Experimental Investigation of the Seismic Retrofit of Square RC Columns with Longitudinal CFRP Bonded and Transverse AFRP Strips using Active and Passive Confinement

Recent earthquakes have revealed an urgent need for the development of retrofit techniques for the existing buildings and bridges that have been designed in accordance with old seismic codes in order to meet the requirements of current seismic design standards. The insufficient amount of transverse reinforcement renders RC columns ineffective at dissipating seismic energy and the inadequate ductility rapidly leads to failure. In this research, six half-scale square RC columns with shear span to depth ratio of 2.5 with poor transverse reinforcements are tested under cyclic and axial loads as control columns and retrofitted ones. Longitudinal CFRP bonded used to increase the strength and AFRP strips used as external transverse reinforcement to evaluate the benefits of active and passive confinement. Variables investigated include: the type of confinement (Active and Passive), and the amount of axial load. Tests results show that strength and ductility of columns improves significantly as a result of confining action and the active confinement advantages versus passive confinement are demonstrated.

• Corporate Authors:

  National Concrete Bridge Council

  Portland Cement Association, 5420 Old Orchard Road
  Skokie, IL  United States  60077-1083
• Authors:
  • Taleie, S Mehdizad
  • Moghaddam, H A
• Conference:
  • HPC: Build Fast, Build to Last. The 2006 Concrete Bridge Conference
  • Location: Reno NV, United States
  • Date: 2006-5-7 to 2006-5-10
• Publication Date: 2006

Language

• English

Media Info

• Media Type: CD-ROM
• Pagination: 1p
• Monograph Title: HPC: Build Fast, Build to Last

Subject/Index Terms

• TRT Terms: Axial loads; Bridge design; Columns; Confined concrete; Continuously reinforced concrete pavements; Ductility; Earthquake resistant design; Earthquakes; Reinforced concrete; Repeated loads; Retrofitting; Seismicity
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01036194
• Record Type: Publication
• Files: TRIS
• Created Date: Oct 27 2006 8:14AM