Seismic behavior of circular reinforced concrete bridge columns under combined loading including torsion.
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2009-12-01
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Edition:Final report.
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Abstract:Reinforced concrete (RC) columns of skewed and curved bridges with unequal spans and column heights can be subjected to
combined loading including axial, flexure, shear, and torsion loads during earthquakes. The combination of axial loads, shear
force, and flexural and torsional moments can result in complex failure modes of RC bridge columns. This study carried out
experimental and analytical studies to investigate the seismic performance of circular RC columns under combined loading
including torsion. The main variables considered here were (i) the ratio of torsion-to-bending moment (T/M), (ii) the ratio of
bending moment-to-shear (M/V) or shear span (H/D), and (iii) the level of detailing for high and moderate seismicity (high or low
spiral ratio). In particular, the effects of the spiral reinforcement ratio and shear span on strength and ductility of circular RC
columns under combined loading were addressed. In addition, the effects of torsional loading on the bending moment-curvature,
ductility, and energy dissipation characteristics were also considered. The analytical investigation examined the development of
existing models for flexure and pure torsion. Interaction diagrams between bending, shear and torsional loads were established
from a semi-empirical approach. A damage-based design approach for circular RC columns under combined loads was proposed
by decoupling damage index models for flexure and torsion. Experimental and analytical results showed that the progression of
damage was amplified by an increase in torsional moment. An increase in the transverse spiral reinforcement ratio delayed the
progression of damage and changed the torsional-dominated behavior to flexural-dominated behavior under combined flexural
and torsional moments.
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