4.5 Article

Experimental Investigation of the Seismic Performance of Rectangular Reinforced Concrete Columns Subjected to Combined Flexure-torsion Cyclic Loading

Journal

JOURNAL OF EARTHQUAKE ENGINEERING
Volume 26, Issue 8, Pages 3954-3976

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/13632469.2020.1822225

Keywords

Experimental study; rectangular reinforced concrete column; combined loading; flexural capacity; torsion; ductility capacity

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This study investigates the seismic behavior of rectangular reinforced concrete columns under pure flexure, pure torsion, and combined flexural-torsional loadings. The results show that under combined loading, the displacement capacity and moment capacity of the specimens decrease, compared to the pure-flexural case. An equation expressing the interaction between flexural and torsional moment strength capacity is proposed.
This paper investigates the seismic behavior of the rectangular-reinforced concrete columns subjected to pure flexure, pure torsion, and combined flexural-torsional loadings using 4 quarter-scaled experimental specimens. During flexural-torsional loading, the axial rotation to the relative displacement ratios were considered to be 2 and 4. The ultimate displacement capacity and the flexural moment capacities of the specimens under combined flexural-torsional loadings were found to be decreased compared to the pure-flexural case for different rotation over drift ratios. An equation expressing the interaction curve between the flexural and torsional moment strength capacity of rectangular-reinforced concrete sections is proposed.

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