A PILOT STUDY OF FACTORS AFFECTING LIVE-LOAD DISTRIBUTION IN PRESTRESSED CONCRETE BEAM-SLAB BRIDGES

This is the fifth report on the research investigation entitled "Development and Refinement of Load Distribution Provisions for Prestressed Concrete Beam-Slab Bridges" (PennDOT 72-4). This report describes a very brief pilot study of the structural behavior of prestressed concrete beam-slab bridges, particularly live load distribution, as affected by (1) curb-parapet sections, (2) intra-span diaphragms, and (3) continuity over the supports in multi-span structures. For simple span bridges, it was found that consideration of the longitudinal strength and stiffness of the curb-parapet sections yields higher values of the live-load distribution factors for exterior beams and lower values for interior beams, when compared with distribution factors based on analyses which ignore the effects of the curb-parapet sections. The effect of intra- span diaphragms is to more evenly distribute the live load to the individual longitudinal beams. A diaphragm at midspan was found to be more effective than other combinations considered. For multi-span bridges constructed with longitudinal continuity over the supports, the live-load distribution was found to be similar to the distribution in simple span bridges of shorter span. (FHWA)

  • Corporate Authors:

    Lehigh University

    Fritz Engineering Laboratory
    Bethlehem, PA  United States  18015

    Pennsylvania Department of Transportation

    P.O. Box 2926
    Harrisburg, PA  United States  17120
  • Authors:
    • deCastro, E S
    • Kostem, C N
    • Van Horn, D A
  • Publication Date: 1979-8

Media Info

  • Pagination: 65 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00319778
  • Record Type: Publication
  • Source Agency: Federal Highway Administration
  • Report/Paper Numbers: FHWA-PA-RD-72-4-4 Intrm Rpt., FCP 45F3-622
  • Contract Numbers: 72-4
  • Files: TRIS, USDOT, STATEDOT
  • Created Date: Mar 12 1981 12:00AM