Evaluation of bridge replacement alternatives for the county bridge system.

755932277Final report.PDFTech ReportIowa DOT Project HR-365BridgesMaintenanceEvaluationIowaIowa State UniversityWipf, T. J.Klaiber, F. W.Prabhakaran, A.Iowa State UniversityIowa. Highway DivisionIowa. Highway Research BoardNTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and StructuresNTL-HIGHWAY/ROAD TRANSPORTATION-Construction and MaintenanceUS Transportation CollectionRecent reports have indicated that 23.5 percent of the nation's highway bridges arestructurally deficient and 17.7 percent are functionally obsolete. A significant number of these bridgesare on the Iowa county road system. The objective of the investigation described in this report wasto identify, review and evaluate replacement bridges currently being used by various counties in Iowaand surrounding states. Iowa county engineers, county engineers in neighboring states as well asprivate manufacturers of bridge components, and regional precadprestressed concrete manufacturerswere contacted to determine the most common replacement bridge types being used. Dependingupon the frndigs of the review, possible improvements and/or new replacement bridge systems wereto be proposed