AU2018220145B2 - Decking Sheet - Google Patents
Decking Sheet Download PDFInfo
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- AU2018220145B2 AU2018220145B2 AU2018220145A AU2018220145A AU2018220145B2 AU 2018220145 B2 AU2018220145 B2 AU 2018220145B2 AU 2018220145 A AU2018220145 A AU 2018220145A AU 2018220145 A AU2018220145 A AU 2018220145A AU 2018220145 B2 AU2018220145 B2 AU 2018220145B2
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- decking sheet
- stiffening
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- decking
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Abstract
:
A decking sheet (3) is disclosed. The decking sheet
includes an elongate channel that is generally U-shaped in
5 transverse section with a top wall (5) and side walls (7)
extending downwardly from opposed lengthwise side edges of
the top wall, with the decking sheet having an upward
camber along the length of the decking sheet.
10595249_1 (GHMatters) P105867.AU.1
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Description
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Field of the Invention
The invention relates to a decking sheet.
The invention relates particularly, although not exclusively, to a decking sheet that is suitable for use as part of a composite floor system.
The invention relates particularly, although not exclusively, to a decking sheet that is roll-formed from steel strip.
The invention relates particularly, although not exclusively, to a composite floor slab that includes the decking sheet and a layer of concrete or other settable material on the decking sheet.
Background of the Invention
Known decking sheets for use in composite floor slabs are in the form of a roll-formed elongate channel that is generally U-shaped in transverse section with a top wall and side walls extending downwardly from opposed lengthwise-extending side edges of the top wall.
The side walls of the decking sheet may include side edge formations that allow adjacent decking sheets to be positioned in side-by-side overlapping relationship.
The top wall and/or the side wall of the decking sheet may include stiffening formations.
The side walls of the decking sheet may include complementary side edge formations that allow adjacent decking sheets to be positioned together in side-by-side overlapping relationship.
The above description is not to be taken to be an admission of the common general knowledge in Australia or elsewhere.
Summary of the Invention
The invention provides a decking sheet that has an upward camber that is pre-formed in the decking sheet as part of the method of manufacturing the decking sheet. The upward pre-camber reduces decking downward deflections after applying loads to the decking sheet, thus increasing spanning capabilities and/or reducing the amount/grade of steel required for a particular span length. The increased spanning capability allows the decking sheet to be used in longer spans than is the case with known decking sheets. The upward pre-camber may be achieved by using stiffening formations which are arranged in a way that draws in longitudinally more steel below a neutral axis as compared to steel drawn in above the neutral axis during a roll forming process, thus forcing the profile upwards during the roll forming process. In other words, the rolling forming process shortens the deck length below the neutral axis compared to the deck length above the neutral axis.
The invention provides a decking sheet that includes an elongate channel that is generally U-shaped in transverse section with a top wall and side walls extending downwardly from opposed lengthwise side edges of the top wall, with the decking sheet having an upward camber along the length of the decking sheet.
Each side wall may include a main plane and stiffening formations extending from the main plane and spaced apart along at least a part of the length of the decking sheet, with the stiffening formations being formed so that there is a greater surface area of each side wall that is deformed from the main plane below a neutral axis of the decking sheet as described herein than the surface area of each side wall that is deformed from the main plane above the neutral elongate axis so that the decking sheet is forced to bow upwardly and form the upward camber.
It can readily appreciated that the greater surface area of each side wall that is deformed from the main plane below than above the neutral axis of the decking sheet means that the side walls of the decking sheet are progressively pulled inwardly along the length of the decking sheet below the neutral axis compared to above the neutral axis. This greater deformation below compared to above the neutral axis shortens the deck length below the neutral axis compared to the deck length above the neutral axis and therefore means that the decking sheet bows upwardly and forms the upward camber.
The term "upward camber" is understood herein to mean that the camber is a convex profile when viewed from a side of the channel.
The term "neutral axis" of the decking sheet is understood herein to mean a line or a plane through the decking sheet at which no extension or compression occurs when the decking sheet is bent.
