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Experimental and Analytical Study of a Post-Tensioned Bridge

File Language:
English


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  • Creators:
  • Corporate Creators:
    Texas A&M University System. Texas Transportation Institute
  • Corporate Contributors:
  • Subject/TRT Terms:
  • Publication/ Report Number:
    FHWA/TX-88/1182-3
  • Resource Type:
    Tech Report
  • Geographical Coverage:
  • Edition:
    Interim Report September, 1987-August, 1991
  • Corporate Publisher:
    Texas. Department of Transportation
  • Abstract:
    This is the third in a series of reports documenting a research program aimed at detailed investigation of bridge structures with moderately thick slabs resting directly on columns without bent caps. Post-tensioning is employed in the longitudinal and transverse directions. Longitudinal post-tensioning is uniformly distributed across the width of the bridge; transverse post-tensioning is employed only in column regions. Two scaled laboratory models, named Model One and Model Two, are being tested, along with instrumentation of an actual bridge in Wichita Falls, Texas. This report relates to the field study portion of this project. The purpose of instrumenting the Brook Street Overpass bridge is to verify deflections and strains predicted by a finite element program, that is proposed as a general purpose design tool for flat plate bridges. Stresses in the field bridge are indirectly measured by a large array of strain gages attached to pencil bars that are embedded in the concrete. Deflections and temperatures of the slab are also monitored. Data due to dead load are acquired immediately after the concrete pour, after longitudinal prestressing, and for a period of two and one-half years. For live load testing, a three-axle dump truck is placed on the bridge at nine different locations. Comparisons of deflections and strains that result from existing analytical methods and actual bridge responses are presented. Results indicate that a simplified analytical method does not yield predictions that are consistent with experimental measurements for service load conditions. Some assumptions often used in designing transverse prestressing are shown to be incompatible with experimental and finite element predictions. Simplified assumptions concerning distribution of transverse prestressing forces into the slab are evaluated. Placement of transverse post-tensioning exclusively on the column bents is evaluated and uniform distribution of transverse post-tensioning tendons is recommended to prevent occurrence of longitudinal cracking.
  • Format:
    PDF
  • Funding:
    2-5-88/0-1182
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:903f7cbd63049bd1357b955633878af535036b732dfd8570efb1b4dc7e2f7eff1dac64bb0acdcffed339cdbc79844c8f3e5a2631b402ec9ca75ad247ce281245
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  • File Type:
    Filetype[PDF - 17.91 MB ]
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