The recommendations for waling plate depth and fixing methods have been determined based on the following criteria:
- Maximum dutch hip girder station 3600mm.
- Maximum roof pitch 35 degrees.
- Maximum truss centres 1200mm.
- Jack truss overhang plus cantilever not exceeding jack truss back span.
- Girder and waling plate to be designed using Multinail Software with a web layout similar to that selected from the following table.
- Minimum waling plate thickness to be 35mm.
Truss web layout | Maximum truss span (mm) |
---|---|
Queenpost | 5000 |
A Type | 8500 |
B Type | 12000 |
C Type | 16000 |
NOTES
- The fixing method of the waling plate to the dutch hip girder will generally determine the waling plate depth. Refer to Tables 1, 2, 3 or 4 to select the waling plate depth and fixing details.
- The truss chords MUST be a minimum of 90mm deep and webs a minimum of 70mm deep UNLESS noted otherwise in the following fixing recommendations.
- Joint groups as shown are for BOTH waling plate and truss members.
- Engineering fixings may be individually designed for other specific cases.
- Truss webbing types and span limits above relate to the fixing of waling plates only and does not refer to the maximum load carrying capacity of the truss itself.
Figure C2-03-01-13
Legend
- MNGT Multinail Green Tip Screw
- MNBT Multinail Black Tip Screw
- M10 10Ø Bolt
- M12 12Ø Bolt
- M16 16Ø Bolt
TABLE 1: Wind speed N1, N2 ,N3
DHG station (mm) | Steel sheet roof | Concrete tile roof | ||
---|---|---|---|---|
Waling plate depth | Fixing to chords and webs | Waling plate depth | Fixing to chords and webs | |
1800 | 90 | 3 Nails 1/MNGT 1/MNBT 1/M10 |
90 | 3 Nails 1/MNGT 1/MNBT 1/M10 |
2400 | 120 90 90 |
4 Nails 1/MNGT 1/MNBT 1/M10 |
120 120 120 90 |
4 Nails 2/MNGT 2/MNBT 1/M12 |
3000 | 120 120 90 90 |
4 Nails 2/MNGT 1/MNBT 1/M10 |
140 120 140 140 |
3/MNGT 2/MNBT 2/M12 1/M16 |
3600 | 120 120 90 |
2/MNGT 2/MNBT 1/M12 |
140 | 3/MNBT 2/MN12 |
TABLE 2: Wind speed N4, C1
DHG station (mm) | Steel sheet roof | Concrete tile roof | ||
---|---|---|---|---|
Waling plate depth | Fixing to chords and webs | Waling plate depth | Fixing to chords and webs | |
1800 | 90 | 1/MNGT 1/MNBT 1/M10 |
90 | 3 Nails 1/MNGT 1/MNBT 1/M10 |
2400 | 120 120 90 |
2/MNGT 2/MNBT 1/M12 |
120 120 90 |
2/MNGT 2/MNBT 1/M12 |
3000 | 120 120 90 |
2/MNGT 2/MNBT 1/M12 |
140 120 140 140 |
3/MNGT 2/MNBT 2/M12 1/M16 |
3600 | 140 | 3/MNGT 3/MNBT 2/M12 |
140 | 3/MNBT 2/MN12 |
TABLE 3: Wind speed C2
DHG station (mm) | Steel sheet roof | Concrete tile roof | ||
---|---|---|---|---|
Waling plate depth | Fixing to chords and webs | Waling plate depth | Fixing to chords and webs | |
1800 | 120 90 90 |
2/MNGT 1/MNBT 1/M10 |
90 | 1/MNGT 1/MNBT 1/M10 |
2400 | 120 120 140 |
2/MNGT 2/MNBT 2/M12 |
120 120 90 |
2/MNGT 2/MNBT 1/M12 |
3000 | 140 | 3/MNGT 3/MNBT 2/M12 |
140 120 140 140 |
3/MNGT 2/MNBT 2/M12 1/M16 |
3600 | 140 | 2/M12 | 140 | 3/MNBT 2/M12 |
TABLE 4: Wind speed C3
DHG station (mm) | Steel sheet roof | Concrete tile roof | ||
---|---|---|---|---|
Waling plate depth | Fixing to chords and webs | Waling plate depth | Fixing to chords and webs | |
1800 | 120 120 90 |
2/MNGT 2/MNBT 1/M12 |
90 | 1/MNGT 1/MNBT 1/M10 |
2400 | 140 | 3/MNGT 3/MNBT 2/M12 |
140 | 3/MNGT 3/MNBT 2/M12 |
3000 | 190 | 3/M12 | 140 | 2/M12 |
3600 | 190 | 2/M12 | 140 | 3/MNBT 2/M12 |
Waling plate fixed with 3/75mm x 3.05 Ø nails per member.
Figure C2-03-01-12
Waling plate fixed with 3/75mm x 3.05 Ø nails per member.
Figure C2-03-01-02
Waling plate fixed with 4/75mm x 3.05 Ø nails per member.
Figure C2-03-01-04
Waling plate fixed with 6/75mm x 3.05 Ø nails per member.
Figure C2-03-01-03
Multinail Green Tip Screws D=5.6mm | Multinail Black Tip Screws D=6.3 mm | |
---|---|---|
End distance 10D | 56mm | 63mm |
Edge distance 5D | 28mm | 32mm |
Spacing along grain 10D | 56mm | 63mm |
Spacing across grain 3D | 17mm | 19mm |
2/MNGT or 2/MNBT with 90mm web and 90mm Waling plate
Figure C2-03-01-07
2/MNGT or 2/MNBT with 70mm web and 120mm Waling plate
Figure C2-03-01-08
3/MNGT or 3/MNBT with 70mm web and 140mm Waling plate
Figure C2-03-01-09
2/MNGT or 2/MNBT 120mm Waling plate
Figure C2-03-01-10
3/MNGT or 3/MNBT 140mm Waling plate
Figure C2-03-01-11
Waling plate fixed with one bolt per member.
Figure C2-03-01-05
Waling plate fixed with two bolt per member.
Figure C2-03-01-06
Washers required for bolts as per AS1720.1 | |||
---|---|---|---|
Bolt dia. | Thickness | Circular washer | Square washer |
M10 | 2.5mm | 45mm | 40mm |
M12 | 3.0mm | 55mm | 50mm |
M16 | 4.0mm | 65mm | 57mm |