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Z.1 COMMERCIAL GRADE STEEL.
THICKNESS 0.5mm Safe
Working Load kN/m2
|
Span
in |
Single Span Deflection Ratio |
Multi Span Deflection Ratio |
|
Metres |
Across 2 Bearers |
Across 3 Bearers |
| |
L/100 |
L/150 |
L/200 |
L/100 |
L/150 |
L/200 |
|
1.000 |
3.03 |
3.03 |
3.03 |
2.92 |
2.92 |
2.92 |
|
1.250 |
1.94 |
1.94 |
1.94 |
2.05 |
2.05 |
2.05 |
|
1.500 |
1.35 |
1.35 |
1.23 |
1.52 |
1.52 |
1.52 |
|
1.750 |
0.99 |
0.99 |
0.79 |
1.17 |
1.17 |
1.17 |
|
2.000 |
0.76 |
0.69 |
0.54 |
0.93 |
0.93 |
0.93 |
|
2.250 |
0.60 |
0.49 |
0.38 |
0.76 |
0.76 |
0.71 |
|
2.550 |
0.49 |
0.36 |
0.28 |
0.63 |
0.63 |
0.53 |
|
2.750 |
0.39 |
0.28 |
0.21 |
0.53 |
0.51 |
0.40 |
|
3.000 |
0.31 |
0.22 |
0.17 |
0.45 |
0.40 |
0.31 |
Z.1 COMMERCIAL GRADE STEEL.
THICKNESS 0.55mm
|
Span
in |
Single Span Deflection Ratio |
Multi Span Deflection Ratio |
|
Metres |
Across 2 Bearers |
Across 3 Bearers |
| |
L/100 |
L/150 |
L/200 |
L/100 |
L/150 |
L/200 |
|
1.000 |
3.53 |
3.53 |
3.53 |
3.40 |
3.40 |
3.40 |
|
1.250 |
2.26 |
2.26 |
2.26 |
2.38 |
2.38 |
2.38 |
|
1.500 |
1.57 |
1.57 |
1.40 |
1.76 |
1.76 |
1.76+ |
|
1.750 |
1.15 |
1.15 |
0.90 |
1.35 |
1.35 |
1.35 |
|
2.000 |
0.88 |
0.79 |
0.62 |
1.08 |
1.08 |
1.08 |
|
2.250 |
0.70 |
0.56 |
0.44 |
0.88 |
0.88 |
0.81 |
|
2.550 |
0.56 |
0.42 |
0.33 |
0.73 |
0.73 |
0.59 |
|
2.750 |
0.45 |
0.32 |
0.24 |
0.61 |
0.58 |
0.45 |
|
3.000 |
0.35 |
0.25 |
0.19 |
0.52 |
0.46 |
0.36 |
Z.1 COMMERCIAL GRADE STEEL.
THICKNESS 0.60
|
Span
in |
Single Span Deflection Ratio |
Multi Span Deflection Ratio |
|
Metres |
Across 2 Bearers |
Across 3 Bearers |
| |
L/100 |
L/150 |
L/200 |
L/100 |
L/150 |
L/200 |
|
1.000 |
4.04 |
4.04 |
4.04 |
3.89 |
3.89 |
3.89 |
|
1.250 |
2.58 |
2.58 |
2.58 |
2.72 |
2.72 |
2.72 |
|
1.500 |
1.79 |
1.79 |
1.58 |
2.01 |
2.01 |
2.01 |
|
1.750 |
1.32 |
1.30 |
1.01 |
1.54 |
1.54 |
1.54 |
|
2.000 |
1.01 |
0.89 |
0.69 |
1.23 |
1.23 |
1.23 |
|
2.250 |
0.80 |
0.64 |
0.49 |
1.00 |
1.00 |
0.91 |
|
2.550 |
0.65 |
0.47 |
0.37 |
0.83 |
0.83 |
0.67 |
|
2.750 |
0.51 |
0.35 |
0.27 |
0.70 |
0.66 |
0.51 |
|
3.000 |
0.40 |
0.28 |
0.22 |
0.59 |
0.51 |
0.40 |
Z.1 COMMERCIAL GRADE STEEL.
THICKNESS 0.70mm
|
Span
in |
Single Span Deflection Ratio |
Multi Span Deflection Ratio |
|
Metres |
Across 2 Bearers |
Across 3 Bearers |
| |
L/100 |
L/150 |
L/200 |
L/100 |
L/150 |
L/200 |
|
1.000 |
5.11 |
5.11 |
5.11 |
4.93 |
4.93 |
4.93 |
|
1.250 |
3.27 |
3.27 |
3.27 |
3.43 |
3.43 |
3.43 |
|
1.500 |
2.27 |
2.27 |
1.95 |
2.53 |
2.53 |
2.53 |
|
1.750 |
1.67 |
1.61 |
1.25 |
1.94 |
1.94 |
1.94 |
|
2.000 |
1.28 |
1.10 |
0.85 |
1.54 |
1.54 |
1.54 |
|
2.250 |
1.01 |
0.78 |
0.61 |
1.25 |
1.25 |
1.13 |
|
2.550 |
0.82 |
0.58 |
0.44 |
1.04 |
1.04 |
0.83 |
|
2.750 |
0.63 |
0.44 |
0.34 |
0.87 |
0.81 |
0.63 |
|
3.000 |
0.49 |
0.34 |
0.27 |
0.73 |
0.63 |
0.48 |
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FORMULA EMPLOYED
SINGLE SPAN
M max = WL over 8 Deflection = 5WL3 over 384 El
DOUBLE SPAN
M max = WL over 8 Deflection = 5WL3 over 384 El
The table gives permissible spans in metres
for stress limit, or specified deflection limit.
Wind loads should be calculated in
accordance with CP3 Chapter V, Prt2: 1977.
When wind loading governs the design a 25%
increase in permissible stress is allowed. The wind load can
be multiplied by a factor of 0.8 before entering the tables.
Snow load is 0.75 kN/m2 for sloping roofs up
to and including 10 deg. (BS6399 : Part 1: 1984).
RED DENOTES STRESS LIMITED. BLACK DENOTES
DEFLECTION LIMITED.
The load span tables have been calculated in
accordance with European Recommendations for the design of
profiled sheeting. ECCS-TC7-1983 which uses an effective
width approach for flanges in compression and are based on a
minimum bearing surface of 50mm.
Additional reference: British Standards
Codes of Practice and Loading Criteria for Profiled Sheeting
in Building (BS5427:1976).
In accordance with the manufacturers policy
of continuous improvement, the manufacturers reserve the right
to alter specifications without prior notice. The information
contained herein is for guidance only. All dimensions and
weights are nominal and may be subject to change.
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