2015 年 15 巻 3 号 p. 3_61-3_77
The modal properties of a three-story reinforced concrete building that was affected by the 2011 Tohoku Earthquake were revealed through acceleration records of the main shock and ambient vibration. Damaged stories were detected from identified natural modes from the records. In addition, we estimated the modal parameters using two types of frequency domain decomposition techniques: one for a general viscous damping system and the other for a proportional damping system. The influence of the viscous damping condition on the identified natural modes was discussed.