In at least one embodiment, therefore, the invention provides a decking sheet that includes an elongate channel that is generally U-shaped in transverse section with a top wall and side walls extending downwardly from opposed lengthwise side edges of the top wall, with the decking sheet having an upward camber along the length of the decking sheet. Each side wall includes a main plane and stiffening formations that extend from the main plane and are spaced apart along at least a part of the length of the decking sheet. The stiffening formations are formed in the side walls so that a greater surface area of each side wall is deformed from the main plane below a neutral axis of the decking sheet than a surface area of each side wall that is deformed from the main plane above the neutral axis, whereby the decking sheet is forced to bow upwardly to pre-form the upward camber.
The decking sheet may include a single elongate channel.
The decking sheet may include a plurality of parallel elongate channels. With this arrangement, adjacent channels may be interconnected by pans.
The upward camber may be any suitable radius.
Typically, the radius of the upward camber is at least 50m. A radius of 50m is equivalent to a 125mm pre camber for a 5m long span.
The radius of the upward pre-camber may be selected as required having regard to the structural requirements of the decking sheet 3.
There may be stiffening formations that extend transversely to the length of the channel with a part of the stiffening formations being above the neutral axis and another part of the stiffening formations being below the neutral axis.
Any one or more of the length, depth, and width of one or more than one of the stiffening formations may be selected as required so that there is a greater surface area of each side wall that is deformed from the main plane below the neutral axis than above the neutral axis.
For example, each stiffening formation may have a length, a depth relative to the main plane of the side wall, and a width, with each stiffening formation extending transversely to the length of the decking sheet with a part of the stiffening formation being above a neutral elongate axis of the decking sheet as described herein and another part of the stiffening formation being below the neutral axis, with one or more than one stiffening formation having a variable depth and/or a variable width with a larger depth and/or larger width and/or a longer length of the section in the part below the neutral axis compared to the depth and/or the width above the neutral axis that causes the decking sheet to form the upward camber.
The stiffening formation may have a variable depth.
The stiffening formation may have a variable width.
The stiffening formation may have a variable depth and a variable width.
The stiffening formation may have a thermometer shape when viewed from a side of the channel, with a bulbous lower end below the neutral axis and a uniform width stem.
The stiffening formation may have a dog-bone shape when viewed from a side of the channel with a bulbous lower end below the neutral axis, a bulbous upper end above the neutral axis, and a uniform width stem.
The depth of the stiffening formation may be any depth up to 3.5mm, typically up to 5mm, and more typically up to 10mm.
When the stiffening formation has a variable depth, the depth may be any depth up to 3mm, typically up to 3.5mm, typically up to 5mm, and more typically up to 10mm. By way of example, the depth may increase from zero depth at one end of the stiffening formation to be up to 3mm, typically up to 3.5mm, typically up to 5mm, and more typically up to 10mm at the other end of the stiffening formation.
The width of the stiffening formation may be any width between 5-50mm. In situations where the stiffening formation has a constant width along the length of the stiffening formation, typically the width is between 5 25mm, more typically 5-15mm.
The length of the stiffening formation may be at least 45% of the shortest distance between the lower ends of the side walls and the top wall of the channel.
The length of the stiffening formation may be at least 50% of the shortest distance between the lower ends of the side walls and the top wall of the channel.
The length of the stiffening formation may be less than 75%, typically less than 70%, of the shortest distance between the lower ends of the side walls and the top wall of the channel.
The height of the decking sheet may be at least 8cm, typically at least 15cm, typically at least 18cm, and more typically at least 20cm.
The height of the decking sheet may be less than 35cm.
The height of the decking sheet may be 8-35cm.
The height of the decking sheet may be 8-30cm.
The height of the decking sheet may be 11-25cm.
The height of the decking sheet may be 15-25cm.
The height of the decking sheet may be 18-22cm.
The width of the decking sheet may be any suitable width. The width of the decking sheet may be at least 50cm, typically at least 55 cm, and less than 1.20m and more typically less than 1.5m.
The decking sheet may be any suitable span length, where span length is understood to be the distance between supports for the decking sheets. Span lengths may be at least 4m. The span lengths may be up to 7m or higher, typically at least 8m, and more typically at least 9m.
