Seismic Performance of Confined Concrete Bridge Columns

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Title: Seismic Performance of Confined Concrete Bridge Columns

Author(s): J.P. Moehle and D.E. Lehman

Publication: Special Publication

Volume: 238

Issue:

Appears on pages(s): 23-42

Keywords: bridges; columns; confined concrete; earthquake engineering; performance-based earthquake engineering; reinforced concrete

Date: 10/1/2006

Abstract:
A current focus in earthquake engineering research and practice is the development of seismic design procedures whose aim is to achieve a specified performance. To implement such procedures, engineers require methods to define damage in terms of engineering criteria. Previous experimental research on bridge columns has focused on component failure, with relatively little attention to other damage states. A research program was undertaken to assess the seismic performance of well-confined, circular-cross-section, reinforced concrete bridge columns at a range of damage states. The test variables included aspect ratio, longitudinal reinforcement ratio, spiral reinforcement ratio, axial load ratio, and the length of the well-confined region adjacent to the zone where plastic hinging is anticipated. The experimental results are used to identify important damage states and to link those states to engineering parameters.