US 6,915,615 B2 · Prestressed composite truss girder and construction method of the same

Abstract

The present invention relates to prestressed composite truss girder and construction method of the same. The prestressed composite truss girder of the present invention comprises a concrete bottom plate having structure of composite truss; a lower-chord member being composed of prestressed concrete wherein prestress is induced to resist against the elongation strength generated when composing and not composing and to reduce the droop occurred at the state of composition and having perpendicular and horizontal cross-section of certain shape and certain length; web members wherein vertical chords and diagnal chords composed of rolled steel to upper plate of said lower-chord member; and upper-chord member combined with said web members along the longitudinal direction of said lower-chord member to resist against the compressive force generated before said concrete bottom plate being composed.

Claims5

Dependent claims

A prestressed composite truss girder having a truss structure whereon a slab concrete is composed comprises:

a lower-chord member composed of prestressed concrete wherein prestress is introduced to resist against tensile stress and to reduce the displacement generated by external loads and having perpendicular and horizontal cross-section of certain shape and certain length;
web member wherein vertical members and diagonal members composed of a steel beam to resist against the shear stress applied on the composite girder are connected alternately with the upper face of said lower-chord member;
and
upper-chord member composed of a steel plate connected with said web member along the longitudinal direction of said lower-chord member to resist against the compressive force generated before said concrete slab is composed,
wherein said lower-chord member comprises a plurality of wire-type strands or tendons placed inside the lower-chord member in the longitudinal direction to introduce the prestress to a certain distribution along the lower-chord member.

2 more elements

A construction method of a prestressed composite truss girder comprises steps of:

(a) forming a prestressed concrete lower chord member having certain length, wherein certain prestress is introduced to the axial direction;
(b) connecting alternately the vertical members and the diagonal members composed of structural rolled steel having certain length on the upper face of said lower-chord member;
and
(c) connecting a planar upper chord member with said vertical members and diagonal members along the longitudinal direction of said lower chord member.

1 more element

Dependencies are inferred from the claim text.

Prestressed composite truss girder and construction method of the same

Life of this patent

Prestressed composite truss girder and construction method of the same

Life of this patent

Abstract

Claims5