There may be stiffening formations that are below the neutral axis and do not extend above the neutral axis.
There may be a combination of both types of stiffening formations, i.e. (a) stiffening formations below and above the neutral axis and (a) stiffening formations that are only below the neutral axis.
The stiffening formations may include: (a) a first set of stiffening formations extending transversely to the length of the channel with a part of each stiffening formation being above the neutral axis and another part of the stiffening formation being below the neutral axis, with the stiffening formations of the first set being formed so that there is the same surface area of each side wall that is deformed from the main plane below and above the neutral axis; and (b) a second set of stiffening formations only below the neutral axis so that there is a greater surface area of each side wall that is deformed from the main plane below the neutral axis of the channel than the surface area of each side wall that is deformed from the main plane above the neutral axis.
With the arrangement described in the preceding paragraph, the second set of stiffening formations causes the channel to bow upwardly and form the upward camber.
Any one or more of the length, depth, and width of the first set of stiffening formations may be selected as required so that there is the same surface area of each side wall that is deformed from the main plane below and above the neutral axis.
The side walls may include complementary side edge formations that allow adjacent decking sheets to be positioned together in side-by-side overlapping relationship.
The decking sheet may be a roll formed decking sheet, produced from sheet, typically steel sheet.
The invention also provides a composite floor slab that includes the above-described decking sheet as formwork of the slab and a layer of concrete or other settable material on the decking sheet.
The composite floor slab includes a plurality of the decking sheet arranged in side by side overlapping relationship.
The composite floor slab includes an underlying support framework.
Brief Description of the Drawings
The invention is now described, by way of example only, with reference to the accompanying drawings, of which:
Figure 1 is a top perspective view of one embodiment of a decking sheet in accordance with the invention;
Figure 2 is another top perspective view of the decking sheet;
Figure 3 is another perspective view of the decking sheet showing an underside of the decking sheet;
Figure 4 is a top plan view of the decking sheet;
Figure 5 is a side view of the decking sheet;
Figure 6 is an end view of the decking sheet;
Figure 7 is a side view of a part of the length of the decking sheet that illustrates stiffening formations in that part of the length;
Figure 8 is a top view of a part of the length of the decking sheet that illustrates stiffening formations in that part of the length;
Figure 9 is a side view of one of the stiffening formations in the side walls of the decking sheet shown in Figure 5; and
Figure 10 is a series of side views of other embodiments of stiffening formations in the side walls of other embodiments of decking sheets in accordance with the invention.
Detailed Description of the Embodiments
The decking sheet of the invention has an upward camber that is pre-formed in the decking sheet as part of the method of manufacturing the decking sheet.
The upward pre-camber reduces decking downward deflections after applying loads to the decking sheet, thus increasing spanning capabilities and/or reducing the amount/grade of steel required for a particular span length. The increased spanning capability allows the decking sheet to be used in longer spans than is the case with known decking sheets.
The pre-camber has a radius of at least 50m. A radius of 50m is equivalent to a 125mm pre-camber for a 5m long span. The pre-camber feature of the invention provides significant advantages.
The embodiments of the decking sheet 3 of the invention shown in the Figures are illustrative only of a larger number of embodiments of the invention.
The perspective, side and top plan views of the decking sheet 3 of Figures 1-5 illustrate a part only of the length of the decking sheets.
The embodiments of the decking sheet 3 are described in the context of being used as a component of a composite floor slab. In this application, typically, a plurality of the decking sheet is mounted in side-by-side overlapping relationship to an underlying support framework to define a base of a formwork for the composite floor slab and concrete is then poured onto the decking sheets to complete the construction of the composite floor slab. The composite floor slab may include reinforcement, such as steel wire mesh embedded in the concrete. The invention is not limited to this application.
The decking sheet 3 shown in the Figures is roll formed from 990mm wide G550 grade (for 1mm base metal thickness) to G450 grade (for 1.5mm base metal thickness) high tensile steel strip. The decking sheet 3 is not confined to these width, thickness and steel grades and may be manufactured from any suitable width and thickness steel strip having any suitable mechanical properties.
