CA1278413C - Plate web girder - Google Patents
Plate web girderInfo
- Publication number
- CA1278413C CA1278413C CA000530784A CA530784A CA1278413C CA 1278413 C CA1278413 C CA 1278413C CA 000530784 A CA000530784 A CA 000530784A CA 530784 A CA530784 A CA 530784A CA 1278413 C CA1278413 C CA 1278413C
- Authority
- CA
- Canada
- Prior art keywords
- web
- corrugations
- ripples
- corrugated
- girder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002184 metal Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 2
- 238000005452 bending Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C3/06—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web
- E04C3/07—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal with substantially solid, i.e. unapertured, web at least partly of bent or otherwise deformed strip- or sheet-like material
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0408—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section
- E04C2003/0413—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by assembly or the cross-section being built up from several parts
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0426—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section
- E04C2003/0434—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by material distribution in cross section the open cross-section free of enclosed cavities
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/04—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal
- E04C2003/0404—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects
- E04C2003/0443—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of metal beams, girders, or joists characterised by cross-sectional aspects characterised by substantial shape of the cross-section
- E04C2003/0452—H- or I-shaped
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Roof Covering Using Slabs Or Stiff Sheets (AREA)
- Bridges Or Land Bridges (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
ABSTRACT
A plate web girder comprising two flanges spaced by a web of which the web comprises a metal sheet which is "rippled", that is corrugated with small amplitude small wave length corrugations or ripples and then corrugated with large amplitude large wave length corrugations;
both the ripples and the corrugations extending in the same direction from flange to flange.
A plate web girder comprising two flanges spaced by a web of which the web comprises a metal sheet which is "rippled", that is corrugated with small amplitude small wave length corrugations or ripples and then corrugated with large amplitude large wave length corrugations;
both the ripples and the corrugations extending in the same direction from flange to flange.
Description
The present invention relates to plate web girders which conventionally comprise a pair of elongate parallel spaced apart flanges and an elongate web extending therebetween.
It is well established that, when a bending moment is imposed upon such plate web girders a large proportion of the resultant bending stress is carriecl by the flanges and that the web must be sufficiently stiff to hold the flanges in spaced apart parallel relationship. That is to say, the integrity of the girder depends inter alia, on the web not buckling.
It is known to corrugate the web to increase its stiffness to thereby provide a girder with an improved increased strength to weight ratio. However, it has been found that large corrugated webs are none the less prone to buckling because due to the size of the corrugations, the web acts locally like a plane web and as a result local buckling may occur.
It is an object of the present invention to provide an improved girder.
Accordingly, the present invention consists in a girder co~prising a corrugated web as defined herein, fixedly interposed between two flanges, characterised in that said web is rippled, the ripples extending in a direction substantially parallel to thè direction of extension of the corrugations.
A preferred embodiment of the present invention will now be described by way of example only, with reference - 2 - ~
27~
to the accompanying drawings in which;
Figure 1 is a sectional plan view of a girder according to the invention; and Figure 2 is an enlarged sectional plan view showing an encircled portion of the girder in figure 1.
Referring to the drawings, a girder 1 is shown which comprises a corrugated web 2 fixedly interposed between two flanges 3, only the lower one of which is shown for clarity.
As is best shown in figure 2 the corrugated web 2 is rippled.
Preferably, the thickness "t" of the web material is in the range, 2t~ a~ 6t where "a" is the amplitude of the ripples.
Additionally, the wave length "b" of the ripples should be in the range 3t~ b ~6t It has been found that a suitable way of producing the rippled corrugated plate is to firstly pass a flat plate through a press which stamps the ripples, a few at a time, into the plate using a pair of dies fashioned in the manner of a pair of intermeshing racks. The rippled un-corrugated sheet is then passed betwèen a pair of parallel rollers, each having axially extending, radially projecting, intermeshing protruberances which effect the bending of the rippled plate into its final corrugated form. The rippled corrugated web is then welded to the ~2S7~ 3 flanges in conventiorlal manner.
Preferably, the wave lenght "L" of the corrugations is in the range, ~ A ~ L ~ 4A
where "A" is the amplitude of the corrugations.
