KDOT Column Expert: Shear Capacity of Circular Bridge Piers Confined with FRP Wrapping

The extreme event requirement as a limit state set by AASHTO LRFD makes it necessary to develop the actual capacity of concrete sections to accurately design them to withstand the extreme load events. For confined sections subjected to combined axial force and uniaxial bending moment, the actual ultimate flexural capacity is found using the earlier versions of KDOT Column Expert. Furthermore, it is necessary to evaluate the section capacity in shear by generating accurate shear-moment interaction diagrams for each level of axial force and comparing them to the available experimental results, which was also developed under a KTRAN project awarded four years ago. KDOT Column Expert has proven itself to be a useful tool for evaluating bridge piers under AASHTO extreme load flexural and shear events. However, the shear option of the program is currently limited to cases without FRP wrapping. A need presented itself with KDOT Bridge Design office when checking some of their Bridge Piers in 2015 that did not pass the shear check without FRP wrapping which required additional checks using FRP strengthening by wrapping. However, this was not possible to perform since the program is not currently equipped with this option. The nonlinear axial load-strain and uniaxial moment-curvature response of reinforced concrete circular sections combined with shear forces is very involved in the presence of FRP wrapping. It is important to note that accurate results are guaranteed when the axial load and bending moments are proportional since loading path dependence is avoided. Rasheed and Abd El Fattah have developed a framework for columns wrapped with FRP that imposes proportional axial force and uniaxial bending moment on circular sections and iterates to obtain the corresponding deformation parameters. However, this procedure needs to be extended to the general case of shear-moment-axial force interaction in the presence of FRP confinement.

    Project

    • Status: Active
    • Funding: $37,945.00
    • Sponsor Organizations:

      Kansas State University

      Department of Civil Engineering
      Manhattan, KS  United States  66506-5000
    • Project Managers:

      Jones, John

    • Performing Organizations:

      Kansas Department of Transportation

      Eisenhower State Office Building
      700 SW Harrison Street
      Topeka, KS  United States  66603-3754
    • Principal Investigators:

      Rasheed, Hayder

    • Start Date: 20170515
    • Expected Completion Date: 20180514
    • Actual Completion Date: 0

    Subject/Index Terms

    Filing Info

    • Accession Number: 01662447
    • Record Type: Research project
    • Source Agency: Kansas Department of Transportation
    • Files: RiP, STATEDOT
    • Created Date: Mar 8 2018 11:40AM