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Load Spans

AG40 Multi Span Condition
Bar
Spacing
(m)
Direction
of
Loading
Bracket Centres Along Bar (m)
0.5
0.6
0.7
0.8
0.9
1.0
Loading in kN/m²
0.5
Download
Uplift
12.00
12.00
10.00
10.00
8.57
8.57
6.97
7.50
5.51
6.3
4.46
5.10
0.6
Download
Uplift
10.00
10.00
8.33
8.33
7.14
7.14
5.81
6.25
4.59
5.25
3.75
4.25
0.7
Download
Uplift
8.57
8.57
7.14
7.14
6.12
6.12
4.98
5.36
3.94
4.50
3.19
3.64
0.8
Download
Uplift
7.5
7.5
6.25
6.25
5.36
5.36
4.36
4.69
3.44
3.94
2.79
3.19
0.9
Download
Uplift
6.67
6.67
5.56
5.56
4.76
4.76
3.87
4.17
3.06
3.50
2.48
2.83
1.0
Download
Uplift
6.00
6.00
5.00
5.00
4.29
4.29
3.49
3.75
2.75
3.15
2.23
2.55
1.2
Download
Uplift
5.00
5.00
4.17
4.17
3.57
3.57
2.91
3.13
2.30
2.62
1.86
2.13
1.4
Download
Uplift
4.29
4.29
3.57
3.57
3.06
3.06
2.49
2.68
1.97
2.25
1.59
1.82
1.6
Download
Uplift
3.75
3.75
3.13
3.13
2.68
2.68
2.18
2.34
1.72
1.97
1.39
1.59
1.8
Download
Uplift
3.33
3.33
2.78
2.78
2.38
2.38
1.94
2.08
1.53
1.75
1.24
1.42
2.0
Download
Uplift
3.00
3.00
2.50
2.50
2.14
2.14
1.74
1.88
1.38
1.57
1.12
1.28

Notes:
All loads are working loads.
Steel based on Z35 material.
Download deflection = span/200.
Figures limited to a bar/bracket connection load of
3kN.
Pull-out of screws into purlin assumed to be 3kN.
Ultimate bending stress is based on a load factor
of 1.6 for download and 1.4 for uplift.
 

TH40 Multi Span Condition
Top-hat
Spacing
(m)
Rail Centres Vertically (m)
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
Loading in kN/m²
0.6
5.00
4.17
3.57
3.13
2.78
2.47
1.86
1.43
0.8
3.75
3.13
2.68
2.34
2.08
1.85
1.39
1.07
1.0
3.00
2.50
2.14
1.88
1.67
1.48
1.11
0.86
1.2
2.50
2.08
1.79
1.56
1.39
1.24
0.93
0.72
1.4
2.14
1.79
1.53
1.34
1.19
1.06
0.80
0.61
1.6
1.88
1.56
1.34
1.17
1.04
0.93
0.70
0.54
1.8
1.67
1.39
1.19
1.04
0.93
0.82
0.62
0.48
2.0
1.50
1.25
1.07
0.94
0.83
0.74
0.56
0.43
2.2
1.36
1.14
0.97
0.85
0.76
0.67
0.51
0.39
2.4
1.25
1.04
0.89
0.78
0.69
0.62
0.46
0.36
2.6
1.15
0.96
0.82
0.72
0.64
0.57
0.43
0.33
2.8
1.07
0.89
0.77
0.67
0.60
0.53
0.40
0.31
3.0
1.00
0.83
0.71
0.63
0.56
0.49
0.37
0.29

TH60 Multi Span Condition

Top-hat
Spacing
(m)
Rail Centres Vertically (m)
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
Loading in kN/m²
0.6
5.00
4.17
3.57
3.13
2.78
 2.50 2.27 20.8
0.8
3.75
3.13
2.68
2.34
2.08
 1.88 1.70 1.56
1.0
3.00
2.50
2.14
1.88
1.67
 1.50 1.36 1.25
1.2
2.50
2.08
1.79
1.56
1.39
 1.25 1.14 1.04
1.4
2.14
1.79
1.53
1.34
1.19
 1.07 0.97 0.89
1.6
1.88
1.56
1.34
1.17
1.04
 0.94 0.85 0.78
1.8
1.67
1.39
1.19
1.04
0.93
 0.83 0.76 0.69
2.0
1.50
1.25
1.07
0.94
0.83
 0.75 0.68 0.63
2.2
1.36
1.14
0.97
0.85
0.76
 0.68 0.62 0.57
2.4
1.25
1.04
0.89
0.78
0.69
 0.63 0.57 0.52
2.6
1.15
0.96
0.82
0.72
0.64
 0.58 0.52 0.48
2.8
1.07
0.89
0.77
0.67
0.60
 0.54 0.49 0.45
3.0
1.00
0.83
0.71
0.63
0.56
 0.50 0.45 0.42

Notes:
All loads are working loads
(pressure and suction).
Steel based on Z35 material.
Figures limited by pull-out load of 3kN at
bracket position using 2 screws.
Ultimate bending stress is based on a load
factor of 1.4
 
   
     
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