In the preferred embodiment the corrugations are defined by a serles of substantially semi-circular, opposed curve portions. However, a corrugated web is d~flned herein to comprise a web being corrugated in any manner so as to have crests and troughs and is not restricted to include only webs having sinusoidal corrugations.
Similarly the ripples may have any of the abovementioned forms.
For preference the gi~ders are fabricated rom steel however, they may be fabricated from any metal or from any suitable plastic.
It is well established that, when a bending moment is imposed upon such plate web girders a large proportion of the resultant bending stress is carriecl by the flanges and that the web must be sufficiently stiff to hold the flanges in spaced apart parallel relationship. That is to say, the integrity of the girder depends inter alia, on the web not buckling.
It is known to corrugate the web to increase its stiffness to thereby provide a girder with an improved increased strength to weight ratio. However, it has been found that large corrugated webs are none the less prone to buckling because due to the size of the corrugations, the web acts locally like a plane web and as a result local buckling may occur.
It is an object of the present invention to provide an improved girder.
Accordingly, the present invention consists in a girder co~prising a corrugated web as defined herein, fixedly interposed between two flanges, characterised in that said web is rippled, the ripples extending in a direction substantially parallel to thè direction of extension of the corrugations.
A preferred embodiment of the present invention will now be described by way of example only, with reference - 2 - ~
27~
to the accompanying drawings in which;
Figure 1 is a sectional plan view of a girder according to the invention; and Figure 2 is an enlarged sectional plan view showing an encircled portion of the girder in figure 1.
Referring to the drawings, a girder 1 is shown which comprises a corrugated web 2 fixedly interposed between two flanges 3, only the lower one of which is shown for clarity.
As is best shown in figure 2 the corrugated web 2 is rippled.
Preferably, the thickness "t" of the web material is in the range, 2t~ a~ 6t where "a" is the amplitude of the ripples.
Additionally, the wave length "b" of the ripples should be in the range 3t~ b ~6t It has been found that a suitable way of producing the rippled corrugated plate is to firstly pass a flat plate through a press which stamps the ripples, a few at a time, into the plate using a pair of dies fashioned in the manner of a pair of intermeshing racks. The rippled un-corrugated sheet is then passed betwèen a pair of parallel rollers, each having axially extending, radially projecting, intermeshing protruberances which effect the bending of the rippled plate into its final corrugated form. The rippled corrugated web is then welded to the ~2S7~ 3 flanges in conventiorlal manner.
Preferably, the wave lenght "L" of the corrugations is in the range, ~ A ~ L ~ 4A
where "A" is the amplitude of the corrugations.
In the preferred embodiment the corrugations are defined by a serles of substantially semi-circular, opposed curve portions. However, a corrugated web is d~flned herein to comprise a web being corrugated in any manner so as to have crests and troughs and is not restricted to include only webs having sinusoidal corrugations.
Similarly the ripples may have any of the abovementioned forms.
For preference the gi~ders are fabricated rom steel however, they may be fabricated from any metal or from any suitable plastic.
Claims (4)
1. A girder comprising a corrugated web having curvilinear corrugations, said web being fixedly interposed between two flanges, wherein said web is rippled, the ripples extending in a direction substantially parallel to the direction of extension of the corrugations and wherein the wave length "b" of the ripples is in the range 3t ? b ? 6t wherein "t" is the thickness of the web material and the apmplitude "a" of the ripples is in the range 2t ? a ? 6t.
2. A girder according to claim 1 wherein the wave length "L" of the corrugations is in the range 2A ? L ? 4A
where "A" is the amplitude of the corrugations.
where "A" is the amplitude of the corrugations.
