Life-Time Risk Assessment of Reinforced Concrete Highway Bridges Under Deterioration Processes

Reinforced concrete (RC) highway bridges are subjected to deteriorating mechanisms during their life-cycle. These mechanisms have adverse effects on the durability of bridges and can potentially make them vulnerable in terms of serviceability and ultimate limit states. Corrosion-induced deterioration can be identified in several forms, such as mass and strength loss of rebars, cracking and spalling of the concrete cover, and loss of bond between the concrete and steel. The structural degradation must be evaluated on a regular basis to determine the available structural capacity and schedule the required preventive actions. The current paper studies the extent and likelihood of deterioration of RC bridges located in chloride-contaminated environments and investigates the effects of chloride-induced corrosion on the life-time performance of the aging bridges. In this study, the corrosion initiation time is calculated through a detailed computational model considering the most influential parameters, including ambient temperature, relative humidity, chloride binding capacity, and exposure conditions. Also, a detailed mechanical model is provided to consider the effects of corrosion on decreasing the cross-sectional area of steel, yield strength of steel and the loss of the concrete cover.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 1014-1024
  • Monograph Title: Structures Congress 2014

Subject/Index Terms

Filing Info

  • Accession Number: 01522575
  • Record Type: Publication
  • ISBN: 9780784413357
  • Files: TRIS, ASCE
  • Created Date: Apr 9 2014 3:01PM