1. ERDC Knowledge Core
  2. Engineer Research and Development Center (ERDC)
  3. Geotechnical and Structures Laboratory (GSL) - (2/23/2001 - present)
  4. Publication
  5. Technical Report
Please use this identifier to cite or link to this item: https://hdl.handle.net/11681/40025
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dc.contributor.authorTrim, M. W. (Michael Wesley), 1981--
dc.contributor.authorMurray, Matthew P.-
dc.contributor.authorCrane, C. Kennan.-
dc.date.accessioned2021-03-19T19:37:16Z-
dc.date.available2021-03-19T19:37:16Z-
dc.date.issued2021-03-
dc.identifier.govdocERDC/GSL TR-21-4-
dc.identifier.urihttps://hdl.handle.net/11681/40025-
dc.identifier.urihttp://dx.doi.org/10.21079/11681/40025-
dc.descriptionTechnical Report-
dc.description.abstractA modernized Overhead Cable System prototype for a 689 ft (210 m) Improved Ribbon Bridge crossing was designed, assembled, and structurally tested. Two independent structural tests were executed, i.e., a component-level compression test of the BSS tower was performed to determine its load capacity and failure mode; and a system-level ‘dry’ test of the improved OCS prototype was conducted to determine the limit state and failure mode of the entire OCS. In the component-level compression test of the BSS tower, the compressive capacity was determined to be 102 kips, and the failure mode was localized buckling in the legs of the tower section. During system-level testing, the prototype performed well up to 40.5 kips of simulated drag load, which corresponds to a uniformly distributed current velocity of 10.7 ft/s. If a more realistic, less conservative parabolic velocity distribution is assumed instead, the drag load for an 11 ft/s current is 21.1 kips. Under this assumption, the improved OCS prototype has a factor of safety of 1.9, based on a 689-ft crossing and 11-ft/s current. The OCS failed when one of the tower guy wires pulled out of the ground, causing the tower to overturn.en_US
dc.description.sponsorshipU.S. Army Product Manager Bridging.en_US
dc.description.tableofcontentsContents Abstract .................................................................................................................................... ii Figures and Tables ................................................................................................................... v Preface ...................................................................................................................................viii 1 Introduction ...................................................................................................................... 1 1.1 Background ........................................................................................................ 1 1.2 Objective............................................................................................................. 3 1.3 Approach ............................................................................................................ 3 2 Improved OCS prototype development .......................................................................... 5 2.1 Design procedure .............................................................................................. 5 2.1.1 Main Anchor (Catenary) Cable ................................................................................... 6 2.1.2 Bridle line connections ............................................................................................... 9 2.1.3 BSS towers ................................................................................................................ 11 2.1.4 Anchorage ................................................................................................................. 13 2.1.5 Catenary tensioning .................................................................................................. 22 2.2 Prototype design summary ............................................................................ 23 3 Component-level testing of the BSS tower ................................................................. 29 3.1 Overview of BSS tower ................................................................................... 29 3.2 BSS tower testing methodology ..................................................................... 30 3.2.1 Test arrangement ...................................................................................................... 30 3.2.2 Instrumentation and data collection ........................................................................ 33 3.2.3 Test procedure .......................................................................................................... 37 3.3 BSS tower test results and discussion ........................................................... 37 3.3.1 Time history data....................................................................................................... 37 3.3.2 BSS tower capacity and compressive failure mode ................................................ 41 3.4 Component-level testing summary and conclusions .................................... 43 4 System-level testing of the improved overhead cable system prototype ................ 44 4.1 Full-scale OCS testing methodology .............................................................. 44 4.1.1 Testing approach ...................................................................................................... 44 4.1.2 Test arrangement and procedure ............................................................................ 46 4.1.3 Instrumentation ......................................................................................................... 48 4.2 OCS test results and discussion .................................................................... 53 4.2.1 Failure mode ............................................................................................................. 62 4.2.2 BSS tower load analysis ........................................................................................... 65 4.3 Loading equivalents for uniform versus parabolic river current distributions .............................................................................................................. 68 4.4 System-level testing summary and conclusions ............................................ 71 5 Summary and conclusions ............................................................................................ 72 5.1 Summary of unresolved issues with the improved OCS prototype .............. 72 5.1.1 Helical anchors unable to penetrate all soil types .................................................. 72 5.1.2 Synthetic rope constructional elongation ................................................................ 73 5.1.3 BSS tower modifications ........................................................................................... 74 5.1.4 Differing bank heights .............................................................................................. 79 5.1.5 Approach guys and downstream anchorage ........................................................... 80 5.1.6 Optimal OCS configurations for various crossings .................................................. 80 5.1.7 Effects of vehicular loading on the OCS .................................................................. 81 5.1.8 OCS scalability ........................................................................................................... 81 5.2 Conclusions ..................................................................................................... 82 References ............................................................................................................................. 85 Unit Conversion Factors ....................................................................................................... 86 Report Documentation Page-
dc.format.extent98 pages / 22.95 MB-
dc.format.mediumPDF-
dc.language.isoen_USen_US
dc.publisherGeotechnical and Structures 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/GSL TR-21-4-
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectMilitary bridgesen_US
dc.subjectStream crossingen_US
dc.subjectStream crossing, Militaryen_US
dc.subjectStructural analysis (Engineering)en_US
dc.subjectTransportationen_US
dc.subjectTransportation, Militaryen_US
dc.subjectImproved Ribbon Bridgeen_US
dc.subjectAnchorage (Structural engineering)en_US
dc.subjectMilitary bridges--Cablesen_US
dc.subjectBridge Supplemental Seten_US
dc.subjectOverhead Cable Systemen_US
dc.titleModernization and structural evaluation of the improved Overhead Cable Systemen_US
dc.typeReporten_US
Appears in Collections:Technical Report

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