End region detailing of pretensioned concrete bridge girders, appendix B : small beam tests.

PDFOtherhttp://ntl.bts.gov/lib/47000/47400/47427/FDOT-BDK75-977-05-rpt.pdfUF Project No. 00072910UF Project No. 00074016BDK75 977-05Prestressed concreteGirdersServiceabilityBridge designPretensioningShear strengthReinforcement (Engineering)Load testsFinite element methodFloridaFlorida. Dept. of TransportationHamilton, H.R.Consolazio, Gary R.Ross, Brandon E.University of Florida. Dept. of Civil and Coastal EngineeringNTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and StructuresNTL-HIGHWAY/ROAD TRANSPORTATION-DesignNTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and PerformanceUS Transportation CollectionThe AASHTO LRFD Bridge Design Specifications (2007) require that confinementreinforcement be placed around prestressing strands in the bottom bulb of pretensioned concretebeams. Although the AASHTO specifications contain prescriptive requirements for the quantityand placement of confinement reinforcement, the effect of such reinforcement on the end regionbehavior is not well understood.To evaluate the function and effect of confinement reinforcement, load tests wereconducted using 28-in. deep precast-pretensioned beams. In total, twelve tests were conductedwith each specimen loaded in three-point bending at a shear span-to-depth ratio of 1.0. Load,displacement, and strain data were collected during each test. Variables in the test programincluded strand size, strand quantity, prestressing force, and the presence or lack of confinementreinforcement