VTechWorks staff will be away for the Thanksgiving holiday starting Wednesday afternoon, Nov. 25, through Sunday Nov. 29, and will not be replying to requests during this time. Thank you for your patience.

Show simple item record

dc.contributor.authorHickey, Lucas Jamesen_US
dc.date.accessioned2014-03-14T20:34:55Z
dc.date.available2014-03-14T20:34:55Z
dc.date.issued2008-04-22en_US
dc.identifier.otheretd-05032008-143006en_US
dc.identifier.urihttp://hdl.handle.net/10919/32154
dc.description.abstract

This thesis presents the methods utilized to model a steel deck truss bridge over the New River in Hillsville, Virginia. These methods were evaluated by comparing analytical results with data recorded from 14 members during live load testing. The research presented herein is part of a larger endeavor to understand the structural behavior and collapse mechanism of the erstwhile I-35W bridge in Minneapolis, MN. Objectives accomplished toward this end include investigation of lacing effects on built up member strain detection, live load testing of a steel truss bridge, and evaluating modeling techniques in comparison to recorded data.

Before any live load testing could be performed, it was necessary to confirm an acceptable strain gage layout for measuring member strains. The effect of riveted lacing in built-up members was investigated by constructing a two-thirds mockup of a typical bridge member. The mockup was then instrumented with strain gages and subjected to known strains in order to determine the most effective strain gage arrangement. Testing analysis concluded that for a built up member consisting of laced channels, one strain gage installed on the middle of the extreme fiber of each channelâ s flanges was sufficient. Thus, laced members on the bridge were mounted with four strain gages each.

Data from live loads were obtained by loading two trucks to 25 tons each. Trucks were positioned at eight locations on the bridge in four different relative truck positions. Data were recorded continuously and reduced to member forces for model validation comparisons. Deflections at selected truss nodes were also recorded for model validation purposes.

The model validation process began by developing four simple truss models, each reflecting different expected restraint conditions, in the hopes of bracketing data from recorded results. Models were refined to frames, and then frames including floor beams and stringers for greater accuracy. The final, most accurate model was selected and used for a failure analysis. This model showed where the minimum amount of load could be applied in order to learn about the bridgeâ s failure behavior, for a test to be conducted at a later time.

en_US
dc.publisherVirginia Techen_US
dc.relation.haspartLJHickeyETD3.pdfen_US
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectmodel validationen_US
dc.subjectlacing of built-up membersen_US
dc.subjectsteel deck trussen_US
dc.subjectsensitivity analysisen_US
dc.titleModel Validation for a Steel Deck Truss Bridge over the New Riveren_US
dc.typeThesisen_US
dc.contributor.departmentCivil Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineCivil Engineeringen_US
dc.contributor.committeechairRoberts-Wollmann, Carin L.en_US
dc.contributor.committeememberSotelino, Elisa D.en_US
dc.contributor.committeememberCousins, Thomas E.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05032008-143006/en_US
dc.date.sdate2008-05-03en_US
dc.date.rdate2008-05-26
dc.date.adate2008-05-26en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record