Title: Aspects of Seismic Evaluation and Retrofit of Canadian Bridges
Author(s): D. Mitchell
Publication: Symposium Paper
Appears on pages(s): 169-190
Keywords: bridges; codes; ductility; earthquake-resistant
structures; evaluation; reinforced concrete; retrofit
The approach for seismic evaluation and guidelines for seismic retrofit in the Canadian Highway Bridge Design code are presented. A number of common seismic deficiencies found in bridge structures are discussed. The reversed cyclic loading behavior of columns with lap splices at their bases, outrigger beam-column connections and columns with hinges at their bases are discussed. Methods suitable for retrofit of a number these deficiencies are described. The responses of these elements after these retrofit strategies had been carried out are also presented.