Seismic Design of Circular Concrete Filled Tube Bridge Pier Connections for Accelerated Bridge Construction

Concrete-filled tubes (CFT) offer an efficient and economical alternative to conventional reinforced concrete construction; however, their implementation in the United States (US) has been limited mainly due to uncertain design expressions and reliable connections. A research program was undertaken at the University of Washington to develop connection details to use CFT columns in bridge systems. Two types of connections are being investigated, including column-to-foundation and integrated column-to-cap beam connections. Two variations of an embedded CFT-to-foundation connection were experimentally evaluated in which the steel tube was embedded in surrounding concrete. Results from the experimental studies were used to develop engineering expressions for design of the CFT column-to-foundation connection. The second phase of the study focuses on the column-to-cap beam connection which offers many unique design constraints including congested joint reinforcing and limits on geometry. Two variations of the CFT column-to-cap beam connection are being numerically and experimentally evaluated: (1) an embedded connection similar to the proposed foundation connection and (2) a connection in which headed reinforcing bars are welded to the inside of the steel tube and extended into the cap beam. Preliminary numerical and experimental results indicate that the embedded connection can achieve strength and ductility requirements within the constraints of the cap beam.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 711-722
  • Monograph Title: Structures Congress 2014

Subject/Index Terms

Filing Info

  • Accession Number: 01522413
  • Record Type: Publication
  • ISBN: 9780784413357
  • Files: TRIS, ASCE
  • Created Date: Apr 9 2014 3:01PM