Title: Steel Jacket Retrofitting of Reinforced Concrete Bridge Columns for Enhanced Shear Strength-Part 1: Theoretical Considerations and Test Design

Author(s): M. J. Nigel Priestley, Frieder Seible, Yan Xiao, and Ravindra Verma

Publication: Structural Journal

Volume: 91

Issue: 4

Appears on pages(s): 394-405

Keywords: bridges (structures); columns (supports); ductility; earth-quake- resistant structures; flexural strength; reinforced concrete; shear strength.

DOI: 10.14359/9885

Date: 7/1/1994

Abstract:
A theoretical and experimental investigation conducted to study the shear failure mode of reinforced concrete bridge columns designed before 1971, and to establish the effectiveness of full-height steel jackets for enhancing the seismic shear strength, is described. In this first part of a two-part paper; theoretical considerations relating to assessing the shear strength of existing columns of circular or rectangular sections are presented. Current design approaches are compared with more recently developed, and less conservative, predictive methods. Models are presented for predicting the enhancement to shear strength provided by circular or elliptical (for rectangular section) jackets. Design details of an experimental test program to determine as-built and retrofitted column shear strength are presented.