Retrofit of Rectangular Bridge Columns Using CFRP Wrapping





INTRODUCTION

INTRODUCTION AND BACKGROUND

The 1971 San Fernando earthquake and other more recent earthquakes have

demonstrated that bridges built according to older codes may be vulnerable to damage

under seismic loading. Many of the interstate bridges in the United States were

constructed in the 1950s and 1960s and incorporate deficiencies that must be addressed in

order to avoid major damage or even collapse under a strong ground motion.

Common deficiencies found in bridge columns built prior to 1971 are insufficient

transverse reinforcement and inadequate lap splice length. In addition, poor detailing

including poor anchorage of the transverse reinforcement, rare use of ties, and lap splices

located in potential flexural hinge regions make older columns susceptible to failure.

Possible failure modes of deficient columns are shear failure, pre-mature flexural failure

and lap splice failure.


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