Development of Low-Cost Multifunctional Materials for Near-Surface-Mounted (NSM) Strengthening of RC Bridge Beams and Columns

Due to their excellent passive re-centering and energy absorbing capabilities, superelastic shape memory alloys (SMAs) have been considered in the development of seismic protection systems. Among various SMA compositions, nickel-titanium (NiTi) alloys have been the most widely studied and commercially available material. Low-cost SMAs such as Cu-based or Fe-based SMAs have recently emerged as strong candidates to replace NiTi SMAs especially in the civil applications, primarily due to the need of larger scales and associated costs, and secondarily but equally importantly, their superior mechanical and shape memory properties, easy machinability and weldability. Specific Fe-based SMA compositions in particular, show intriguingly wide temperature ranges where superelasticity can be observed. These Fe-based SMA compositions also exhibits magnetic properties enabling the monitoring of stresses and strains on structural systems remotely using commercial magnetometers. Within this study, low-cost superelastic Fe-based and Cu-based SMA rods will be fabricated. Initial efforts will be towards the scale-up process of the rods, to enable their use as rebars in structural applications. These efforts will include specific thermomechanical processing and heat treatments to induce a unique microstructure that will result in the superelastic effect. The fabricated SMA bars will subsequently be used in the nearsurface-mounted (NSM) reinforcement of prototype reinforced concrete (RC) structural elements to investigate their effectiveness compared to other common reinforcement materials such as fiber-reinforced polymers. RC structures NSM strengthened via low-cost SMA will transform the design, construction, and rehabilitation of infrastructure systems.

• Record URL:
  https://transet.lsu.edu/research-in-progress/
• Supplemental Notes:
  • 19STTAM03

Language

• English

Project

• Status: Active
• Funding: $120000
• Contract Numbers:

  69A3551747106

• Sponsor Organizations:

  Office of the Assistant Secretary for Research and Technology

  University Transportation Centers Program
  Department of Transportation
  Washington, DC  United States  20590
• Managing Organizations:

  Transportation Consortium of South-Central States (Tran-SET)

  Louisiana State University
  Baton Rouge, LA  United States  70803
• Project Managers:

  Melson, Christopher

• Performing Organizations:

  Texas A&M University, College Station

  318 Jack K. Williams Administration Building
  College Station, TX  United States  77843
• Principal Investigators:

  Karaman, Ibrahim

  Can Atli, Kadri

• Start Date: 20190815
• Expected Completion Date: 20210215
• Actual Completion Date: 0
• USDOT Program: University Transportation Centers Program

Subject/Index Terms

• TRT Terms: Alloys; Bridges; Magnetic detectors; Retrofitting; Structural health monitoring
• Subject Areas: Bridges and other structures; Design; Materials;

Filing Info

• Accession Number: 01713241
• Record Type: Research project
• Source Agency: Transportation Consortium of South-Central States (Tran-SET)
• Contract Numbers: 69A3551747106
• Files: UTC, RIP
• Created Date: Aug 6 2019 2:21PM