This paper presents the preliminary results of an experimental investigation done by Takeuti about the structural behavior of reinforced concrete columns strengthened with high-performance concrete jackets. The experimental work consisted of three series of tests, each one involving two models: a basic reinforced concrete column, made of ordinary strength concrete, which represents the column to be strengthened, and an identical basic column strengthened by a high-performance concrete jacket. The columns were subjected to monotonic axial compression by means of a servo-controlled hydraulic machine (linearly controlled displacement test). Several calculation hypotheses were tested to evaluate the ultimate strength, confinement mechanisms and ductility of the columns.
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