AU671193B2 - Joints between thin sheet metal structural members - Google Patents
Joints between thin sheet metal structural members Download PDFInfo
- Publication number
- AU671193B2 AU671193B2 AU60631/94A AU6063194A AU671193B2 AU 671193 B2 AU671193 B2 AU 671193B2 AU 60631/94 A AU60631/94 A AU 60631/94A AU 6063194 A AU6063194 A AU 6063194A AU 671193 B2 AU671193 B2 AU 671193B2
- Authority
- AU
- Australia
- Prior art keywords
- sheet metal
- joints
- web
- structural members
- thin sheet
- 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.)
- Ceased
Links
Landscapes
- Joining Of Building Structures In Genera (AREA)
- Connection Of Plates (AREA)
Description
1 P/00/01 1 Regulation 3.2
AUSTRALIA
Patents Act 1990
ORIGINAL
COMPLETE SPECIFICATION STANDARD PATENT Invention Title: "JOINTS BETWEEN THIN SHEET METAL STRUCTURAL MEMBERS" Tho following statement is a full description of this invention, including the best method of performing it known to the Applicant:- This invention relates to structural frames, particularly but not exclusively roof trusses for buildings, of the kind wherein the individual structural members of the frame are cold-formed from thin sheet metal, by which is meant metal not exceeding 1.2 mm. in thickness., i Such members conventionally comprise a substantially flat web and flanges extending along opposite edges of the web. For example, the member may be a channel or of C or Z section. Members of this kind, fabricated from metal having a Thickness within the range of 0.4 to 0.8 mm., find widespread use as the structural members of wall frames and roof trusses in dwellings, sheds, small comrrmercial buildings and the like.
2 The building industry in respect of domestic housing and like buildings is very competitive and every effort is made to contain costs, not only in the design of the structural members used but also in the erection of prefabricated or other frames made from them. Thus, it is desirable for the members to be made of metal of the lightest practicable gauge, and for them to be fully formed at the factory so as to reduce or eliminate as much on-site assembly work as possible.
SOne consequence of using very light gauge metal is the difficulty 4 of ensuring that imposed loads are transferred to the section as a whole.
10 Generally speaking, the design of structural members becomes more o exacting and critical as the thickness of the metal decreases. The lighter the gauge of the sheet metal the more likely is a catastrophic, progressive type failure originating in the unintended or excessive deflection of a small part of the section, due to uneven imposition of a 15 load.
In triangulated structureE, wherein the rigidity of the structure as a whole depends on the geometric arrangement of the members rather than the stiffness of the joints between members, it is desirable to use pin joints that comprise a single cylindrical fastener, such as a bolt or rivet, extending through overlapping parts of the webs of members to be joined. Unfortunately this results in concentrated loads being applied to the web and poor transfer of the load to the flanges. Therefore it is customary to provide large, relatively thick, usually rectangular,
VF
reinforcing washers under the head of the bolt and the nut (or the equivalent parts of other pin fasteners) so as to spread the applied load over a substantial area of the web.
2L 3 This increases the cost of the joint by the cost of the washers, increases the on-site assembly time and carries with it the risk of a faulty joint due to the inadvertent omission of a washer.
Therefore it is an object of the invention to eliminate the need for a reinforcing washer or washers at a frame joint of the kind discussed above.
The invention achieves that object by providing stress distributing I and stiffening ribs in the web of a light gauge sheet metal structural o. member closely adjacent to, and on each side of, a fastener clearance 10 hole for a pin joint piercing the web of the member, for use in conjunction with a pin fastener having a head sized so as to bear upon i those ribs.
Therefore, the invention consists in an assembly of a structural member, cold-formed from sheet metal no more than 1.2 mm. thick, and i 15 comprising a substantially planar web and at least one flange extending along said web, a fastener clearance hole piercing said web and two ribs in said web disposed one on either side of said hole and closely adjacent thereto, with a headed pin fastener extending through said hole, wherein the head of the fastener bears upon the ribs.
By way of example, an embodiment of the above described invention is described in more detail hereinafter with reference to the accompanying drawings.
