WO1997028326A1 - Z-section structural member - Google Patents
Z-section structural member Download PDFInfo
- Publication number
- WO1997028326A1 WO1997028326A1 PCT/AU1997/000053 AU9700053W WO9728326A1 WO 1997028326 A1 WO1997028326 A1 WO 1997028326A1 AU 9700053 W AU9700053 W AU 9700053W WO 9728326 A1 WO9728326 A1 WO 9728326A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- lip
- flange
- structural member
- further characterised
- web
- Prior art date
Links
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
- E04C2003/0421—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 comprising one single unitary part
-
- 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
- E04C2003/0482—Z- or S-shaped
Definitions
- This invention relates to a structural member which has a Z-shaped cross-section and which is intended to be used as a load bearing element in a skeletal structure.
- the invention has been developed as a purlin for use in a roof-supporting building structure and the invention is hereinafter described in the context of a purlin. However, it will be understood that the invention does have broader application, to a structural member which is suitable for use in any load bearing structure.
- a typical Z-section purlin comprises a near- central web, two oppositely directed parallel flanges projecting outwardly from opposite ends of the web and a lip at the outer edge of each flange.
- the lips lie approximately parallel to the web and, in order to permit two purlin lengths to be connected in overlapping relationship, the purlin is formed with one flange narrower than the other.
- the present invention has been developed with the object of providing a section configuration that provides for increased strength relative to that obtained from the above described basic Z-section purlin configuration and, importantly, which has regard for factors that influence bending strength under different load and/or support conditions.
- an improvement in bending strength might be obtained by providing each of the lips with a lip return, that is with a lip portion that returns in a direction toward the web.
- the length of the narrower flange would need be reduced by an amount equal to or approaching the width of the lip return on the wider flange.
- any gain derived from inclusion of a lip return would tend to be negated by the required reduction in width of the narrower flange.
- the present invention has been developed as a Z-section purlin which is formed with a cross- section which incorporates lip returns and which also is configured to permit maximisation of the width of the narrower flange.
- the present invention provides an elongate structural member which is cold formed from steel and which has a Z-shaped cross-section comprising a web, two oppositely directed parallel flanges projecting outwardly from respective ends of the web and a lip at the outer edge of each flange.
- a first of the flanges has a width which is narrower than that of the second flange whereby two of the structural members may be joined in overlapping relationship, and the structural member is characterised in that:
- each lip is formed with a lip return which is disposed at an included angle ⁇ less than 180° to the lip, and
- the lip on the second flange projects in a direction to form an obtuse angle ⁇ greater than 90° but not greater than 180° with respect to the second flange.
- the lips on both of the flanges may be provided with lip returns without imposing an unacceptable reduction on the width of the first, narrower flange.
- the lip on the first, narrower flange may also be disposed at an angle ⁇ greater than 90° to the first flange, and it will normally (but not necessarily) be disposed at an angle which is equal to or less than the angle ⁇ which lies between the second, wider flange and its lip.
- ⁇ 2 anci that which is associated with the first, narrower flange
- the angle ⁇ 2 may be selected to be significantly greater than the angle ⁇ j as one way of providing for maximisation of the width of the narrower flange.
- the included angle ⁇ between the lip and the lip return associated with the second, wider flange may be equal to or different from that which is provided between the lip and the lip return which is associated with the first, narrower flange.
- the various angles ⁇ j , ⁇ 2 , 0 j and 0 will be selected to provide for optimisation of the strength of the structural member whilst permitting interconnection of two of the members in overlapping relationship.
- the obtuse angle ⁇ 2 between the second, wider flange and its associated lip would normally be not greater than
- the structural member is preferably formed so that the obtuse angle ⁇ 2 lies within the range
- the angle ⁇ j between the first, narrower flange and its associated lip also would normally be not greater than 135°. However, the angle ⁇ j preferably lies within the range 85° to 95° and most preferably is approximately
- the lip return angle 0 2 preferably lies within the range 55° to 85° and most preferably is in the order of 60°.
- the lip return angle j preferably lies within the range 85° to 95° and most preferably is approximately 90°.
- each lip preferably has a width equal to 20% to 60% of the width of the associated flange and most preferably has a width equal to 30% to 60% of the width of the associated flange.
- each lip return preferably has a width equal to 30% to 100% of the associated lip width and most preferably has a width equal to 30% to 80% of the associated lip width.
- the lip which is associated with the first, narrower flange may have a width which is the same as or different from the width of the lip which is associated with the second, wider flange.
- the lip return which is associated with the first, narrower flange may have a width which is the same as or different from the width of the lip return that is associated with the second, wider flange. However, it is preferred that the lip return which is associated with the first, narrower flange will have a width which is equal to or greater than that of the lip return that is associated with the second, wider flange.
- the web preferably is formed with at least one channel-shaped recess that extends in the longitudinal direction of the web.
