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The Impact of Load Rating Methods on Federal Bridge Program Funding
FHWA May 2005 (revised February 2006)
Table Versions of Images
Image 1: Percent Change in Deck area as a result of percent change in Item 66 (SR ≤ 80)
Factored All Highway - SR < 50 + 0.68(SR ≤ 80 & SR ≥ 50)
| NBI Item 66 varies from - 20% to +20% | Percent Change in Deck Area |
|---|
| -20 | 11.34910159 |
| -15 | 8.059694925 |
| -10 | 4.966131374 |
| -5 | 1.935235654 |
| 5 | -1.240089404 |
| 10 | -2.361242826 |
| 15 | -3.244527946 |
| 20 | -4.294749985 |
Image 2: Percent Change in Deck Area as a Result of Percent Change in Item 66 (SR ≤ 80)
| NBI Item 66 varies from - 20% to +20% | Percent Change in Deck Area |
|---|
| | All Highways | Federal-Aid System | Off System |
|---|
| -20 | 8.475086361 | 8.711077 | 7.505878252 |
| -15 | 6.099091384 | 6.2323 | 5.550088295 |
| -10 | 3.787982232 | 3.758034 | 3.908309186 |
| -5 | 1.440533987 | 1.304319 | 2.002630669 |
| 5 | -0.739572721 | -0.74751 | -0.707871356 |
| 10 | -1.433064803 | -1.21153 | -2.346298055 |
| 15 | -1.961039964 | -1.74469 | -2.853652783 |
| 20 | -2.685987749 | -2.20534 | -4.668199802 |
Image 3: Percent Change in Deck Area as a Result of Percent Change in Item 66 (SR < 50)
| NBI Item 66 varies from - 20% to +20% | Percent Change in Deck Area |
|---|
| | All Highways | Federal-Aid System | Off System |
|---|
| -20 | 29.37162798 | 32.73092 | 20.24546467 |
| -15 | 20.35435109 | 22.4598 | 14.61376675 |
| -10 | 12.3541312 | 13.44798 | 9.342688911 |
| -5 | 5.037436982 | 5.12315 | 4.803071968 |
| 5 | -4.378755832 | -4.79088 | -3.267985726 |
| 10 | -8.181710558 | -8.62654 | -6.985182564 |
| 15 | -11.29309213 | -11.8812 | -9.70447646 |
| 20 | -14.38306112 | -14.693 | -13.54848668 |
Image 4: Percent Change in Deck Area as a Result of Percent Change in NBI Item 66 (SR ≥ 50 and SR ≤ 80)
| NBI Item 66 varies from - 20% to +20% | Percent Change in Deck Area |
|---|
| | All Highways | Federal-Aid System | Off System |
|---|
| -20 | -2.235653577 | -1.95075 | -3.725375602 |
| -15 | -1.207590373 | -0.97069 | -2.440475149 |
| -10 | -0.602686594 | -0.5431 | -0.882654682 |
| -5 | -0.403096086 | -0.39077 | -0.466245956 |
| 5 | 1.125728465 | 1.047247 | 1.549132399 |
| 10 | 2.02602383 | 2.079809 | 1.743355078 |
| 15 | 2.822200519 | 2.754667 | 3.186051904 |
| 20 | 3.309468972 | 3.337609 | 3.160685131 |
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