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Scope Of Design 

There are design limitations with this manual, and they are listed below.  Any plan or design, which is outside these design limitations, should have appropriate design and component criteria evaluated by Palmer Steel Frame & Truss.  It is advised that regional wind ratings be checked with your local council if there is any doubt.

             Truss Span                                        less than or equal to 15m

 Stud Type                                         stiffened flange “dovetail” wall studs

                                                          (dimensions 90x38x0.75) 

Roof Type                                          Tiled or Sheet Roof 

Wall Height                                        2400mm; 2700mm; 3000mm 

Wind Ratings                                      W28; W33; W41N 

Connection Systems                            4.8 x 11 Steel shank Steel stem Rivets 

DESIGN & TESTING DETAILS 

Stud capacities have been determined from engineering testing 

Studs are designed to carry full wind load and gravity loads on external walls 

The maximum unsupported roof overhang is assumed to be 1000mm and raked, unless otherwise stated 

2400mm and 2700mm load-bearing wall heights are to have one row of nogging at mid height 

3000mm load-bearing heights are to have two rows of nogging at 1200mm minimum spacing 

The number of clinches or screws required for each joint will be noted appropriately 

Note:  Where clinch joints are used, Palmer Steel Frame & Truss Steel Frames & Trusses will ensure that the appearance and width of the clinches are in accordance with all relevant Codes and Standards

 Section Details:

                                   

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Section Details:

Component

Thickness

(mm)

Coating Mass

(g/m2)

Mass

(kg/m)

Yield Strength

(Mpa)

90mm Open Stud

0.6

150

1.17

550

90mm Open Stud

0.75

150

0.95

550

Top & Bottom Plate

0.75

150

1.27

550

Strip Nogging

0.48

150

0.29

550

               

 

Roof Truss System:

Scope of design:

The pitch range for Sheet Roof trusses is 150 – 300.  The pitch range for Tile Roof trusses is 160 – 300. Truss Spacing for tiled roofs shall be max 600mm. Truss spacing for sheet roofs shall be max of 1200mm. 

In every case the top and bottom chords are constructed from boxed 90mmx38mmx.75mm cold-formed section riveted together at maximum 600 centres on both of the 38mm sides. Rivets shall be 4.8 dia x 11mm Steel rivet. 

For all web, knee joint and apex bolts, 12mm flange bolts will be used. 

For each type of truss the cutting length of the bottom chord is equal to the specified span, including the thickness of the supporting walls.  Cutting length for the top chord is the tabulated rafter length plus an allowance for eave overhang.  Tabulated lengths of web members are calculated on the bases of a knee height of 105mm.  Minor adjustments may be required to the cutting lengths of web members if this knee height is varied.

 

                  

 

 

 

 

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Copyright © 2001 L & M Palmer Steel Frames & Trusses
Last modified: September 08, 2003