State Bridge Load Posting Processes and Practices (2014) / Chapter Skim
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5 This chapter presents information from the National Bridge Inventory (NBI) for reporting year 2012 (1)
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6 TABLE 1 NBI DATA ITEMS EXAMINED FOR CORRELATION WITH LOAD POSTING Item Title Note 1 State code Federal Information Processing Standards (FIPS) codes for states 5B Route signing prefix Interstate, U.S.
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7 TABLE 3 LOAD POSTING AND BRIDGE OWNER Item 22 Owner Structures Posted for Load % of Owner % of Load Posted Federal Government 8,890 515 5.8 0.84 State Government 293,870 10,045 3.4 16.5 Local Government 305,505 50,170 16.4 82.2 Other 1,449 306 21.1 0.50 TABLE 4 LOAD POSTING AND ROUTE SIGNING PREFIX Item 5B Route Signing Prefix Structures Posted for Load % by Route % of Load Posted Interstate Highway 55,981 147 0.26 0.24 U.S. Numbered Highway 54,218 510 0.94 0.84 State Highway 147,441 7,392 5.0 12.1 County Highway 259,656 44,884 17.3 73.5 City Street 68,222 6,003 8.8 9.8 Federal Lands Road 7,175 312 4.3 0.51 State Lands Road 1,135 195 17.2 0.32 Other 15,892 1,595 10.0 2.6 TABLE 5 LOAD POSTING AND BASE HIGHWAY NETWORK Item 12 Base Highway Network Structures Posted for Load % of System % of Load Posted Inventory Route Is Not on the Base Network 412,817 55,991 13.6 91.7 Inventory Route Is on the Base Network 150,527 2,967 2.0 4.9 TABLE 6 LOAD POSTING AND DESIGNATED NATIONAL NETWORK Item 110 Designated National Network Structures Posted % of System % of Load Posted Not Part of the National Network for Trucks 513,827 59,531 11.6 97.5 Part of the National Network for Trucks 95,896 1,506 1.6 2.5 TABLE 7 LOAD POSTING AND HIGHWAY SYSTEM Item 104 Highway System of the Inventory Route Structures Posted % of System % of Load Posted Inventory Route Is Not on the NHS 491,984 60,540 12.3 99.2 Inventory Route Is on the NHS 117,743 497 0.4 0.8 LOAD POSTING AND ROUTE SERVICE More than 90% of structures posted for load are on rural routes (Table 10)
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8 TABLE 11 LOAD POSTING AND LEVEL OF SERVICE Item 5C Designated Level of Service Structures Posted for Load % of Level of Service % of Load Posted None of the Below 60,629 5,164 8.5 8.5 Mainline 517,182 54,114 10.5 88.7 Alternate 7,250 872 12.0 1.4 Bypass 1,204 17 1.4 0.0 Spur 2,414 137 5.7 0.2 Business 2,548 180 7.1 0.3 Ramp, Wye, Connector, etc. 11,878 64 0.5 0.1 Service/Frontage Road 6,622 490 7.4 0.8 TABLE 8 LOAD POSTING AND STRAHNET Item 100 STRAHNET Highway Designation Structures Posted % of Group % of Load Posted Not a STRAHNET Route 541,477 60,854 11.2 99.7 Interstate STRAHNET Route 56,952 155 0.27 0.25 Non-Interstate STRAHNET Route 10,314 24 0.23 0.04 STRAHNET Connector Route 984 4 0.41 0.01 LOAD POSTING AND GENERAL CONDITION RATINGS General condition ratings (GCR)
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9 each, are shown in Table 22. The top ten counts of load posted bridges and culverts by structure type are shown in Table 23.
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10 SUMMARY ON STATUS OF LOAD POSTING NBI records were examined for the counts and distributions of load posted bridges and culverts. Ten percent of U.S.
