Abstract
The behavior of slender concrete columns encased in a thin, flexible plastic pour-in form under increasing axial load was evaluated experimentally, by testing two groups of columns. Group one included seven unconfined concrete specimens and group two included nine steel-fibered concrete specimens with or without the plastic pour-in form. Different end-restraint conditions were used at the top and bottom ends of the columns. The main variables of the research included plastic tube geometry, slenderness ratios, steel fiber, and the rotation of the loading platen, and their effect on the ultimate strength and lateral deformations were investigated. Results show an increase in strength of 42% to 71% for specimens with pour-in form over plain concrete columns. The experimental results were compared with the calculated results showing good agreement.
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