Volume 1-3 : Field testing of a precast concrete bridge : Boone County bridge

US Transportation Collection2009PDFTech ReportWipf, Terry J.Klaiber, F. WayneHockerman, SamanthaBowers, Ryan P.Becker, MatthewPhares, BrentBridge Engineering CenterIowa. Highway Research BoardIowa. Dept. of TransportationIowa State University. Center for Transportation Research and EducationIowa State University. Center for Transportation Research and EducationIowaPrecast concreteAccelerated testsStrength of materialsPile capsPiers (Supports)Bridge piersBridges--Iowa--AbutmentsPrecast concrete construction--IowaGirders--TestingIHRB Project TR-561CTRE Project 06-262Final report.Vol. 1-1: In July 2006, construction began on an accelerated bridge project in Boone County, Iowa that was composed of precast substructure elements and an innovative, precast deck panel system. The superstructure system consisted of full-depth deck panels that were prestressed in the transverse direction, and after installation on the prestressed concrete girders, post-tensioned in the longitudinal direction. Prior to construction, laboratory tests were completed on the precast abutment and pier cap elements. The substructure testing was to determine the punching shear strength of the elements. Post-tensioning testing and verification of the precast deck system was performed in the field. The forces in the tendons provided by the contractor were verified and losses due to the post-tensioning operation were measured. The stress (strain) distribution in the deck panels due to the post-tensioning was also measured and analyzed. The entire construction process for this bridge system was documented. Representatives from the Boone County Engineers Office, the prime contractor, precast fabricator, and researchers from Iowa State University provided feedback and suggestions for improving the constructability of this design; Vol. 1-2: This second section of Volume 1 focuses on the laboratory testing of full-depth precast, prestressed concrete deck panels used in the construction of a continuous four-girder, three span bridge over Squaw Creek on 120th Street in Boone County, Iowa. Various laboratory tests were conducted on a single panel and on two panels connected by a closure pour. These tests ranged from determining physical properties of the panel (compressive strength and prestressing force), to determining the panel's response in various circumstances (moving with a crane, during field leveling, and under loading). This report details the results of these laboratory tests; and, Vol. 1-3: A full-depth precast deck bridge was built in Boone County in 2006 as a replacement for an existing bridge. The bridge was constructed in an accelerated manner using precast concrete components. A series of laboratory tests were completed by Iowa State University on individual segments of the bridge. Detailed description and analysis of these tests can be found in sections 1 and 2 of Volume 1. This third and final section of Volume 1 documents the field testing portion of this project. Two field tests were carried out on the Boone County bridge. The first took place the summer following construction and the second took place one year later. A summary of the testing process, instrumentation plan, and analysis of data are located in this report.120