Experimental and Analytical Investigation On Confined Reinforced Concrete Column
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Date
2010-10
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Addis Ababa University
Abstract
The intensity and frequency of earthquake are getting higher and higher during these few
years. After different failure observed the importance of enhancing the ductility capacity
became essential. The enhancement of strength and ductility in column requires
confinement of concrete by transverse reinforcement or other mechanism. In this study,
an experimental investigation was conducted to examine the effect of confinement in
concrete columns subjected to axial loading. The experimental program include 33 small
scale concrete column with 3 type of different geometric arrangement of transverse tie
(cross tie, normal and overlapping) of square column and three different number of layer
of square and circular column. For each experiment, stress–strain relationship was
obtained and compared with models proposed earlier.
The test result indicate that the strength of column confined by cross tie, over lapping
three layers square and circular specimens confined by wire mesh shows enhancement in
strength very significantly. Significant enhancement in peak strain and ductility was
observed in specimens confined by wire mesh and cross tie configuration especially
specimen having circular cross section confined by three layer wire mesh. Circular and
cross tie type of confinement preserve the strength in the descending region of the stressstrain
curve and prevent the column from sudden failure after peak load. From all
specimens the test result indicates that the cross ties configuration give higher strength
and ductility.
From this research due to their higher strength and ductility, in seismic region it is
recommended to use that the cross tie configuration and wire mesh with number of layer
is more than two. However, due to size and capacity limitation of the machine stressstrain
characteristics of experiment results in comparison with of the existing
confinement model show considerable deviation in the post strength zones. A better
achievement can be obtained by considering actual size of specimens.
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Keywords
Analytical; Investigation