Evaluation of Effects of Fire on the I-465 Mainline Bridges : Volume II

Details

• Alternative Title:
  JTRP Technical Reports
• Creators:
  Bradt, Thomas G. ; Rankin, Brent ; Connor, Robert J. ; Varma, Amit H.
• Corporate Creators:
  Purdue University. Joint Transportation Research Program
• Corporate Contributors:
  Indiana Department of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Behavior Bridge Composite Action Controlled Load Tests Environmental Impacts Fatigue Fatigue (Mechanics) Fire Fires Girder Girders Load Tests Steel Steel Bridges

  More +
• Publication/ Report Number:
  FHWA/IN/JTRP-2012/13
• Resource Type:
  Tech Report
• Geographical Coverage:
  Indiana
• Edition:
  Final report.
• Corporate Publisher:
  Purdue University. Joint Transportation Research Program
• Abstract:
  Currently, when a bridge has been involved in a fire loading, DOT and inspectors are called to determine if the bridge is passable to
  
  traffic. Inspectors must close the bridge for an indefinite period of time to take material samples from the bridge and have them tested
  
  to find if the strength of the materials meets AASHTO specifications. This procedure can take time and severely impact the economy of
  
  surrounding municipalities due to bridge closure. When a bridge is visually distorted, the recommendations of what must be done to
  
  repair the bridge may be intuitive; but when no apparent deformations are visible, a way of inspecting the bridge should be uniform and
  
  easily performed. The implementation of the findings of this report and the included inspection guide will provide inspectors a general
  
  idea of the changes in material properties of the bridge steel, based on the visual appearance of the steel.
  
  A method of testing has been developed that allows researchers to take flange and web sections from a bridge girder and test them in
  
  real fire scenarios. The test setup allows researchers to examine the differences in outcomes due to a variety of paint coatings on the
  
  steel, thickness of steel, temperature and duration of fire exposure. After each different test, material properties may be determined
  
  and compared to virgin or unexposed steel and AASHTO specifications to see if the material properties have changed or if the material is
  
  below minimum standards. Each specific test is photographed at certain stages that would be seen at a bridge in the field after being
  
  involved in a fire. These photographs can then be compared to actual bridge damage and an estimate of surface temperature could be
  
  attained. The inspection guide would then give average values for the reduction or increase of tensile strength and toughness for a
  
  particular bridge.
  
  
• Format:
  PDF
• Funding:
  SPR-3474
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:404b815807de21ee94a49e0a2834d098dfbd13f1726890f2621d4fe529cd06c795fe4b0a8564e37b262be537e2a728ecde1ea85c960ad56d5af75755898c7654
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25242/dot_25242_DS1.pdf
• File Type:
  [PDF - 73.03 MB ]