A novel methodology for quantifying the performance of constructed bridges in cold regions.

Details

• Creators:
  Kim, Yail Jimmy
• Corporate Creators:
  University of Colorado at Denver. Dept. of Civil Engineering
• Corporate Contributors:
  United States. Dept. of Transportation. Research and Innovative Technology Administration ; North Dakota State University
• Subject/TRT Terms:
  • Methodology
  • Frigid regions
  • Cold weather
  • Bridge members
  • Concrete
  • Fiber reinforced polymers
  • Carbon fibers
  • Bridge decks
  • Statistical analysis
  • Finite element method
  More +
• Publication/ Report Number:
  MPC 14-266
• Resource Type:
  Tech Report
• Geographical Coverage:
  North Dakota
• Corporate Publisher:
  Mountain Plains Consortium
• Abstract:
  This report presents a two-part research program examining the performance of constructed bridges in a ; cold region, represented by those in the State of North Dakota, and the behavior of concrete members ; strengthened with carbon fiber reinforced polymer (CFRP) composite sheets in such a service condition. ; For the first phase, a total of 1,328 decks are sampled from a 15-year inspection period. These data are ; statistically characterized and probabilistically analyzed. The importance of timely technical action is ; discussed to enhance the condition rating of the bridge decks. The stochastic response of the existing ; decks is effectively represented by Gaussian probability distributions, regardless of inspection years. The ; performance of the decks tends to converge to a certain state with time. The state-transition of the in-situ ; decks is identified through the global health index proposed. The second part of the research concerns ; predictive investigations into the axial behavior of concrete exposed to aggressive service environments. ; Two types of concrete cylinders are studied: unconfined and confined with CFRP sheets. The aggressive ; environment and service traffic load are represented by freeze-wet-dry cycles with various levels of ; instantaneous compression load varying from 0% to 60% of the capacities of the unconfined and confined ; control concrete. Research approaches include three-dimensional deterministic finite element and ; probabilistic models, associated with a previously conducted experimental program. The effect of the ; instantaneous live load is significant on the performance of the unconfined and confined concrete, ; including the variation of compliance and volumetric characteristics. The efficacy of CFRP-confinement ; increases when the intensity of the live load increases. Reliability performance of the confined concrete is ; influenced by the environmental and physical conditioning. Refined design recommendations such as ; strength reduction factors are proposed to address the detrimental contribution of the environmental and ; physical attributes to the performance of CFRP-confined concrete, based on a Monte Carlo simulation ; that can cover over 95% of all possible cases in a normal probability distribution of the confined concrete
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27259/dot_27259_DS1.pdf
• File Type:
  [PDF - 2.08 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:5bdc13278393a5b840a65999def592b8533af6d608a25aa260cac6060f62d684