- the or each channel-shaped recess preferably has a depth which is equal to 0.5 to 5.0 times the thickness of the material forming the web.
- the depth of the channel-shaped recess most preferably is within the range 0.5 to 3.0 times the thickness of the material forming the web.
- a plurality of parallel channel-shaped recesses preferably is formed within the web and, most preferably, four such recesses are provided.
- the channel-shaped recesses may have any desired cross-sectional form but they preferably have an arcuate form.
- the channel- shaped recesses preferably are orientated so that, when two of the structural members are connected in overlapping relationship, the channel-shaped recesses in the respective webs form complementary portions of longitudinally extending tunnels.
- Figure 1 shows a perspective view of one of the purlins
- Figure 2 shows an end view of a portion of two of the purlins located in overlapping relationship
- Figure 3 shows dimensional aspects of lip and lip return portions of the second, wider flange of one of the purlins
- Figure 4 shows graphs of buckling stress versus buckle half-wavelength for two different purlin sections when subjected to bending in a manner to place the wider flanges of the purlins in compression
- Figure 5 shows graphs which are similar to those of Figure 4 but when the same purlin sections are subjected to bending in a manner to place the narrow flanges of the purlins in compression.
- the purlin is cold formed from roll- reduced steel and it has a Z-shaped cross-section that comprises a web 10 and two oppositely projecting flanges 11 and 12 which extend outwardly from opposite ends of the web.
- the flange 11 is referred to herein as a "first" flange and it has a width which is narrower than the "second" wider flange 12, as can best be seen from Figure 2.
- the first, narrower flange 11 is formed with a lip 13 which is inclined at an angle ⁇ j of approximately 90° to the plane of the flange 11, and the second, wider flange 12 is formed with a lip 14 which is inclined at an angle ⁇ 2 of approximately 120° to the plane of the flange 12.
- the first flange 11 might typically have a nominal width in the order of 65 mm to 70 mm and the second flange 12 might have a nominal (overall) width in the order of 75 mm to 80 mm.
- the lip 13 associated with the first flange 11 might then have a nominal (overall) width in the order of 20 mm to 30 mm, and the lip 14 associated with the second flange 12 might have a nominal width in the order of 25 mm to 30 mm.
- Each of the lips 13 and 14 is formed with a respective lip return 15 and 16.
- the lip return 15 is inclined at an angle j of approximately 90° with respect to the lip 13, and the lip return 16 is inclined at an angle 0 of approximately 60° with respect to the lip 14.
- the respective flanges, associated lips and lip returns are dimensioned and angularly disposed so that the narrower flange 11 nests within the wider flange 12 when two of the purlins are joined together in overlapping relationship.
- the lip return 15 might typically have a nominal (overall) dimension in the order of 10 mm to 15 mm and the lip return 16 might typically have a nominal (overall) dimension in the order of 10 mm to 15 mm and the lip return 16 might typically have a nominal (overall) dimension in the order of 10 mm to 15 mm and the lip return 16 might typically have a nominal (overall) dimension in the order of 10 mm to 15 mm and the lip return 16 might typically have a nominal (overall) dimension in the order of 10 mm to 15 mm and the lip return 16 might typically have a nominal
- the web 10 is formed with four longitudinally extending channel-shaped recesses 17.
- Each recess has an arcuate form and each recess has a depth in the order of 0.5 to 3.0 times the thickness of the metal from which the purlin is formed.
- the recesses 17 are orientated such that, when two of the structural members are connected in overlapping relationship as shown in Figure 2, the channel-shaped recesses in the respective webs 10 form complementary portions of longitudinally extending tunnels 18.
- Curve A in Figure 4 is a graph of buckling stress against buckle half-wavelength for a standard (prior art) Z-section purlin when subjected to bending in a manner to place the wider flange of the purlin in uniform compression and the narrower flange in uniform tension.
- Curve B in Figure 4 is a graph of buckling stress against buckle half-wavelength for a Z-section purlin of the type shown in Figure 1 when subjected to bending in a manner to place the wider flange of the purlin in uniform compression and the narrower flange in uniform tension.
- Curve A in Figure 5 is a graph of buckling stress against buckle half-wavelength for a standard (prior art) Z-section purlin when subjected to bending in a manner to place the narrow flange of the purlin in uniform compression and the wider flange in uniform tension.
- Curve B in Figure 5 is a graph of buckling stress against buckle half-wavelength for a Z-section purlin of the type shown in Figure 1 when subjected to bending in a manner to place the narrow flange of the purlin in uniform compression and the wider flange in uniform tension.