The advantages of the pre-camber feature of the specific decking sheet 3 shown in the Figures and of the invention more generally are as follows:
Pre camber results in significant additional efficiency of the decking sheet 3 when used as formwork of a composite floor slab since the formwork performance is governed normally by deflections and the pre-camber feature performs well in this area. In particular, the pre-camber feature facilitates: - extra spanning capacity since pre-camber reduces formwork deflections and/or:
- reduced base metal thickness of the decking sheet 3.
Pre camber is achieved by structural features of the decking sheet 3, particularly (but not limited to) transverse stiffening formations (which could also be described as embossments) in the side walls of the decking sheet 3. These are multiple purpose formations, with one purpose being to stiffen the side walls, another purpose being to provide mechanical interlocks between the decking sheet 3 and concrete in a composite floor slab, and another purpose that is relevant in the context of the invention being to force the decking sheet 3 to bow upwardly along its length and thereby form the upward pre-camber. This third purpose is achieved by deliberately forming the stiffening formations so that they shorten the length of the decking sheet 3 below the neutral axis of the decking sheet, thereby making the decking sheet 3 camber upwards. As described further below, the upward camber is achieved at least in part in the embodiments in the Figures by the transverse stiffening formations having 2nd order variable geometry within the length of a single stiffening formation. This 2 nd order variable geometry involves particular shape selections of the stiffening formations. The variables include but are not limited to increased overall depth and width of the cross section of the stiffening formation and shorter radii of cross sectional shape, and length. As also described further below, the upward camber is achieved at least in part in some embodiments in the Figures by providing transverse stiffening formations below a neutral elongate axis of the decking sheet 3.
With reference to the Figures, the decking sheet 3 is an elongate channel member that is generally U-shaped in transverse section with a top wall 5 and side walls 7 extending downwardly from opposed lengthwise side edges 9 of the top wall 5, with the channel having an upward camber along the length of the decking sheet 3. The upward camber is not readily visible in the Figures. Nevertheless, the upward camber is such that the decking sheet 3 is convex when viewed from a side, with the decking sheet curving upwardly from opposite ends to the mid-point of the length of the decking sheet 3.
The height of the decking sheet 3 is at least 8cm, typically at least 15cm, typically at least 18cm, and more typically at least 20cm, and typically less than 25cm.
The width of the decking sheet 3 is at least 50cm, typically at least 55 cm, and more typically less than 65 cm. It is noted that the decking sheet 3 may be considerably wider. For example, the decking sheet 3 may be up to 1.5m wide.
The decking sheet 3 has a neutral elongate axis. As indicated above, the term "neutral axis" of the decking sheet 3 is understood herein to mean a line or a plane through the decking sheet 3 at which no extension or compression occurs when the decking sheet 3 is bent. The neutral axis is not marked in the Figures. Typically, the neutral axis will be approximately mid-way the height of the decking sheet 3.
The top wall 5 of the decking sheet 3 has a central lengthwise extending raised elongate rib 17 and two outer lengthwise extending panels 21. The rib 17 is a wide rib, approximately 50% of the width of the top wall 5.
The rib 17 has a V-shaped elongate rib 19 centrally positioned in the rib 17 that separates the rib 17 into two parallel sections. The rib 17 also includes a series of upwardly formed embossments 23 in the shape of the letter "K" spaced across and along the length of the panels of the rib 17.
Each outer panel 21 of the top wall 5 has a centrally-positioned lengthwise extending rib 25 that separate the outer panel 21 into two parallel sections.
The lengthwise extending transitions between the raised rib 17 and the outer panels 21 of the top wall 7 are in the form of re-entrant sections 37 (see Figure 6). The re-entrant sections 37 include a series of embossments 39 at spaced intervals along the length of the re-entrant sections 37. These embossments 39 are relatively small outward formations, typically up to 4-6mm beyond adjacent regions of the re-entrant sections 37. The embossments 39 are of the type disclosed in Australian patent 2002325634 in the name of University of Western Sydney and Metal Forming Technologies Pty Ltd. The disclosure in the Australian patent is incorporated herein by cross reference.
The ribs 17, 19, 25, the re-entrant sections 37, and the embossments 23, 37 contribute to the strength of the top wall 5 of the decking sheet 3.
The side walls 7 include complementary male and female side edge formations 35a, 35b extending along lower edges of the side walls 7 that allow adjacent decking sheets 3 to be positioned in side-by-side overlapping relationship. The top wall of the female side edge formation 35b also includes a series of the above described embossments 39 at spaced intervals along the length of the female side edge formation 35b.
Each side wall 7 also includes a lengthwise extending central panel 31, an upper lengthwise extending transition 29 between the side edge 9 of the top wall 5 and the central panel 31, and a lower lengthwise extending transition 27 between the side edge formations 35 and the central panel 31.
Each side wall 7 includes a lengthwise extending kink 41 (see Figure 6), which can also be described as a shoulder, that separates (a) the upper transition 29 and the central panel 31 and the central panel 31 and the lower transition 27. The kinks 41 are longitudinal stiffeners.
The lower transition 27 also includes a series of the above-described embossments 39 at spaced intervals along the length of the transition 27.
The central panel 31 of each side wall 7 includes a main plane 11 and stiffening formations 13 that are deformed outwardly from the main plane 11.
The stiffening formations 13 in the side walls 7 are spaced apart along at least a part of the length of the decking sheet 3. As is evident from Figures 1-3, in the described embodiment the stiffening formations 13 are uniformly spaced apart along the whole of the length of the decking sheet 3. The invention is not limited to this arrangement. The spacing of the stiffening formations 13 along the length of the decking sheet 3 may vary. In addition, the stiffening formations 13 may be in a part only of the length of the decking sheet 3.
The stiffening formations 13 in the side walls 7 are formed so that there is a greater surface area of each side wall 7 that is deformed from the main plane 11 below the neutral axis of the decking sheet 3 than the surface area of each side wall 7 that is deformed from the main plane 11 above the neutral axis. The inevitable consequence of this difference in deformation above and below the neutral axis is that the decking sheet 3 is forced to bow upwardly and form the upward camber.
It is noted that the selection of the structure (i.e. profile, number and location) of the stiffening formations 13 to provide a selected upward camber is in the context of the overall structure of the decking sheet 3. Specifically, in the context that the ribs 17, 19, 25, the re-entrant sections 37, and the embossments 23, 37, and all other deformed sections of the top wall 5 and the side walls 7 of the decking sheet 3 above and below the neutral axis are relevant to and need to be taken into account when assessing the structure of the decking sheet that is required to roll-form the decking sheet 3 with a selected upward pre-camber.
Having considered the overall structure of the decking sheet 3, any one or more of the length, depth, and width of one or more than one of the stiffening formations 13 may be selected as required so that there is a greater surface area of each side wall 7 that is deformed from the main plane 11 below the neutral axis than above the neutral axis. There are numerous options for producing this result. These options include, by way of example, (a) selecting the length of one or more stiffening formations 13 so that more than 50% of the length is below the neutral axis and/or (b) forming one or more stiffening formations 13 to have a greater depth below the neutral axis than above the neutral axis and/or (c) forming one or more stiffening formations 13 to have a greater width below the neutral axis than above the neutral axis.
Figures 7 to 10 illustrate a range of options for the stiffening formations 13 in the side walls.
Figure 7 illustrates three of the stiffening formations 13 in one of the side walls 7. These and the other stiffening formations 13 at spaced intervals along the length of the side walls 7 have the same length and a variable depth and a constant width along the length of each formation 13. The variable depth of the stiffening formations 13 shown in Figure 7 is illustrated in Figure 8. This Figure is a view of one of the stiffening formations 13 from one end of the decking sheet 3. Figure 8 illustrates that the depth of the stiffening formation 13 progressively increases from zero depth relative to the main plane 11 at an upper end to a maximum depth relative to the main plane 11 at a lower end. In this embodiment, the maximum depth is 3.5mm. It is noted that this particular maximum depth is by way of example only. It can be appreciated that the impact of the increased depth is to reduce the effective length of the lower section of the side walls 7 compared to the upper sections of the side walls 7 because more steel strip is deformed outwardly from the plane 11, with the result that the decking sheet 3 is caused to bow upwardly.