Figure 1 is an end elevation of an assembly according to the i invention, with one end part of a pin fastener omitted. t S. k I P1_
A
i i i 1 r a 4* Rue.
a a 4 Figure 2 is a side elevation of an end part of the assembly of figure 1.
Figure 3 is a sectional view of the assembly of figure 1 taken on line 3-3 of figure 2.
The illustrated member is a C-sectioned bar, comprising a web 4 and lipped flanges 5, that has been cold-rolled from steel sheet having a thickness within the range of 0.4 to 0.8 mm., preferably substantially 0.0 mm.. The steel sheet is preferably coated with zinc or an alloy of aluminium and zinc. It is made from structural grade steel having a 10 tensile strength in excess of 500 MPa but only moderate ductility. Thus it is stiff but subject to sudden failure if overstressed.
The member may be used as an internal member of a roof truss extending, for example from a top chord to the bottom chord of the truss. In that event the ends of the web 4 may lie flatly against the webs of the respective chords and the member may be joined to the chords by pin joints, each comprising a single pin fastener, for example a through bolt 8, piercing the overlapping webs of the corresponding chord and the member.
preformed with a clearance hole 6 adapted to be aligned with corresponding holes in the webs of the truss chords.
The clearance hole 6 is flanked by closely adjacent stress distributing and. stiffening ribs 7 formed in the web 4. The ribs 7 extend substantially from one edge of the web 4 to the other.
I
In use, the through bolt 8 or other pin fastener may be inserted through the aligned clearance holes in the chord and member webs, and tightened up to complete the joint therebetween.
A fastener is selected that has a large enough head (or, in the case of a bolt, a correspondingly sized nut) to overlie the ribs 7, so that the head of the bolt (or the nut) bears firmly against the crests of the ribs 7. It has been found that this distributes the loads at the joint towards the flanges sufficiently for the stiffness of the member as a i whole to contribute to the stability of the connection, and to enable the 10 prior used reinforcing washers to be dispensed with.
o *0t* 0 For preference, the bolt head is in the form of a hat, comprising a hexagonal crown 9 adapted to receive a spanner and a circular brim I underlying the crown and adapted to bear against the ribs 7. The nut of the bolt is similarly shaped.
Claims (3)
- 3. An assembly according to claim 2 wherein said web disposteel has a on ethicness within the range of from 0.4 mm to 0.8 mm.headed
- 4. An assembly according to ciaim 3 wherein said thickness is substantially 0.6 mm.
- 5. An assembly according to any one of the preceding claims 1 wherein said pin fastener is a bolt having a head in the form of a hat Ai ,A having a hexagonal crown adapted to receive a spanner and a circular brim underlying the crown and bearing against the ribs. Applicant B.H.P. STEEL (JLA) PTY. LTD. Date 20 April 1994
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU60631/94A AU671193B2 (en) | 1993-04-28 | 1994-04-21 | Joints between thin sheet metal structural members |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPL853593 | 1993-04-28 | ||
AUPL8535 | 1993-04-28 | ||
AU60631/94A AU671193B2 (en) | 1993-04-28 | 1994-04-21 | Joints between thin sheet metal structural members |
Publications (2)
Publication Number | Publication Date |
---|---|
AU6063194A AU6063194A (en) | 1994-11-03 |
AU671193B2 true AU671193B2 (en) | 1996-08-15 |
Family
ID=25632821
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AU60631/94A Ceased AU671193B2 (en) | 1993-04-28 | 1994-04-21 | Joints between thin sheet metal structural members |
Country Status (1)
Country | Link |
---|---|
AU (1) | AU671193B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003003574A (en) | 2001-06-20 | 2003-01-08 | Nippon Steel Corp | Method for assembling building by thin plate lightweight section steel |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4441579A (en) * | 1978-02-20 | 1979-08-30 | Brian George Smith | Member for purlins and girts |
-
1994
- 1994-04-21 AU AU60631/94A patent/AU671193B2/en not_active Ceased
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU4441579A (en) * | 1978-02-20 | 1979-08-30 | Brian George Smith | Member for purlins and girts |
Also Published As
Publication number | Publication date |
---|---|
AU6063194A (en) | 1994-11-03 |
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