Unbonded Monostrands for Camber Adjustment

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dc.contributor.authorSethi, Viveken
dc.contributor.committeecochairRojiani, Kamal B.en
dc.contributor.committeecochairRoberts-Wollmann, Carin L.en
dc.contributor.committeememberWeyers, Richard E.en
dc.contributor.departmentStructural Engineering and Materialsen
dc.date.accessioned2014-03-14T20:32:08Zen
dc.date.adate2006-03-15en
dc.date.available2014-03-14T20:32:08Zen
dc.date.issued2006-02-13en
dc.date.rdate2006-03-15en
dc.date.sdate2006-02-24en
dc.description.abstractPrestressed concrete structural members camber upwards or downwards depending upon the location of application of prestress force. Identical members do not camber equally due to variability of the factors influencing it. Differential camber in the beams, if significant, results in excessively tall haunches or girder top flange extending into the bottom of the slab. For adjacent members like deck bulb-tees and box girders that are to be transversely post-tensioned the differential camber causes problems during the fit up process. This variation is undesirable and hinders the smooth progress of construction work if not properly accounted for at the design stage. Various factors influence camber and camber growth in prestressed members. Some of the factors are concrete strength and modulus, concrete creep and shrinkage properties, curing conditions, maturity of concrete at release of prestress force, initial strand stress, climatic conditions in storage and length of time in storage. Combinations of these variables result in variation of camber of otherwise similar beams at the time they are erected. One way to increase the precision of camber estimation is to use Monte Carlo simulation based upon the randomized parameters affecting the camber and camber growth. In this method, the parameters, in the form of a probability distribution function, are combined and passed through a deterministic model resulting in camber and camber growth prediction with narrowed probability bounds as compared to single definite value given by most contemporary methods. This outcome gives the expected range of cambers for a given girder design. After determining the expected range of camber, the ultimate goal is to provide guidelines for using unbonded monostrands for camber adjustment.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-02242006-142346en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-02242006-142346/en
dc.identifier.urihttp://hdl.handle.net/10919/31335en
dc.publisherVirginia Techen
dc.relation.haspartVivek2.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectProbability distributionen
dc.subjectPrediction modelsen
dc.subjectMonte Carlo Simulationen
dc.subjectCamberen
dc.subjectCreepen
dc.subjectShrinkageen
dc.subjectHigh strength concreteen
dc.subjectUnbonded monostrandsen
dc.titleUnbonded Monostrands for Camber Adjustmenten
dc.typeThesisen
thesis.degree.disciplineStructural Engineering and Materialsen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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