3. A girder according to claim 1 fabricated from metal.
4. A girder according to claim 2 fabricated from metal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU54266/86A AU581294B2 (en) | 1986-03-04 | 1986-03-04 | Plate web girder |
| AU54266/86 | 1986-03-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1278413C true CA1278413C (en) | 1991-01-02 |
Family
ID=3740263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000530784A Expired - Lifetime CA1278413C (en) | 1986-03-04 | 1987-02-27 | Plate web girder |
Country Status (7)
| Country | Link |
|---|---|
| AU (1) | AU581294B2 (en) |
| CA (1) | CA1278413C (en) |
| DE (1) | DE3706330A1 (en) |
| FR (1) | FR2595394B3 (en) |
| GB (1) | GB2194807B (en) |
| IT (1) | IT8747687A0 (en) |
| NZ (1) | NZ219278A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU683311B2 (en) * | 1993-10-22 | 1997-11-06 | Terre Armee Internationale | Strip for use in stabilised earth structures |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2076670A (en) * | 1970-10-06 | 1972-04-13 | Cyclone Company Of Australia Limited | Improved structural member |
| DE2364297A1 (en) * | 1973-12-22 | 1975-07-24 | Karl Hartmann | BAR-SHAPED COMPONENT |
| US4047354A (en) * | 1976-06-15 | 1977-09-13 | Alcan Aluminum Corporation | Composite beam structure |
| AU584670B2 (en) * | 1985-02-06 | 1989-06-01 | Folded Web Beams Pty. Ltd. | Plate web girder |
-
1986
- 1986-03-04 AU AU54266/86A patent/AU581294B2/en not_active Ceased
-
1987
- 1987-02-16 NZ NZ219278A patent/NZ219278A/en unknown
- 1987-02-20 GB GB8704048A patent/GB2194807B/en not_active Expired - Lifetime
- 1987-02-27 DE DE19873706330 patent/DE3706330A1/en not_active Withdrawn
- 1987-02-27 CA CA000530784A patent/CA1278413C/en not_active Expired - Lifetime
- 1987-03-03 FR FR8703124A patent/FR2595394B3/en not_active Expired
- 1987-03-04 IT IT8747687A patent/IT8747687A0/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FR2595394A1 (en) | 1987-09-11 |
| FR2595394B3 (en) | 1988-08-19 |
| AU5426686A (en) | 1987-09-10 |
| IT8747687A0 (en) | 1987-03-04 |
| GB2194807B (en) | 1990-01-04 |
| NZ219278A (en) | 1990-01-29 |
| AU581294B2 (en) | 1989-02-16 |
| GB2194807A (en) | 1988-03-16 |
| GB8704048D0 (en) | 1987-03-25 |
| DE3706330A1 (en) | 1987-09-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4251973A (en) | I-Beam construction and process therefor | |
| CA2077429C (en) | Roll formed metal member | |
| US4862666A (en) | Profiled sheet for building purposes | |
| US4233833A (en) | Method for stretching sheet metal and structural members formed therefrom | |
| US6183836B1 (en) | Folded-sheet honeycomb structure | |
| CA2230608A1 (en) | Concrete-made panel and method of fabricating the same | |
| US4689261A (en) | Rounded corrugated sheet and method and apparatus for its manufacture | |
| ATE161913T1 (en) | REINFORCED RECTANGULAR METAL PASSAGE | |
| US3059733A (en) | Reinforced panel sheets | |
| US5012626A (en) | Structural bar | |
| RU93053994A (en) | METHOD AND DEVICE FOR CONNECTING METAL SHEETS DEPENDED ON OTHER TO OTHERS BY LOCAL PLASTIC DEFORMATION | |
| US5956919A (en) | Spanning member with convoluted web and C-shaped flanges | |
| CA1278413C (en) | Plate web girder | |
| US4338381A (en) | Structural member | |
| US2842237A (en) | Method and means of improving the structural characteristics of sheet material | |
| US6167674B1 (en) | Light-gauge truss framing element | |
| GB2228752A (en) | Metal beam | |
| GR900300156T1 (en) | Method for making a display panel, and panel obtained by this method | |
| DE3461214D1 (en) | Fastening element for fastening profiled plates to a support | |
| JPS56158224A (en) | Production of h-beam having corrugation in central part of web | |
| AU716272B2 (en) | A structural building element | |
| KR820002428Y1 (en) | Curved h-beam | |
| RU2016983C1 (en) | Reinforcing member | |
| GB2170835A (en) | Fish plate for connecting lengths of rolled steel joist end to end to form an arch | |
| AT396150B (en) | Steel girder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |