Designing for Deck Stress over Precast Panels in Negative Moment Regions

One of the leading causes contributing to structural deficiency in the United States Bridge Inventory is related to deterioration and durability issues with concrete bridge decks (National Cooperative Highway Research Program (NCHRP), 2004). The primary factor that affects the durability of the concrete deck is cracking that provides a direct conduit for moisture and other corrosive agents to penetrate the concrete and attack the reinforcing steel. The area of the bridge where deck cracking is most predominant is in the negative moment region where the concrete is subjected to tensile stresses from girder flexure. One of the problems faced by designers is the lack of clear guidance in the American Association of State Highway and Transportation Officials Load and Resistance Factor Design (AASHTO LRFD) Specifications on the reinforcing requirements in the concrete deck. The vague AASHTO LRFD Commentary language for continuous steel girders as well as the lack of provisions for continuous prestressed concrete girders results in a complicated situation for engineers that creates overly-conservative or unconservative conditions depending on how an engineer interprets the specification and commentary. Center for Transportation Research (CTR) shall develop comprehensive guidelines for deck reinforcing steel details in the negative moment regions of bridges utilizing precast, prestressed concrete panels (PCPs). The primary focus is on continuous prestressed concrete girder systems, however; CTR shall develop improved guidance for continuous steel girder systems.

Language

  • English

Project

  • Status: Active
  • Funding: $994832
  • Contract Numbers:

    0-6909

  • Sponsor Organizations:

    Texas Department of Transportation

    125 E. 11th Street
    Austin, TX  United States  78701-2483
  • Project Managers:

    Adams, Joe

  • Performing Organizations:

    Center for Transportation Research

    University of Texas at Austin
    1616 Guadalupe, Suite 4.202
    Austin, Texas  United States  78701
  • Principal Investigators:

    Helwig, Todd

  • Start Date: 20151221
  • Expected Completion Date: 20191231
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01618976
  • Record Type: Research project
  • Source Agency: Texas Department of Transportation
  • Contract Numbers: 0-6909
  • Files: RiP, STATEDOT
  • Created Date: Dec 20 2016 4:27PM