Softening Behavior of RC Columns under Cyclic Loading

Abstract eng:
The load carrying capacity and energy dissipation behavior of columns in post yield range of deformation has a significant role to prevent a total collapse of reinforced concrete buildings. Reinforced concrete short (small height to depth ratio) column dominated by shear generally indicates the reduction of lateral load capacity and less energy dissipation due to pinching effect after peak load. Therefore the seismic design of RC short columns needs to consider not only the shear strength but also the post peak behavior in view of capacity reduction and energy dissipation during load cycling. However there are few researches on the post peak behavior of shear dominated short column. Ten RC columns with varying shear reinforcement ratios and axial force ratios were tested under reversed cyclic loading. Test results indicated that the nominal concrete contribution to shear resistance in the plastic hinge region decreased after flexural yielding of the column. In addition, the axial force decreased the deformability of RC members, but eliminated the pinching effect in the post-yield load hysteretic response.

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