The depth of the stiffening formations 13 varies from zero at the upper end to 3.5 mm at the lower end.
The width of the stiffening formations 13 is between 5-15 mm. It is noted that this particular width range is by way of example only.
Figure 10 illustrates four, although not the only, other possible options, for the stiffening formations 13 in the side walls 7 of the decking sheet 3.
The stiffening formations 13a, 13b, 13c in Figure 10 are in the form of thermometers (two of which are shown and identified by the numerals 13a, 13b) and a dogbone (identified by the numeral 13c) and have a variable width along the length of the stiffening formations 13 from the upper ends to the lower ends of the formations 13. The thermometers (13a, 13b), when viewed from a side of the decking sheet 3, have a bulbous lower end below the neutral axis and a uniform width stem. The dogbone (13c), when viewed from a side of the decking sheet 3, has a bulbous lower end below the neutral axis, a bulbous upper end above the neutral axis, and a uniform width stem.
The stiffening formations 13d, 13e in Figure 10 are an example of a combination of two types of stiffening formations 13. Specifically, the Figure illustrates: (a) a first set of stiffening formations 13d extending transversely to the length of the channel with a part of each stiffening formation 13d being above the neutral axis and another part of the stiffening formation 13d being below the neutral axis, with the stiffening formations of the first set being formed so that there is the same surface area of each side wall that is deformed from the main plane below and above the neutral axis; and (b) a second set of stiffening formations 13 which are entirely below the neutral axis so that there is a greater surface area of each side wall 7 that is deformed from the main plane 11 below the neutral axis of the channel than the surface area of each side wall 7 that is deformed from the main plane 11 above the neutral axis.
With the arrangement described in the preceding paragraph, the second set of stiffening formations 13e causes the decking sheet 3 to bow upwardly and form the upward camber.
When the decking sheet 3 is used as formwork of a composite floor slab the following structural features contribute to the performance of the decking sheet 3:
• The stiffening formations 13 in the side walls 7 perform as described above. Specifically, the stiffening formations 13 improve formwork performance by stiffening the side walls 7, providing mechanical interlocks between the decking sheet 3 and concrete in a composite floor slab, and forcing the decking sheet 3 to bow upwardly along its length and thereby form the upward pre-camber. • The embossments 39 improve composite actions in general - improving formwork performance due to stiffening the top rib 17. • The raised rib 17 in the top wall 5 improves formwork performance significantly by being a major longitudinal stiffener. • The raised rib 17 improves formwork performance by placing the raised rib 17 and the outer panels 21 of the top wall 5 relatively close to each other and such that the top steel is at maximum distance from the neutral axis without compromising buckling resistance. • The long radii (typically 20-25mm) of the opposed lengthwise side edges 9 of the top wall 5 improves formwork performance (smaller flats length, higher buckling stress) and at the same time requires less feed width/more efficient steel usage/moving steel to locations where it is most efficient - webs and stiffeners. • The two longitudinal stiffeners (kinks 41) of each side wall 7 improve significantly formwork performance, in particular for shorter spans/high loads where shear/bearing capacity is important. • The complementary side edge formations 35 improves composite and fire performance significantly due to the embossments 39.
Many modifications may be made to the embodiments of the present invention described above with reference to the Figures without departing from the spirit and scope of the present invention.
The above description of the embodiments of the present invention mentions a number of possible modifications to the embodiments.
In addition, by way of example, whilst the embodiments of the decking sheet described with reference to the Figures are a single elongate channel member, the invention is not so limited and extends to decking sheets that have multiple elongate channel members.
By way of further example, whilst the embodiments of the decking sheet described with reference to the Figures are roll-formed, the invention is not so limited and extends to any suitable methods of forming decking sheets 3 with upward pre-camber.
