An integrated damping and strengthening strategy for performance-based seismic design and retrofit for highway bridges.

Details

• Creators:
  Karim, Kazi Rezaul
• Corporate Creators:
  Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
• Subject/TRT Terms:
  • Bridges
  • Earthquake resistant design
  • Reinforced concrete bridges
  • Fiber reinforced plastics
  • Bridges--Maintenance and repair
  • Seismic waves--Damping
  • Earthquake engineering--Materials
  • Reinforced concrete construction
  • Fiber-reinforced plastics
• Publication/ Report Number:
  NUTC R165
• Resource Type:
  Tech Report
• Geographical Coverage:
  Missouri
• Edition:
  Final.
• Corporate Publisher:
  Missouri University of Science and Technology. Center for Transportation Infrastructure and Safety
• Abstract:
  In this study, a damping-enhanced strengthening (DES) strategy was introduced to retrofit bridge structures for multiple ; performance objectives. The main objectives of this study are (1) to numerically demonstrate the effectiveness of the anchoring ; mechanism of a constrained damping layer in the proposed DES system, and (2) to evaluate the performances of a highway bridge ; retrofitted with a DES retrofit technique of viscoelastic (VE) damping and carbon-fiber-reinforced-polymer (CFRP) strengthening ; components that are nearly independent under weak earthquakes but strongly coupled under strong earthquakes. The effects of ; various constrained surface damping layers on the responses of simply-supported beams and cantilevered columns were first ; investigated analytically. An emphasis was then placed on the development of a finite element modeling technique to simulate the ; effect of a distributed VE damping layer on the responses of columns. Finally, the DES strategy was applied to retrofit the Old St. ; Francis River Bridge columns. Both operational and safety performance objectives of the bridges were evaluated with pushover ; analyses under earthquakes of various magnitudes. An anchored constrained damping layer was found several times more ; effective than a conventional constrained layer, particularly when covering 20-80% of the column height. To meet the two ; performance objectives, the Old St. Francis River Bridge columns must be wrapped with three plies of CFRP sheets and one VE ; layer. The new retrofit strategy is well suited in the context of next-generation performance-based seismic design and retrofit of ; highway bridges and other structures.
  More +
• Format:
  PDF
• Funding:
  DTRS98-G-0021
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/17147/dot_17147_DS1.pdf
• File Type:
  [PDF - 1.03 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:cc8d708589df86a140e30aea8466f2e02f6e93287d5cf43a5cb233e60d2ffe07