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https://hdl.handle.net/11681/40422
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DC Field | Value | Language |
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dc.contributor.author | Lozano, Christine M. | - |
dc.contributor.author | Riveros, Guillermo A. | - |
dc.date.accessioned | 2021-04-26T15:12:38Z | - |
dc.date.available | 2021-04-26T15:12:38Z | - |
dc.date.issued | 2021-04 | - |
dc.identifier.govdoc | ERDC/ITL TR-21-3 | - |
dc.identifier.uri | https://hdl.handle.net/11681/40422 | - |
dc.identifier.uri | http://dx.doi.org/10.21079/11681/40422 | - |
dc.description | Technical Report | - |
dc.description.abstract | Most 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.sponsorship | Navigation Systems Research Program (U.S.) | en_US |
dc.description.tableofcontents | Abstract ................................................................................................................................................... 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 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dc.format.extent | 139 pages / 9.94 MB | - |
dc.format.medium | - | |
dc.language.iso | en_US | en_US |
dc.publisher | Information Technology Laboratory (U.S.) | en_US |
dc.publisher | Engineer Research and Development Center (U.S.) | - |
dc.relation.ispartofseries | Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC/ITL TR-21-3 | - |
dc.rights | Approved for Public Release; Distribution is Unlimited | - |
dc.source | This Digital Resource was created in Microsoft Word and Adobe Acrobat | - |
dc.subject | Hydraulic structures--Maintenance and repair | en_US |
dc.subject | Service life (Engineering) | en_US |
dc.subject | Steel, Structural--Fatigue | en_US |
dc.subject | Steel, Structural--Fracture | en_US |
dc.title | Classical and innovative methods of fatigue and fracture repairs in navigation steel structures | en_US |
dc.type | Report | en_US |
Appears in Collections: | Technical Report |
Files in This Item:
File | Description | Size | Format | |
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ERDC-ITL TR-21-3.pdf | 9.94 MB | Adobe PDF | View/Open |