?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F6319%2F&rft.title=Structural+Repair+of+Prestressed+Concrete+Bridge+Girders&rft.creator=Kasan%2C+Jarret+Lee&rft.description=It+is+common+practice+that+aging+and+structurally+damaged+prestressed+concrete+bridge+members+are+taken+out+of+service+and+replaced.+This%2C+however%2C+is+not+an+efficient+use+of+materials+and+resources+since+the+member+can+often+be+repaired+in+situ.+There+are+numerous+repair+techniques+proposed+by+entrepreneurial+and+academic+institutions+which+restore+prestressed+concrete+girder+flexural+strength+and+save+both+material+and+economic+resources.+Of+course%2C+not+all+repair+methods+are+applicable+in+every+situation+and+thus+each+must+be+assessed+based+on+girder+geometry+and+the+objectives+of+the+repair+scenario.+This+document+focuses+on+the+practical+application+of+prestressed+concrete+bridge+girder+repair+methods.+In+this+document%2C+repair+methods+are+presented+for+three+prototype+prestressed+concrete+highway+bridge+girder+shapes%3A+adjacent+boxes+(AB)%2C+spread+boxes+(SB)%2C+and+AASHTO-type+I-girders+(IB)%2C+having+four+different+damage+levels.+A+total+of+22+prototype+repair+designs+are+presented.+Although+not+applicable+to+all+structure+types+or+all+damage+levels%2C+the+repair+techniques+covered+include+the+use+of+carbon+fiber+reinforced+polymer+(CFRP)+strips%2C+CFRP+fabric%2C+near-surface+mounted+(NSM)+CFRP%2C+prestressed+CFRP%2C+post-tensioned+CFRP%2C+strand+splicing+and+external+steel+post-tensioning.+It+is+the+author's+contention+that+each+potential+structural+repair+scenario+should+be+assessed+independently+to+determine+which+repair+approach+is+best+suited+to+the+unique+conditions+of+a+specific+project.+Therefore%2C+no+broad+classifications+have+been+presented+directly+linking+damage+level+(or+a+range+of+damage)+to+specific+repair+types.+Nonetheless%2C+it+is+concluded+that+when+25%25+of+the+strands+in+a+girder+no+longer+contribute+to+its+capacity%2C+girder+replacement+is+a+more+appropriate+solution.Guidance+with+respect+to+inspection+and+assessment+of+damage+to+prestressed+concrete+highway+bridge+girders+and+the+selection+of+a+repair+method+is+presented.+These+methods+are+described+through+22+detailed+design+examples.+Based+on+these+examples%2C+review+of+existing+projects+and+other+available+data%2C+a+detailed+review+of+selection+and+performance+criteria+for+prestressed+concrete+repair+methods+is+provided.&rft.date=2009-06-29&rft.type=University+of+Pittsburgh+ETD&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fd-scholarship-dev.library.pitt.edu%2F6319%2F1%2FKasan_Thesis_2009.pdf&rft.identifier=++Kasan%2C+Jarret+Lee++(2009)+Structural+Repair+of+Prestressed+Concrete+Bridge+Girders.++Master's+Thesis%2C+University+of+Pittsburgh.++++(Unpublished)++