Abstract
A series of cyclic and hybrid loading tests was conducted to clarify the effect of loading hystereses on the flexural strength and ductility capacities of circular reinforced concrete columns. In the cyclic loading test, 5 reinforced concrete columns with a diameter of 400mm were unilaterally loaded under a constant vertical force. A stepwise increase and a stepwise decrease loading scheme were used in the cyclic loading tests. It was found that the flexural strength at the same lateral displacement in the first push direction is about 10% larger in the stepwise decrease loading than the stepwise increase loading. The hystereses of the hybrid loading tests are closer to the hystereses of the stepwise decrease loading. It was also found that the Takeda degrading model does not provide a good numerical simulation for the hybrid loading tests when residual drift occurs.
