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End region detailing of pretensioned concrete bridge girders.
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Filetype[PDF-2.65 MB]

  • Publication/ Report Number:
    UF Project No. 00072910 ; UF Project No. 00074016 ;
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  • Abstract:
    End region detailing has significant effect on the serviceability, behavior, and capacity of pretensioned concrete girders.

    In this project, experimental and analytical research programs were conducted to evaluate and quantify the effects of

    different end region detailing schemes. Two end region design models were developed using results from the experimental

    and analytical programs. The first model can be used to design confinement reinforcement to prevent lateral-splitting failure

    at ultimate strength. The second model focuses on serviceability criteria and can be used to calculate bottom flange stresses

    due to prestressing and thereby assess the likelihood of bottom flange cracking in the end region.

    The experimental program was conducted using (14) Florida I-Beam (FIB) specimens. Cracking and strain data were

    collected during prestress transfer and during the months following transfer. These data were used to evaluate serviceability

    criteria. Following serviceability evaluations, specimens were load tested to determine capacity and behavior due to applied

    loads. Specimens were loaded in three-point bending at a shear-span-to-depth (a/d) ratio of approximately 2.0. Variables

    considered in the experimental work included confinement reinforcement, steel bearing plates, horizontal reinforcement,

    vertical reinforcement, strand quantity, strand shielding, and strand layout.

    The analytical program was conducted using finite element analysis (FEA). FEA models were validated using data from

    the experimental program. Variables considered in the analytical program included bearing pad geometry, bearing pad

    stiffness, steel bearing plates, transfer length, and prestress release sequence.

    A test program was also conducted to evaluate the shear strength of 1950s era pretension girders used in the Florida

    highway system. These girders are of interest because they have thin 4 in. webs and very little specified shear

    reinforcement. Six test girders were removed from an existing bridge and were tested to failure in the laboratory. Results

    from the testing will be useful in determining the shear strength of similar pretensioned girders.

    Recommendations are provided with regard to detailing of confinement reinforcement, embedded bearing plates, strand

    shielding, and crack control. Recommendations are also given regarding evaluation of early pretensioned girders.

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