Report No.: CCEER-00-4

Title: Dynamic Testing of Non-Prismatic reinforced Concrete Bridge Columns retrofitted with FRP Jackets

Authors: F. Martinovic, M. Saiidi, D. Sanders and F. Gordaninejad

Date: January 2000

Sponsoring Agency: Nevada Department of Transportation (NDOT)

Performing Organization:
Department of Civil Engineering/258
University of Nevada, Reno
Reno, NV 89557


This document presents the development and experimental validation of seismic retrofitting of non-prismatic (flared) reinforced concrete bridge columns. Fiber reinforced plastic (FRP) jacketing was installed on the non-prismatic columns to enhance the shear capacity and improve the seismic response of the columns. Two 0.3-scale columns, one encased with a glass fiber-epoxy and the other with a carbon fiber-epoxy fabrics were tested. A shake table was used to load the column with a strong motion accelerogram from the 1994 Northridge earthquake. The measured results were compared to those from testing of an as-built and steel jacketed specimen to evaluate the effectiveness of the retrofit methods. The FRP jacket design and installation methods, as well as shear capacity calculation are presented. The experimental data indicated that both FRP jackets significantly improved the shear capacity and ductility. The performance of the columns retrofitted with FRP was very similar to that of a steel jacketed column.