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:
  Bridge Decks Bridge Members Carbon Fibers Cold Weather Concrete Fiber Reinforced Polymers Finite Element Method Frigid Regions Inspection Methodology Statistical Analysis Traffic Loads

  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
  
  
• Format:
  PDF
• Collection(s):
  University Transportation Centers US Transportation Collection
• Main Document Checksum:
  urn:sha256:5bdc13278393a5b840a65999def592b8533af6d608a25aa260cac6060f62d684
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27259/dot_27259_DS1.pdf
• File Type:
  [PDF - 2.08 MB ]