RETROFITTING OF REINFORCED CONCRETE BRIDGES

Abstract

Bridges are important links in our surface transpor-tation net work, because they provide the means for over cross-ing both man made and natural obstacles. It is crucial that they continue to function in this vital role following an earthquake, when protection of lives and properties depends on the efficient movement of emergency traffic. This requires that bridges maintain both structural integrity and accessi-bility. Experience gained in the past earthquakes indicates that bridges are quite susceptible to failure during earthquakes. Many Bridges were not designed in accordance with the recent aseismic design procedure. Seismic retrofitting of existing bridges is one method of mitigating the risk that currently exists.. The goals and economics of retrofitting, however differ from those of new construction. The most important bridges and those that are highly vulnerable to seismic damage will be the most likely candidates for seismic retrofitting.