Claims (28)
1. A decking sheet that includes an elongate channel that is generally U-shaped in transverse section with a top wall and side walls extending downwardly from opposed lengthwise side edges of the top wall, with the decking sheet having an upward camber along the length of the decking sheet, wherein each side wall includes a main plane and stiffening formations extending from the main plane and spaced apart along at least a part of the length of the decking sheet, wherein the stiffening formations are formed in the side walls so that a greater surface area of each side wall is deformed from the main plane below a neutral axis of the decking sheet than a surface area of each side wall that is deformed from the main plane above the neutral axis, whereby the decking sheet is forced to bow upwardly to pre-form the upward camber.
2. The decking sheet defined in claim 1, wherein there are stiffening formations that extend transversely to the length of the channel with a part of the stiffening formations being above the neutral axis and another part of the stiffening formations being below the neutral axis.
3. The decking sheet defined in claim 1 or claim 2, wherein any one or more of a length, depth, and width of one or more than one of the stiffening formations is selected as required to provide the greater surface area of each side wall that is deformed from the main plane below the neutral axis than above the neutral axis.
4. The decking sheet defined in claim 3, wherein each stiffening formation has a length, a depth relative to the main plane of the side wall, and a width, with each stiffening formation extending transversely to the length of the channel with a part of the stiffening formation being above a neutral elongate axis of the channel and another part of the stiffening formation being below the neutral axis, wherein one or more than one stiffening formation has a variable depth and/or a variable width with a larger depth and/or a larger width and/or a longer section of length in the part below the neutral axis compared to the depth and/or the width above the neutral axis.
5. The decking sheet defined in claim 4, wherein the stiffening formation has a variable depth.
6. The decking sheet defined in claim 4 or claim 5, wherein the stiffening formation has a variable width.
7. The decking sheet defined in any one of claims 4 to 6, wherein the stiffening formation has a variable depth and a variable width.
8. The decking sheet defined in any one of claims 4 to 7, wherein the stiffening formation has a thermometer shape when viewed from a side of the channel, with a bulbous lower end below the neutral axis and a uniform width stem.
9. The decking sheet defined in any one of claims 4 to 7, wherein the stiffening formation has a dog-bone shape when viewed from a side of the channel with a bulbous lower end below the neutral axis, a bulbous upper end above the neutral axis, and a uniform width stem.
10. The decking sheet defined in any one of claims 4 to 9, wherein the depth of the stiffening formation is any depth up to 10mm.
11. The decking sheet defined in any one of claims 4 to 9, wherein, when the stiffening formation has a variable depth, the depth is any depth up to 3mm, typically up to 3.5mm, typically up to 5mm, and more typically up to 10mm.
12. The decking sheet defined in claim 11, wherein the depth increases from no depth at one end of the stiffening formation to be up to 3mm, typically up to 3.5mm, typically up to 5mm, and more typically up to 10mm at the other end of the stiffening formation.
13. The decking sheet defined in any one of claims 4 to 12, wherein the width of the stiffening formation is any width between 5-15mm.
14. The decking sheet defined in any one of claims 4 to 13, wherein the length of the stiffening formation is at least 70% of the shortest distance between the lower ends of the side walls and the top wall of the channel.
15. The decking sheet defined in any one of claims 4 to 13, wherein the length of the stiffening formation is at least 75% of the shortest distance between the lower ends of the side walls and the top wall of the channel.
16. The decking sheet defined in any one of the preceding claims, wherein the height of the channel is at least 8cm.
17. The decking sheet defined in any one of the preceding claims, wherein the height of the channel is less than 35cm.
18. The decking sheet defined in any one of the preceding claims, wherein the height of the channel is 8-25cm.
19. The decking sheet defined in any one of the preceding claims, wherein the height of the channel is 18-22cm.
20. The decking sheet defined in any one of the preceding claims, wherein there are stiffening formations below the neutral axis that do not extend above the neutral axis.
21. The decking sheet defined in claim 20, wherein there is a combination of (a) stiffening formations that are below and above the neutral axis and (a) stiffening formations that are only below the neutral axis.
