Abstract
In existing design practices selection of circular or square column shape mostly depends upon architectural needs rather than structural behavior. The behavior of equivalent area (circular and square), high strength reinforced concrete columns is reported to be same under monotonic loading conditions but their behavior under fatigue loading is not well-established. This paper presents the comparison of high strength reinforced concrete circular and square equivalent area columns’ performance (load-deflection behavior) under fatigue loading. Columns were casted in four configurations: square and circular shapes and with and without shear stirrups. Experimental results showed that in case of columns without shear stirrups, the square column resisted 38% more loading cycles as compared to circular column while the maximum deflection was 78% more than the circular column. Similarly, in case of columns with shear stirrups, square shaped column resisted 55% more loading cycles with only 5% more maximum deflections as compared to circular column. The results show that the square columns might be considered more ductile as compared to circular columns under the application of cyclic loading conditions like wind forces or seismic forces. Therefore, it might be concluded that square columns should be recommended for highly seismic regions as compared to circular columns with equivalent area. Doi: 10.28991/cej-2021-03091639 Full Text: PDF
Highlights
Reinforced concrete is one of the most widely used construction material around the world
Equivalent area Square and circular columns were tested under flexuralcontrolled fatigue loading conditions
The comparison shows that square columns without shear stirrups are more ductile as compared to circular columns without shear stirrups under flexural-controlled conditions
Summary
Reinforced concrete is one of the most widely used construction material around the world. Similar investigations were carried out on the behavior of RC columns subjected to flexural and torsional stresses and the effects of confinement on performance of reinforced columns were reported [11,12,13,14]. Authors feel a need for comparison of fatigue life performance (under flexural controlled cyclic loading) of high strength concrete square and circular columns with equivalent area of cross section. A similar study was carried out by the authors to compare the load-deflection performance of equivalent area circular and square columns subjected to monotonic flexural and shear controlled loading. The specimens without shear stirrups were investigated to study the effect of cross-sectional shape and reinforcement location on the load-deflection behavior of columns. The research article has been formulated using three major sections i.e., the details of speciemns and experimental setup has been explained in experimental approach, the results and related discussion has been provided under results and discussions and the conclusions have been presented
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