- the buckling resistance of the Z-section purlin in accordance with the present invention when subjected to bending which puts one flange in compression and the other in tension, is superior to the buckling resistance of the standard (prior art) purlin when subjected to the same stress distribution.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU15370/97A AU707074B2 (en) | 1996-02-02 | 1997-01-30 | Z-section structural member |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPN7862A AUPN786296A0 (en) | 1996-02-02 | 1996-02-02 | Z-section structural member |
AUPN7862 | 1996-02-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997028326A1 true WO1997028326A1 (en) | 1997-08-07 |
Family
ID=3792178
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU1997/000053 WO1997028326A1 (en) | 1996-02-02 | 1997-01-30 | Z-section structural member |
Country Status (5)
Country | Link |
---|---|
CN (1) | CN1212037A (en) |
AU (1) | AUPN786296A0 (en) |
ID (1) | ID15920A (en) |
MY (1) | MY119141A (en) |
WO (1) | WO1997028326A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998049409A1 (en) * | 1997-04-30 | 1998-11-05 | Weeks Peacock Quality Homes Pty. Ltd. | A structural member |
US20150101280A1 (en) * | 2012-07-11 | 2015-04-16 | Metroll Technology Pty Ltd | Structural Element |
AU2010324521B2 (en) * | 2009-11-27 | 2016-05-05 | Metroll Technology Pty Ltd | Structural element |
US20190323282A1 (en) * | 2018-04-18 | 2019-10-24 | Assa Abloy Entrance Systems Ab | Strut for windload door |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU6755960A (en) * | 1960-12-14 | 1962-12-20 | National Steal Corporation | Structural member |
US3841047A (en) * | 1972-05-30 | 1974-10-15 | D Zinn | Studs |
GB1566701A (en) * | 1975-09-27 | 1980-05-08 | Ti Metsec Ltd | Purlins |
GB1590435A (en) * | 1976-07-28 | 1981-06-03 | T I Metsec Ltd | Sleeve or lapped joints in purlin assemblies |
EP0080250A2 (en) * | 1981-11-23 | 1983-06-01 | Ayrshire Metal Products public limited company | Improvements in purlins |
US4461134A (en) * | 1981-07-06 | 1984-07-24 | Lowe Colin F | Sheet metal beam |
GB2181467A (en) * | 1985-08-24 | 1987-04-23 | Hadley Sections Limited | Elongate sections |
US5079884A (en) * | 1990-06-04 | 1992-01-14 | National Gypsum Company | Extendible interconnected Z-studs |
AU1624792A (en) * | 1991-08-07 | 1993-02-11 | Force 10 International Pty Ltd | Jointing of structural members |
-
1996
- 1996-02-02 AU AUPN7862A patent/AUPN786296A0/en not_active Abandoned
-
1997
- 1997-01-30 CN CN97192563A patent/CN1212037A/en active Pending
- 1997-01-30 WO PCT/AU1997/000053 patent/WO1997028326A1/en active Application Filing
- 1997-01-31 MY MYPI97000381A patent/MY119141A/en unknown
- 1997-02-03 ID IDP970320A patent/ID15920A/en unknown
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU6755960A (en) * | 1960-12-14 | 1962-12-20 | National Steal Corporation | Structural member |
US3841047A (en) * | 1972-05-30 | 1974-10-15 | D Zinn | Studs |
GB1566701A (en) * | 1975-09-27 | 1980-05-08 | Ti Metsec Ltd | Purlins |
GB1590435A (en) * | 1976-07-28 | 1981-06-03 | T I Metsec Ltd | Sleeve or lapped joints in purlin assemblies |
US4461134A (en) * | 1981-07-06 | 1984-07-24 | Lowe Colin F | Sheet metal beam |
EP0080250A2 (en) * | 1981-11-23 | 1983-06-01 | Ayrshire Metal Products public limited company | Improvements in purlins |
GB2181467A (en) * | 1985-08-24 | 1987-04-23 | Hadley Sections Limited | Elongate sections |
US5079884A (en) * | 1990-06-04 | 1992-01-14 | National Gypsum Company | Extendible interconnected Z-studs |
AU1624792A (en) * | 1991-08-07 | 1993-02-11 | Force 10 International Pty Ltd | Jointing of structural members |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998049409A1 (en) * | 1997-04-30 | 1998-11-05 | Weeks Peacock Quality Homes Pty. Ltd. | A structural member |
AU2010324521B2 (en) * | 2009-11-27 | 2016-05-05 | Metroll Technology Pty Ltd | Structural element |
US20150101280A1 (en) * | 2012-07-11 | 2015-04-16 | Metroll Technology Pty Ltd | Structural Element |
US20190323282A1 (en) * | 2018-04-18 | 2019-10-24 | Assa Abloy Entrance Systems Ab | Strut for windload door |
WO2019201978A1 (en) * | 2018-04-18 | 2019-10-24 | Assa Abloy Entrance Systems Ab | Strut for windload door |
Also Published As
Publication number | Publication date |
---|---|
AUPN786296A0 (en) | 1996-02-29 |
MY119141A (en) | 2005-04-30 |
ID15920A (en) | 1997-08-21 |
CN1212037A (en) | 1999-03-24 |
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