Evaluation and Repair of Existing Bridges in Extreme Environments

Deterioration of the nation's bridge infrastructure is a significant problem. In general, deterioration can be attributed to two main factors, corrosion and metallic fatigue, which work together to reduce structural capacity over time. Many of the bridges currently in service are reaching the end of their design lives or have been labeled structurally deficient either due to deterioration or differences between past and current code requirements. With existing bridges subjected to intensifying environmental conditions and increasing freight truck traffic, deterioration rates will likely increase. The goal of the project is to produce comprehensive strategies for evaluation and resilient repair of prestressed concrete and steel bridge girders subjected to extreme environments in order to increase the longevity of existing structures. The project objectives aim to improve the resiliency of existing steel and concrete bridges subjected to aggressive environments in the southern plains region through identification of existing or imminent damage and design of targeted and efficient repairs. "Fatigue critical zones" will be identified using detailed finite element analysis. Prestressed carbon fiber reinforced polymer (CFRP) retrofit solutions focused on mitigating fatigue crack initiation will be developed for the critical zones using a finite element parametric study. Methods for optimizing these solutions to best shift the mean stress into a safe range for fatigue will be developed along with corrosion resistant application and bonding strategies. Concrete bridge issues will be examined through a series of tests on scaled prestressed concrete girders subjected to accelerated corrosion. These tests will identify how end zone corrosion affects member strength through concrete deterioration and loss of bond with the prestressing steel. The results will be utilized to assess levels of corrosion for evaluation and accurate residual strength for use in design of retrofits. The assessment of corrosion level will be used to develop a simplified classification system and preliminary rating procedure. Retrofit methods will be examined with a focus on CFRP and inclusion of residual strength. Structural tests will be conducted to determine the effectiveness of repairs and recommendations will be developed for appropriate retrofit methods. The results of the two distinct aspects of the project will be synthesized to produce comprehensive recommendations.

    Language

    • English

    Project

    • Status: Active
    • Funding: $317560.00
    • Contract Numbers:

      DTRT13-G-UTC36

      SPTC 14.1-58

    • Sponsor Organizations:

      University of Arkansas

      Department of Civil Engineering
      4190 Bell Engineering
      Fayetteville, AR  United States  72701

      Oklahoma Department of Transportation

      200 NE 21st Street
      Oklahoma City, OK  United States  73105

      Research and Innovative Technology Administration

      University Transportation Centers Program
      1200 New Jersey Avenue, SE
      Washington, DC  United States  20590
    • Performing Organizations:

      University of Arkansas

      Department of Civil Engineering
      4190 Bell Engineering
      Fayetteville, AR  United States  72701

      University of Oklahoma, Norman

      School of Civil Engineering and Environmental Science
      202 West Boyd Street, Room 334
      Norman, OK  United States  73019
    • Principal Investigators:

      Prinz, Gary

      Floyd, Royce

    • Start Date: 20140801
    • Expected Completion Date: 0
    • Actual Completion Date: 20160731
    • Source Data: RiP Project 37447

    Subject/Index Terms

    Filing Info

    • Accession Number: 01543045
    • Record Type: Research project
    • Source Agency: Southern Plains Transportation Center
    • Contract Numbers: DTRT13-G-UTC36, SPTC 14.1-58
    • Files: UTC, RiP
    • Created Date: Nov 4 2014 1:00AM