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11 Item 43 Structure Type, Main Structures Posted % of Group % of Load Posted Steel Stringer/multi-beam or girder 101,454 22,481 22.2 36.8 Wood or Timber Stringer/multi-beam or girder 18,180 9,373 51.6 15.4 Steel Truss -- Thru 9,396 4,927 52.4 8.1 Concrete Slab 33,123 3,907 11.8 6.4 Steel Continuous Stringer/multi-beam or girder 47,005 2,710 5.8 4.4 Concrete Culvert (includes frame culvert) 89,624 2,038 2.3 3.3 Concrete Tee beam 20,295 1,997 9.8 3.3 Steel Girder and floor beam system 3,993 1,630 40.8 2.7 Concrete Channel beam 12,748 1,576 12.4 2.6 Concrete Continuous Slab 31,940 1,489 4.7 2.4 TABLE 23 MOST NUMEROUS POSTED STRUCTURES BY STRUCTURE TYPE Item 43 Structure Type, Main Structures Posted % of Group % of Load Posted Steel Stringer/multi-beam or girder 101,454 22,481 22.2 36.8 Concrete Culvert, includes frame culvert 89,624 2,038 2.3 3.3 Prestressed Concrete Stringer/multi-beam or girder 54,317 383 0.71 0.63 Steel Continuous Stringer/multi-beam or girder 47,005 2,710 5.8 4.4 Prestressed Concrete Box beam or girders -- Multiple 40,686 710 1.7 1.2 Concrete Slab 33,123 3,907 11.8 6.4 Concrete Continuous Slab 31,940 1,489 4.7 2.4 Concrete Continuous Culvert, includes frame culvert 27,795 215 0.77 0.35 Concrete Tee beam 20,295 1,997 9.8 3.3 Wood or Timber Stringer/multi-beam or girder 18,180 9,373 51.6 15.4 TABLE 22 TEN MOST NUMEROUS STRUCTURE TYPES AND LOAD POSTING Item 92A Fracture Critical Details Structures Posted % of Group Posted % of Load Yes 20,828 7,440 35.7 12.2 No 588,892 53,597 9.1 87.8 TABLE 24 LOAD POSTING AND FRACTURE CRITICAL DETAILS Structure Material Structures Posted % of Group % of Load Posted Design Load H15 or Lower Concrete 55,057 6,273 11.4 10.3 Prestressed Concrete 6,829 781 11.4 1.3 Steel 23,538 7,392 31.4 12.1 Timber 5,369 2,909 54.2 4.8 Masonry 370 39 10.5 0.1 Aluminum, Iron 56 26 46.4 0.0 Other 22 2 9.1 0.0 TABLE 25 LOAD POSTING AND STRUCTURE MATERIAL FOR DESIGN LOAD H15 OR LOWER
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Item 63 Method Used to Determine Operating Rating NBI Code Structures Posted % of Group % of Load Posted Field evaluation and engineering judgment 0 14,294 340 2.4 0.6 Load Factor Rating (LFR) 1 320,833 24,346 7.6 39.9 Allowable Stress Rating (ASR)
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13 Item 63 Method Used to Determine Operating Rating NBI Code Bridges Posted for Load % of Group % of Posted Bridges Load Rating Computation 1, 2, 3, 6, 7, 8, A, B, C, D, E, F 429,460 54,426 12.7 93.3 Field Evaluation and Engineering Judgment 0 3,684 285 7.7 0.5 No Rating Analysis Performed 5 41,254 3,594 8.7 6.2 Load Testing 4 464 34 7.3 0.1 TABLE 28 LOAD POSTING AND METHOD USED TO DETERMINE OPERATING RATING -- BRIDGES ONLY TABLE 29 LOAD POSTING AND METHOD USED TO DETERMINE OPERATING RATING -- CULVERTS ONLY Item 63 Method Used to Determine Operating Rating NBI Code Culverts Posted for Load % of Group % of Posted Culverts Load Rating Computation 1, 2, 3, 6, 7, 8, A, B, C, D, E, F 69,509 2,123 3.1 78.7 Field Evaluation and Engineering Judgment 0 10,610 55 0.5 2.0 No Rating Analysis Performed 5 54,611 515 0.9 19.1 Load Testing 4 89 3 3.4 0.1 TABLE 30 LOAD POSTING AND OPERATING RATING Operating Rating Minimum, kip GVW Equivalent Structures Posted for Load % of Group % of Load Posted Less than 6 2,668 2,043 76.6 3.3 6 15,314 13,673 89.3 22.4 30 H15 11,901 7,952 66.8 13.0 40 H20 16,304 9,014 55.3 14.8 50 Type 3 77,610 17,295 22.3 28.3 72 Type 3S2 27,641 3,172 11.5 5.2 80 Type 3-3 170,525 4,988 2.9 8.2 100 and Greater 276,570 2,739 1.0 4.5 Among structures with no load rating analysis or load rating by FE/EJ, 4% are posted for load. ORGANIZATION OF THE SYNTHESIS REPORT This report is presented as a summary, four chapters and two appendices, as follows: Chapter One: Status of Bridge Posting for Load in the United States presents information from the NBI for reporting year 2012 (1)
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14 Definitions, Abbreviations, and Acronyms provides definitions of terms, and the meanings of abbreviations and acronyms used in this synthesis report. References: A comprehensive listing of the references cited in the text.
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