Abstract
In this paper, theoretical and experimental results of two as‐built circular reinforced concrete (RC) bridge columns and two columns retrofitted with steel jackets are presented. A constitutive model for concrete confined by a steel jacket is proposed. The proposed model is implemented into a sectional analysis to predict the lateral load‐deformation relationship of retrofitted columns. 2/5 scaled RC bridge columns are designed based on the standard details of the existing bridge columns mostly built in late 1980s and early 1990s, in Taiwan (Ministry of Transportation and Communication, 1987; 1995). The columns are expected to have a flexural failure mode during severe ground shaking. Displacement‐controlled cyclic loading tests were conducted to obtain the seismic performance of the columns. The experimental results showed that the bridge column retrofitted with steel jacketing could greatly improve seismic performance measured based by the strength and ductility. The analytical results showed that the proposed constitutive model, implementing sectional analysis, could well capture the lateral force‐displacement relationship of the bridge columns retrofitted with steel jackets.
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