Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/40422
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dc.contributor.authorLozano, Christine M.-
dc.contributor.authorRiveros, Guillermo A.-
dc.date.accessioned2021-04-26T15:12:38Z-
dc.date.available2021-04-26T15:12:38Z-
dc.date.issued2021-04-
dc.identifier.govdocERDC/ITL TR-21-3-
dc.identifier.urihttps://hdl.handle.net/11681/40422-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/40422-
dc.descriptionTechnical Report-
dc.description.abstractMost of the hydraulic steel structures (HSS) in the U.S. have reached or have past their design life, which leads to unsatisfactory performance. Welded connections with low fatigue resistance, poor weld quality, unanticipated structural behavior, or unexpected loading due to the deterioration of the design boundary conditions are the causes of fatigue cracking. The purpose of this report is to identify and evaluate the traditional and new methods used for fatigue and fracture repairs in navigation steel structures to restore their load carrying capacity and fatigue and fracture resistance. The final objective was to generate a guidance report comprising of recommended and more efficient repair methods for the different fatigue limit states observed in navigation steel structures.en_US
dc.description.sponsorshipNavigation Systems Research Program (U.S.)en_US
dc.description.tableofcontentsAbstract ................................................................................................................................................... ii Figures and Tables .................................................................................................................................. v Preface .................................................................................................................................................. viii 1 Introduction ..................................................................................................................................... 1 1.1 Objectives ....................................................................................................................... 1 1.2 Research significance and Army benefits .................................................................... 2 1.3 Overview ......................................................................................................................... 2 2 Fatigue and Fracture Theory ......................................................................................................... 4 2.1 Modes of fracture .......................................................................................................... 5 2.1.1 Mode I ............................................................................................................................. 6 2.1.2 Mode II ............................................................................................................................ 6 2.1.3 Mode III ........................................................................................................................... 7 2.1.4 Mix mode ........................................................................................................................ 8 2.2 Crack growth .................................................................................................................. 9 2.2.1 Griffiths energy release rate ........................................................................................ 10 2.2.2 Stress intensity factor .................................................................................................. 11 2.3 Fatigue ......................................................................................................................... 12 2.4 Toughness .................................................................................................................... 19 2.5 Welds ............................................................................................................................ 20 2.5.1 Weld profiles ................................................................................................................. 21 2.5.2 Weld defects ................................................................................................................. 22 2.5.3 Weld acceptance criteria ............................................................................................. 23 2.5.4 Example of bad weld profiles ...................................................................................... 30 2.6 Holes ............................................................................................................................ 31 3 A Guide to a Fitness-For-Purpose Report .................................................................................. 33 3.1 Fitness for purpose: BS7910 ...................................................................................... 34 3.2 Fitness for purpose: Failure assessment options ...................................................... 35 3.3 Fitness for purpose: Variables .................................................................................... 38 3.4 FFS: Option 1 ............................................................................................................... 39 4 Application of Finite Elements .................................................................................................... 50 5 Fatigue Repairs ............................................................................................................................ 52 5.1 Crack detection techniques ........................................................................................ 52 5.2 Current crack repair and retrofit methods ................................................................. 58 5.2.1 Surface treatments ...................................................................................................... 58 5.2.2 Hole drilling ................................................................................................................... 61 5.2.3 Vee-and-weld ................................................................................................................ 65 5.2.4 Doubler/splice plates .................................................................................................. 65 5.2.5 Post-tensioning ............................................................................................................. 66 5.2.6 Detail modification ....................................................................................................... 67 5.3 Underwater crack repair and retrofit methods .......................................................... 69 5.4 Innovative crack repair and retrofit research and methodologies ............................ 69 5.4.1 Fiber Reinforced Polymer (FRP) .................................................................................. 70 5.4.2 FRP repairs ................................................................................................................... 71 5.4.3 Shape Memory Alloys (SMA) ........................................................................................ 76 5.5 Comparison of repair and retrofit methodologies ..................................................... 77 6 Discussion and Conclusions ....................................................................................................... 79 References ............................................................................................................................................ 80 Appendix A ............................................................................................................................................ 87 Appendix B .......................................................................................................................................... 107 Acronyms ........................................................................................................................................... 126 Report Documentation Page-
dc.format.extent139 pages / 9.94 MB-
dc.format.mediumPDF-
dc.language.isoen_USen_US
dc.publisherInformation Technology Laboratory (U.S.)en_US
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesTechnical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/ITL TR-21-3-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectHydraulic structures--Maintenance and repairen_US
dc.subjectService life (Engineering)en_US
dc.subjectSteel, Structural--Fatigueen_US
dc.subjectSteel, Structural--Fractureen_US
dc.titleClassical and innovative methods of fatigue and fracture repairs in navigation steel structuresen_US
dc.typeReporten_US
Appears in Collections:Technical Report

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