Abstract
This research aims at getting the necessary basic data for the proposal of the hysteresis loop of RC members subjected to pure torsion. Pure torsion cyclic loading test was conducted by using the scale model of RC piers. The primary reinforcement and lateral reinforcement, concrete strength and axial forces were set up as parameters. The effect of these parameters on the second slope after yield, a negative slope after the maximum strength, and the ductility factor of torsion are clarfied. Moreover, it was stated that the proposal of the estimation method about the skeleton curve based on the experiment results, and it also was referred that the relations between the torsion rate and the torsion angle, and the characteristics of hysteresis loop.
