Bend steel plate girder system for bridges

• US 20060265819A1
• Filed: 04/17/2006
• Published: 11/30/2006
• Est. Priority Date: 04/15/2005
• Status: Active Grant

• Current Assignee: NUtech Ventures
• Original Assignee: Board of Regents of the University of Nebraska
• Inventors: Azizinamini, Atorod
• Granted Patent: US 7,627,921 B2
• Time in Patent Office: Days
• US Class Current: 14/74.500
• CPC Class Codes: E01D 2/00 Bridges characterised by the cross-section of their bearing spanning structure
• CPC Class Codes: E01D 2101/268 Composite concrete-metal
• CPC Class Codes: Y10T 29/49634 Beam or girder

Abstract

A structural support system employs a modified inverted box girder design for improved performance and ease of fabrication. Each girder of a series of girders is formed with an upper flange section, a set of web sections extending from opposite lateral sides of the upper flange section, and a base section below the web sections. The base section includes individual flanged footings that project generally towards one another. The particular cross-sectional configuration of each girder may be formed by bending a continuous steel plate along at least a first set of preselected parallel lines to establish a set of upper continuous transitional bends with the upper flange section therebetween, as well as a remainder portion forming at least the set of web sections. A deck is coupled with the series of girders to form the structural support system.

Claims

1. A load-carrying girder presenting a longitudinal span for supporting an overlying superstructure, comprising:

an upper flange section defining a bearing surface;

a set of upper continuous transitional bends formed on opposed lateral sides of the upper flange;

a set of web sections spaced apart from one another, each web section extending downwardly from one of the transitional bends; and

a base section formed below and extending from the set of web sections, the base section including individual flanged footings projecting generally laterally towards one another.

2. The girder of claim 1, wherein the base section further includes:

a set of lower continuous transitional bends each formed at a bottom portion of one of the web sections of the set of web sections, the flanged footings extending from the set of lower continuous transitional bends.

3. The girder of claim 2, formed by a process including the steps of:

bending a continuous steel plate along a first set of preselected parallel lines to establish the set of upper continuous transitional bends and the upper flange section between the set of upper continuous transitional bends; and

bending the continuous steel plate along a second set of preselected parallel lines to establish the set of lower continuous transitional bends, the set of web sections between the set of upper continuous transitional bends and the set of lower continuous transitional bends, and the flanged footings.

4. The girder of claim 1, wherein the upper flange section is formed with a longitudinally extending ridge.

5. The girder of claim 4, wherein the ridge of the upper flange is formed with a set of laterally extending, spaced apart apertures.

6. The girder of claim 1, wherein the set of web sections are arranged in a divergent relationship with one another moving away from the upper flange section.

7. The girder of claim 1, wherein the flanged footings of the base section are configured such that a continuous channel opening is formed therebetween.

8. The girder of claim 1, wherein each web section of the set of web sections has a lower edge straddling one of the flanged footings of the base section.

9. A structural support system comprising:

a series of longitudinally oriented, parallel girders, each girder having an upper flange section defining a bearing surface, a set of web sections extending downwardly from transitional bends formed on opposed lateral sides of the upper flange section, and a base section formed below the set of web sections, the base section including individual flanged footings projecting generally laterally towards one another; and

a deck coupled to the series of girders through the upper flange section, the deck having a bottom surface overlying the bearing surface of the series of girders.

10. The support system of claim 9, wherein the upper flange section of each girder is formed with a longitudinally extending ridge having a set of spaced apart apertures through which the deck couples with the series of girders.

11. The support system of claim 9, wherein the set of web sections of each girder are arranged in a divergent relationship with one another moving away from the upper flange section.

12. The support system of claim 9, wherein the flanged footings of the base section of each girder are configured such that a continuous channel opening is formed therebetween.

13. The support system of claim 9, formed by a process including the steps of:

a) fabricating each girder of the series of girders, the step of fabrication including bending a continuous steel plate along a plurality of preselected longitudinal lines to form at least the upper flange section and the set of web sections of a respective girder;

b) fabricating the deck as a concrete slab encasing a grid of reinforcing members; and

c) coupling the deck to the series of girders;

wherein steps (b) and (c) are performed either simultaneously or separately.

14. The support system of claim 13, wherein process step (a) further includes forming the base section through the fabrication step of bending the continuous steel plate along the plurality of preselected longitudinal lines.

15. The support system of claim 13, wherein process step (c) includes extending at least some of the reinforcing members through a raised feature of the upper flange section of each girder.

16. The support system of claim 13, wherein the raised feature of the upper flange section comprises a longitudinally extending ridge formed with a set of spaced apart apertures.

17. A method for fabricating a load-carrying element of a structural support system, comprising:

bending a series of continuous steel plates along a plurality of preselected longitudinal lines to form a series of load-carrying girders, each girder having an upper flange section defining a bearing surface, a set of web sections extending downwardly from transitional bends formed on opposed lateral sides of the upper flange section, and a base section formed below the set of web sections, the base section including individual flanged footings;

forming a concrete slab deck encasing a grid of reinforcing members; and

coupling the deck to each girder of the series of girders such that the series of girders extend in a parallel arrangement with respect to one another.

18. The method of claim 17, wherein the flanged footings of the base section project generally laterally towards one another.

19. The method of claim 17, wherein the step of coupling the deck to each girder includes extending at least some of the reinforcing members through a raised feature of the upper flange section of each girder.

20. The method of claim 19, wherein the raised feature of the upper flange section comprises a longitudinally extending ridge formed with a set of spaced apart apertures.