Abstract
COMPRESSIVE RESPONSE OF THE PARTIAL STEEL JACKETED SUBSTANDARD PRELOADED RC COLUMNS: END CONFINEMENT BEHAVIOR
*Akter F. and Ekram M. S.
ABSTRACT
Strengthening of the substandard reinforced concrete (RC) columns is frequently required to improve their load carrying capacity and behavior to sustain under the service loads. This research presents an experimental investigation on the substandard RC columns using the partial steel jacket method under compressive axial loads until failure. In the study, Structural Steel angles and Strips were used as the partial steel jacketing strength enhancement solution. A low compressive strength of 15.2 MPa was used to represent the substandard RC columns. To obtain a more realistic prediction of load-carrying capacity enhancement, the test column was preloaded by applying 70% of the ultimate compressive strength before the installation of the jackets on them. The principle objective of this study is to explore the efficiency of the end confinement applied by fixing short height jackets at the ends of the column and effects of the preload on the end strengthened test columns. However, the experimental results of the strengthened columns were analyzed with respect to the unstrengthened column. Remarkable enhancement in the ultimate load carrying capacity of the strengthened column was obtained with this study. Finally, the experimental results were compared with respect to some analytical models available in the existing literature and a good agreement was found between the experiment results and capacity prediction models.
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