Abstract
Cantilever-type column specimens of precast shell concrete (PCa) and monolithic reinforced concrete (RC) were designed to simulate the hinge zone of the column. Specimens are subjected to the static uni-axial reversals and the static bi-axial circle path loading. The cover concrete spall off and the exposure of reinforcement started at extreme compressive strain of 2% and at a drift angle of 5/100 in the uni-axial loading and 2.5- 3.5/100 in the circle path loading for PCa specimens, and at 2.5-3.5/100 in the uni-axial loading and 1.5-2/100 in the circle path loading for RC specimens. The bi-axial loading gives more serious damage to the concrete columns than the uni-axial loading. This is interpreted by the high compressive strain distribution of the column section. Due to high strength concrete outer shell, PCa specimens show about 20% higher strength than RC specimens. The fiber model analysis can simulate the experimental results.
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