Inspection Guidelines for Bridge Post-Tensioning and Stay Cable Systems Using NDE Methods (2017) / Chapter Skim
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Pages 27-37
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From page 27... ...
27 Condition Assessment of Post-Tensioning and Stay Cable Systems Introduction This chapter presents information critical for the condition assessment of post-tensioning and stay cable systems. This chapter, along with the various supporting appendices presented, could be used for the condition assessment post-tensioning and stay cable systems.
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From page 28... ...
28 necessary adjustments to the inspection technique, if the situation warrants. Apart from being qualified to operate the equipment for inspection, the inspector should also be well equipped with using the required data analysis software and techniques for the proper interpretation of data.
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29 hierarchy process, revised analytic hierarchy process, ELECTRE (Elimination and Choice for Reality, translated from French) method, and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS)
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30 Ease of Use Ease of use is measured by power demand (direct power, battery-powered, etc.) and personnel required (large crew, two to three personnel, automated testing, manual testing, etc.)
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31 inspection (in USD per linear ft of stay cable or external PT, and per ft2 of concrete surface for internal PT and anchorage regions)
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32 duct, an external duct, or an anchorage region. Based on the choice made between internal and external ducts, different ranked NDE methods are presented for metal and nonmetal ducts.
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33 ing procedure and the overall accuracy of each of the methods that can detect compromised grout are included in parentheses. As a first step in using the flowchart, it is important that the inspector collects bridge structure files in order to determine certain important parameters such as the location of the ducts (internal/external)
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34 However, if it is established that the external tendons are to be inspected for compromised grout, based on the duct material another set of NDE methods are suggested. If the external duct is metallic, then sounding is the only NDE method available for detecting compromised grout.
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35 • Capabilities and limitations: Perhaps one of the most important components of the testing procedures, this section allows the end user to determine whether or not the most optimal method chosen by the ranked methods is actually suitable for the specific inspection application. As the rankings were scored using defined typical conditions, the following categories are discussed to explain the technology's capabilities and limitations in light of different physical parameters that may exist.
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From page 36... ...
36 Start testing procedure Enter span and ensure marking system exists relative to station marking Perform preliminary walk-through inspection, noting damage indicators Power on necessary tools/equipment and calibrate per manufacturer's recommendation Submit completed inspection form to inspection program manager Inspection complete for all selected span/sections? Go to next span Yes No No Yes Has ambient temperature or humidity varied since last test?
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From page 37... ...
37 NDE method Reference GPR Appendix C – TP01 IRT Appendix C – TP02 ECT Appendix C – TP03 MFL Appendix C – TP04 MMFM-Permanent Magnet Appendix C – TP05 MMFM-Solenoid Appendix C – TP06 IE Appendix C – TP07 UST Appendix C – TP08 USE Appendix C – TP09 S/UPV Appendix C – TP10 LFUT Appendix C – TP11 Sounding Appendix C – TP12 EIS Appendix C – TP13 GPR/USE Appendix C – TP14 GPR/IE Appendix C – TP15 MFL/Sounding Appendix C – TP16 MFL/IE Appendix C – TP17 IRT/USE Appendix C – TP18 VT Appendix C – TP19 Table 5-6. References to testing procedures for the various NDE methods.
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