BEHAVIOR OF REINFORCED CONCRETE BUILDINGS SUBJECTED TO MANY CYCLIC LOADINGS

In recent earthquakes, the number of cyclic loadings has exceeded that expected. Some experiments were conducted on reinforced concrete elements subjected to many cyclic loadings. The following observations are notable. 1) Slip-stiffness degradation occurs and the hysteretic shape tends to become reverse S-shaped. As a result, hysteretic energy decreases for every cyclic loading. 2) A directional point transfers to large deformation. A new hysteretic model was developed for reinforced concrete elements, which can be considered as slip-stiffness degradation and transference of directional point. Earthquake response analyses of reinforced concrete model buildings for long-period ground motion were conducted using the developed hysteretic model. The maximum response didn't increase greatly from that with the TAKEDA model.