beam having two ends, said beam having a plurality of spaced apart consoles secured to said beam between the ends thereof, the method comprising the steps of:
- urging apart the consoles to create a bending moment in the beam in a direction opposite to load-produced bending moments;
- and
- while the consoles are urged apart, filling voids between adjacent consoles with essentially non-compressible material for maintaining the consoles in the urged apart condition.
A composite load supporting structure capable of storing axial tensile strain energy comprising:
- an I-beam having an upper flange, a lower flange, a vertical web interconnecting the flanges, and a longitudinal neutral axis;
- a plurality of adjacent consoles comprising concrete slabs, the consoles being serially disposed parallel to the beam longitudinal axis and secured on the beam upper flange;
- a plurality of steel shear connectors associated with each console and attached to the beam upper flange and extending into the console to secure the console to the beam, the shear connectors being adapted for transferring longitudinal stress from the consoles to the beam;
- and
- force imparting means for imparting a predetermined longitudinal tensile force externally to pairs of adjacent consoles to induce precompression in the concrete of the consoles, whereby the shear connectors transfer at least part of the precompression from the concrete as longitudinal stress to the beam upper flange to store such stress in the beam as axial tensile strain energy.
Dependencies are inferred from the claim text.