Load Deflection Tables


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Deflections:

The following is designed to help when calculating an acceptable deflection rate: For pedestrian traffic, the deflection of a floor panel under the design load shall not exceed 10mm or 1/200th of the span, whichever is the lesser. The difference in level between a loaded and a neighbouring unloaded flooring shall not exceed 4mm. 

Deflections rates taken from BS4592-0:2006.

GRP Grating Concentrated Load

Below load data is for a concentrated load, a point load of approx. 300x300mm square similar to pedestrian loadings.

Grating Type Different thicknesses and meshSpan The distance between supports Load in KGs applied to applied to grating panel 

149kg

372kg

 

745kg

1117kg

 

1490kg

2234kg

2979kg


 

 Above load applied gives below deflection on panels ↓

 25mm thick / 32mm hole457mm → 

 0.3mm

0.7mm1.6mm 2.2mm2.7mm4.2mm 5.2mm
 38mm thick / 32mm hole457mm → 0.2mm 0.4mm 0.7mm 0.9mm 1.1mm 1.7mm2.2mm
 50mm thick / 42mm hole457mm0.1mm 0.2mm0.35mm0.5mm 0.65mm 0.90mm1.1mm 
14mm thick / 13mm hole457mmN/A N/A N/A  N/AN/A N/A N/A 
 TypeSpan149kg372kg745kg1117kg1490kg2234kg2979kg
 25/32mm610mm → 0.7mm  1.7mm3.2mm4.6mm6.1mm9.1mm 12.1mm
38/32mm610mm → 0.35mm0.9mm1.5mm1.9mm2.4mm3.5mm4.2mm 
50/42mm610mm → 0.1mm0.35mm 0.7mm1.1mm1.5mm2.0mm2.5mm
14/13mm610mm →  N/AN/AN/AN/AN/AN/AN/A
 TypeSpan149kg372kg745kg1117kg1490kg2234kg2979kg
 25/32mm914mm →  1.8mm4.5mm8.8mm13mm17mm25mm32mm
38/32mm914mm → 0.6mm 1.5mm 2.9mm4.1mm5.4mm8mm10.6mm 
50/42mm914mm →  0.2mm0.7mm 1.4mm 1.9mm 2.9mm 4.2mm5.5mm
14/13mm 914mm →  N/AN/AN/AN/AN/AN/AN/A
 TypeSpan149kg372kg745kg1117kg1490kg2234kg2979kg
 25/32mm1219mm → 2.95mm7.55mm15mm21mm31mm39mm49mm
38/32mm1219mm → 0.9mm2.4mm4.7mm7mm9.2mm13.7mm17.5mm
50/42mm1219mm →  0.4mm1mm2.2mm3.2mm4.55mm6.8mm9.3mm
14/13mm 1219mm →  N/AN/AN/AN/AN/AN/AN/A
         

N/A = Not currently available


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