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Brown-Campbell 1-800-GRATING or 1-800-472-8464 | |||||
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R Series •Bearing
Bars: 2-1/2" to 2-11/16" |
RF Series (with filler
bars) •Bearing
Bars: 5-1/8" to 5-1/4" |
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| Basis For Design | ||
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Loadings per AASHTO |
H15/HS15 | H20/HS20 |
| Total Weight for H or weight on first two axles for HS (lbs) | 30,000 | 30,000 |
| Rear Axle Load
(lbs) (80% of total load) |
24,000 | 24,000 |
| Rear Axle Load
(lbs) (50% of total load) |
12,000 | 12,000 |
| Impact Factor (maximum) | 30% | 30% |
| Rear Wheel Load with Impact (lbs) | 15,600 | 15,600 |
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Load Distribution per AASHTO |
H15/HS15 | H20/HS20 |
| Normal to Bearing Bars (1-1/4" per ton of axle load plus twice the bearing bar spacings) (inches) | 15" + 2A | 20" + 2A |
| Parallel to Bearing Bars (inches) | 15" | 20" |
| Fiber Stress (psi) = 20,000 | ||
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Notes: •Heavy Duty Riveted Grating designed in accordance with AASHTO Standard Specifications for Highway Bridges. •A=Inside Face to Inside Face of Bearing Bars •It is recommended that bearing bars be placed parallel to traffic. If the engineer specifies placement perpendicular to traffic, measures should be taken to minimize the effects of out-of-place bending of bars due to vehicle acceleration and braking. •The engineer must specify hold down anchors at ends and supports as necessary. |
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©2007 Copyright Brown-Campbell Company. All Rights Reserved. |
