Abstract
High frequency component predominant ground motions were observed at Tsukidate, Miyagi during the 2011 Great East Japan Earthquake. The mechanism of seismic response and resistance of bridge column with rubber bearing supports which is concerned to resonate in high order vibration mode due to the high frequency component predominant ground motion was studied by the shaking table test using the quarter sized model. The result of this test showed that the reinforced concrete pier itself shaked in the high frequency, in the same way as the dynamic analysis. Meanwhile, the high frequency vibration of the reinforced concrete pier increased its shear strength by the strain rate effect and the deep beam effect. It was also estimated from the study of the shake table test results that the reinforced concrete bridge column with the flexural failure type was unlikely to be damaged, since the period of the motion became longer and the seismic response of the column was less likely to be amplified, if the column base section reached flexural-yielded by the vibration of the column itself.
