Repair of Earthquake-damaged Bridge Columns with Fractured Bars

Past effort in seismic design of concrete bridges has been on detailing of bridges to prevent collapse. Reinforced concrete bridge columns are designed to undergo cracking, spalling, and yielding of steel and provide significant rotational capacity at plastic hinges so that the integrity of the overall structure is maintained. With proper design and construction this objective can be met. However, the serviceability of the bridge after the earthquake is in question. The level of damage to different columns of a bridge varies depending on the intensity of the ground shaking, type of earthquake, and the force/deformation demand on individual members. Based on the inspection of the damaged columns engineers have to determine whether the bridge is sufficiently safe to be kept open to traffic. They should also recommend repair methods for the columns. Any delay in opening of the bridge to traffic can have severe consequences on the passage of emergency vehicles, detour lengths, and traffic congestion in the area. Rapid and effective repair methods are needed to enable quick opening of the bridge to minimize impact on the community. This project includes the repair of fractured bars in a series of interlocking spiral bridge column models that were tested to failure as part of a separate study funded by the National Science Foundation at Missouri S&T. This project is a new collaboration between the University of Nevada, Reno (UNR), Missouri S&T, and the University of Houston. Work performed by Missouri S&T and the University of Houston is being performed as a subcontract to UNR's contract with Caltrans. The work performed in this project is an extension of a project by UNR (Caltrans Contract No. 59A0543), which is aimed at developing guidelines for reliable and efficient reinforced concrete repair methods using fiber reinforced polymers (FRP). This project extends the work to the repair columns of with fractured bars.

Language

  • English

Project

  • Status: Completed
  • Funding: $13281.00
  • Contract Numbers:

    DTRT06-G-0014

    00039918

  • Sponsor Organizations:

    Missouri University of Science and Technology, Rolla

    328 Butler-Carlton Hall
    1401 N. Pine Street
    Rolla, MO  United States  65401
  • Principal Investigators:

    Sneed, Lesley

  • Start Date: 20120801
  • Expected Completion Date: 0
  • Actual Completion Date: 20130531
  • Source Data: RiP Project 33597

Subject/Index Terms

Filing Info

  • Accession Number: 01489335
  • Record Type: Research project
  • Source Agency: Center for Infrastructure Engineering Studies
  • Contract Numbers: DTRT06-G-0014, 00039918
  • Files: UTC, RiP
  • Created Date: Aug 7 2013 1:01AM