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j.gu@powergrate.com
Allowable Spans for Vehicular Loads
| Wheel Load (kg) - 1/2 Axle Load +30% Impact |
Load Distribution | Allowable Span2,3 | |||
| Parallel To Axle (mm)1 |
Perpendicular To Axle (mm) |
38mm Deep HLC Molded Grating |
51mm Deep HLC Molded Grating | ||
| AASHTO Standard Truck4 / 14,515 kg Axle Load Dual Wheels(*formerly AASHTO H-20) |
9,434 |
508 + 102 | 203 | 356mm | 432mm |
| Automobile Traffic / 2,268 kg Vehicle 680 kg Load / 55% Drive Axle Load |
998 | 203 + 102 | 203 | 660mm | 813mm |
| 4,536 kg Capacity Forklift / 6,532 kg Vehicle 11,068 kg Total Load / 85% Drive Axle Load |
6,114 | 279 + 102 | 279 | 330mm | 432mm |
| 2,722 kg Capacity Forklift / 4,445 kg Vehicle 7,167 kg Total Load / 85% Drive Axle Load |
3,960 |
178 + 102 | 178 | 304mm | 406mm |
| 907 kg Capacity Forklift / 1,905 kg Vehicle 2,812 kg Total Load / 85% Drive Axle Load |
1,554 |
102 + 102 |
102 | 483mm | 635mm |
Notes:
1. Load is carried by the grating load bars immediate under wheel + four additional load bars adjacent to wheel.
2. Allowable Span is based on a 6.4mm maximum deflection and a Factor of Safety of 2.5. Other criteria may be required by certain construction codes. Check code requirements to determine design criteria.
3. ALLOWABLE SPAN IS STRONGLY DEPENDENT ON WHEEL WIDTH AND VEHICLE WEIGHT/LOAD CAPACITY. If your application varies from the values given on this table, contact Fibergrate Engineering for application assistance.
4. Load based on the AASHTO Standard Truck Load as defined in AASHTO LRFD Bridge Design Specifications, 2nd Ed. This does not imply that the allowable span meets the deflection requirements of this specification.
Uniform Line Load Table - Deflection in Millimeters
| Span (mm) |
Style | UNIFORM LOAD(KN/M2) | MAXIMUM RECOMMENDED LOAD (KN/M2) |
ULTIMATE CAPACITY (KN/M2) | ||||||||||
| Depth (mm) |
Mesh (mm) |
5 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | |||
| 400 | 38 | 25x51 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | 0.3 | 0.3 | 0.3 | 0.5 | 751 | 1876 |
| 51 | 25x51 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | <0.3 | 832 | 2075 | |
| 600 | 38 | 25x51 | <0.3 | <0.3 | 0.5 | 0.7 | 1.0 | 1.3 | 1.6 | 1.9 | 2.2 | 2.5 | 337 | 843 |
| 51 | 25x51 | <0.3 | <0.3 | 0.3 | 0.5 | 0.6 | 0.8 | 0.9 | 1.0 | 1.2 | 1.3 | 444 | 1109 | |
| 800 | 38 | 25x51 | 0.9 | 1.2 | 1.7 | 2.5 | 3.4 | 4.2 | 5.0 | 5.9 | 6.7 | 7.4 | 189 | 469 |
| 51 | 25x51 | 0.4 | 0.6 | 0.9 | 1.4 | 1.8 | 2.3 | 2.8 | 3.2 | 3.7 | 4.1 | 251 | 629 | |
| 1000 | 38 | 25x51 | 1.9 | 2.7 | 3.9 | 5.9 | 7.8 | 9.5 | 11.5 | - | - | - | 100 | 256 |
| 51 | 25x51 | 1.2 | 1.6 | 2.3 | 3.4 | 4.6 | 5.7 | 6.8 | 8.0 | 9.1 | 10.3 | 160 | 398 | |
Concentrated Line Load Table - Deflection in Millimeters
| Span (mm) |
Style | CONCENTRATED LINE LOAD(KN/M OF WIDTH) | MAXIMUM RECOMMENDED LOAD (KN/M OF WIDTH) |
ULTIMATE CAPACITY (KN/M OF WIDTH) | ||||||||||
| Depth (mm) |
Mesh (mm) |
1.5 | 2.0 | 10.0 | 20.0 | 30.0 | 40.0 | 50.0 | 60.0 | 70.0 | 85.0 | |||
| 400 | 38 | 25x51 | <0.3 | 0.5 | 0.5 | 1.2 | 1.8 | 1.8 | 2.2 | 2.6 | 3.0 | 4.1 | 157 | 471 |
| 51 | 25x51 | <0.3 | <0.3 | 0.3 | 0.6 | 0.8 | 1.1 | 1.3 | 1.6 | 1.8 | 2.2 | 178 | 536 | |
| 600 | 38 | 25x51 | <0.3 | 0.8 | 1.5 | 2.9 | 4.3 | 5.7 | 7.1 | 8.5 | 10.0 | - | 101 | 303 |
| 51 | 25x51 | <0.3 | 0.4 | 0.7 | 1.5 | 2.3 | 3.1 | 3.9 | 4.7 | 5.5 | 6.7 | 130 | 393 | |
| 800 | 38 | 25x51 | 0.5 | 1.7 | 3.4 | 6.7 | 10.1 | - | - | - | - | - | 75 | 227 |
| 51 | 25x51 | 0.3 | 1.0 | 1.9 | 3.7 | 5.6 | 7.5 | 9.3 | 11.2 | - | - | 102 | 308 | |
| 1000 | 38 | 25x51 | 1.0 | 3.2 | 6.3 | 12.5 | - | - | - | - | - | - | 60 | 181 |
| 51 | 25x51 | 0.6 | 1.9 | 3.6 | 7.2 | 10.9 | - | - | - | - | - | 77 | 233 | |
NOTES:
1. ULTIMATE CAPACITY represents a complete and total failure of the grating. Values are provided to illustrate the reserve strength of the grating at a given span and are NOT to be used for design.
Functionality of grating is limited to MAX RECOMMENDED LOAD.
2. The allowable loads in this table are for STATIC LOAD CONDITIONS at ambient temperatures only. Allowable loads for impact conditions should be a maximum of ONE-HALF the values shown. Long term loads will result in added deflection due to creep in the material and will also require higher safety factors to ensure acceptable performance. For applications at elevated temperatures, consult factory. The designer is further referenced to ASCE Structural Plastics Design Manual.
3. Fibergrate recommends a maximum deflection of 6.4mm for this product under normal loading conditions. The use of L/500 may be required by certain construction codes. Check code requirements to determine design criteria.
4. All gratings were tested in accordance with the ANSI Standard: FRP Composites Grating Manual for Pultruded and Molded Grating and Stair Treads.
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