22. The decking sheet defined in any one of the preceding claims, wherein the stiffening formations include: (a) a first set of stiffening formations extending transversely to the length of the channel with a part of each stiffening formation being above the neutral axis and another part of each stiffening formation being below the neutral axis, with the stiffening formations of the first set being formed so that there is the same surface area of each side wall that is deformed from the main plane below and above the neutral axis; and (b) a second set of stiffening formations formed only below the neutral axis so that there is a greater surface area of each side wall that is deformed from the main plane below the neutral axis than the surface area of each side wall that is deformed from the main plane above the neutral axis.
23. The decking sheet defined in claim 22, wherein any one or more of the length, depth, and width of the first set of stiffening formations is selected as required so that there is the same surface area of each side wall that is deformed from the main plane below and above the neutral axis.
24. The decking sheet defined in any one of the preceding claims, wherein the side walls include complementary side edge formations that allow adjacent decking sheets to be positioned together in side-by-side overlapping relationship.
25. The decking sheet defined in any one of the preceding claims, wherein the decking sheet is roll formed from sheet.
26. The decking sheet defined in any one of the preceding claims, having a span length of at least 4m, typically at least 5m, typically at least 7m, typically at least 8m, and more typically at least 9m.
27. A composite floor slab that includes the decking sheet defined in any one of the preceding claims as formwork of the slab and a layer of concrete or other settable material on the decking sheet.
28. The composite floor system defined in claim 27, including a plurality of the decking sheet arranged in side by side overlapping relationship.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2017903437 | 2017-08-25 | ||
| AU2017903437A AU2017903437A0 (en) | 2017-08-25 | Decking Sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2018220145A1 AU2018220145A1 (en) | 2019-03-14 |
| AU2018220145B2 true AU2018220145B2 (en) | 2024-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2018220145A Active AU2018220145B2 (en) | 2017-08-25 | 2018-08-24 | Decking Sheet |
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| Country | Link |
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| AU (1) | AU2018220145B2 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056348A (en) * | 1989-06-01 | 1991-10-15 | Robertson-Ceco Corporation | Method of making a profiled sheet metal building unit |
| WO2004065713A1 (en) * | 2003-01-23 | 2004-08-05 | Onesteel Reinforcing Pty Ltd | Structural decking system |
| US20140318056A1 (en) * | 2012-05-09 | 2014-10-30 | Farid Abugattas | Prestressed, cambered and composite cellular steel decking floor system |
| WO2016117753A1 (en) * | 2015-01-23 | 2016-07-28 | 서울시립대학교 산학협력단 | Tendon anchor system of long span fire-resistant deck prestressed and anchored on deck end part, and construction method thereof |
| KR20160091475A (en) * | 2015-01-23 | 2016-08-03 | 서울시립대학교 산학협력단 | Tendon fixing system of long span fire resistance deck strained at beam and construction method of the same |
| KR20160119649A (en) * | 2015-04-06 | 2016-10-14 | 동양 알.피.에프 산업(주) | Deck and concrete slab construction method using of the same |
-
2018
- 2018-08-24 AU AU2018220145A patent/AU2018220145B2/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5056348A (en) * | 1989-06-01 | 1991-10-15 | Robertson-Ceco Corporation | Method of making a profiled sheet metal building unit |
| WO2004065713A1 (en) * | 2003-01-23 | 2004-08-05 | Onesteel Reinforcing Pty Ltd | Structural decking system |
| US20140318056A1 (en) * | 2012-05-09 | 2014-10-30 | Farid Abugattas | Prestressed, cambered and composite cellular steel decking floor system |
| WO2016117753A1 (en) * | 2015-01-23 | 2016-07-28 | 서울시립대학교 산학협력단 | Tendon anchor system of long span fire-resistant deck prestressed and anchored on deck end part, and construction method thereof |
| KR20160091475A (en) * | 2015-01-23 | 2016-08-03 | 서울시립대학교 산학협력단 | Tendon fixing system of long span fire resistance deck strained at beam and construction method of the same |
| KR20160119649A (en) * | 2015-04-06 | 2016-10-14 | 동양 알.피.에프 산업(주) | Deck and concrete slab construction method using of the same |
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|---|---|
| AU2018220145A1 (en) | 2019-03-14 |
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