Seismic Retrofit of Existing Bridge Columns with Hinges


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Title: Seismic Retrofit of Existing Bridge Columns with Hinges

Author(s): A. Griezic, W. D. Cook, and D. Mitchell

Publication: Special Publication

Volume: 187


Appears on pages(s): 205-234

Keywords: columns (supports); concrete hinges; earthquake-resistant structures; retrofit; reversed cyclic loading; tests

Date: 6/1/1999

A series of five bridge columns with concrete hinges at their bases were tested under reversed cyclic loading to determine their behavior. A method for predicting the responses, which accounts for the effects of confinement on the concrete hinge region and yield penetration is presented. A simple retrofit technique for two-way hinges, using dry-pack grout, was investigated. A method for retrofitting one-way hinges by using an added reinforced concrete footing block, together with concrete in-fitted steel jacketing was tested. The reversed cyclic loading response, before and after retrofit are compared and means of both designing the retrofit and predicting the responses are presented.