Inspection and Management of Bridges with Fracture-Critical Details (2005) / Chapter Skim
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Appendix B - Survey Questionnaire
Appendix B - Survey Questionnaire
Pages 57-66
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From page 57... ...
One of the objectives of this survey is to gather information on fracture-critical structures and how bridge owners define, identify, inspect, and manage FCBs. Notes for Completing this Survey A copy of this survey should be given to all departments within your agency that have significant experience with FCBs (e.g., designers, inspectors, district bridge engineers)
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CHAPTER 10. Description Fracture Critical Yes No Two girder bridges 38 0 Three girder bridges 9 28 Three girder bridges with girder spacing > ______ ft 10 21 Multi-girder bridges with girder spacing >_______ft 3 32 Truss bridges 34 3 Two girder bridges fabricated using HPS 70W 31 1 Truss bridges fabricated using HPS 70W steel 28 2 Single steel "tub" girder bridges 32 5 Twin steel "tub" girder bridges 22 12 Multi-steel "tub" girder bridges 0 34 Other (post-tensioned, timber, steel cross girders, etc.)
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From page 59... ...
<1% Other welded girder systems considered fracture critical 8.6% Riveted two-girder system <1% Riveted three-girder system <1% Other riveted girder systems considered fracture critical 30.9% Riveted truss bridges with two truss lines 3.8% Welded truss bridges with two truss lines (with bolted or welded field splices) 1.6% Welded and bolted truss bridges with two truss lines 28% Bridges with steel pier caps 1.5% Bridges with pin and hanger systems 6.1% Bridges with steel cross girders <1% Bridges with single steel tub girders <1% Bridges with twin steel tub girders 1.1% Bridges with multi-steel tub girders 7.5% Other steel bridges considered fracture critical Please describe: Steel cross girders, cable supported, tied arch.
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17 No 23 Yes If yes, please describe below: Examples given: NHI, in-house training, FCB inspection team lead must have experience and in most cases be a PE.
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17. It is commonly observed that by using simplified structural analysis methods the calculations for many bridges indicate no remaining fatigue life or even "negative" fatigue life.
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Owners indicated that these additional efforts are undertaken on a case-by-case basis. Influencing factors are structure size, age, average daily traffic, type of fatigue details on the bridge, overall condition (including fatigue problems)
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(Please provide information for each failure.) 11 No 2 Yes If yes, how many?
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ID No ID Yes If yes, how many? ______________ (Please provide information for each failure.)
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Some examples are provided below that can simply be checked. 8 Develop guidelines related to advanced structural analysis procedures to better predict service load behavior in fracture-critical bridges.
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_____ No _____ Yes If yes, please describe below. • Develop methods to establish inspection intervals and criteria based on ADT/ADTT, age, detail types, existing condition, etc.
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