Author(s)

Sven E. Thomasen

Abstract

In the first half of this century many significant concrete bridges were built in California. Preservation of these historic structures has become a challenge. The bridge elements are often severely deteriorated after years of environmental exposure and minimal maintenance, and the archaic materials are below the strength of modern materials. Federal and State funding for preservation of these historic bridges automatically triggers a requirement for traffic load upgrading and for seismic retrofit. The bridges have to be brought up to modem standards while maintaining the distinguishing original quality of the structure and respecting the integrity of the original designer's structural concept. Interventions necessitated by the strengthening must be designed to maintain the h

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