Abstract:To investigate the seismic behavior of steel tube reinforced concrete (STRC) bridge column, eight square column specimens with a shear span ratio of 3.0 were tested under simulated seismic loading conditions.Based on the observed failure patterns and the obtained force-displacement hysteretic curves, the effectiveness of core steel tube in improving the seismic resistance of reinforced concrete (RC) bridge column is evaluated.In addition, the effects of axial load ratio, stirrup ratio, longitudinal steel ratio, and core steel tube embedment length on the seismic behavior of STRC bridge column are also examined.Test results demonstrate that accompany by eliminating the combined failure mode of vertical crushing and flexural-shear in the RC counterpart, incorporating a core steel tube in the column can enhance the column lateral strength, deformability, energy dissipation, and self-centering capacity.Despite a larger lateral strength and a higher energy dissipation, the STRC column that sustained a higher axial load ratio exhibited relatively poor ductility and self-centering capacity.With the increase of stirrup ratio or longitudinal steel ratio, the hysteretic curvesof STRC bridge column became plumper, and the deformability and energy dissipation capacity were also improved.Core steel tube embedment length is of an essential structural parameter in determining the failure mode and therefore the seismic behavior of STRC bridgecolumn, as thisvariable increased, each seismic performance index of STRC bridge column was significantlyimproved because of the change of failure mode from brittle shear to ductile flexure.
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