DAMAGED STORY DETECTION AND MODAL PROPERTIES OF A RC BUILDING SUBJECTED TO 2011 TOHOKU EARTHQUAKE

Kahori IIYAMA; Satoshi KURITA; Masato MOTOSAKA; Kazuki CHIBA; Yuta SAKURADA; Kazuya MITSUJI

doi:10.5610/jaee.15.3_61

Technical Papers

DAMAGED STORY DETECTION AND MODAL PROPERTIES OF A RC BUILDING SUBJECTED TO 2011 TOHOKU EARTHQUAKE

Kahori IIYAMA, Satoshi KURITA, Masato MOTOSAKA, Kazuki CHIBA, Yuta SAKURADA, Kazuya MITSUJI

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Keywords: Microtremor measurement, Damage estimation, System identification, Frequency domain decomposition

JOURNAL FREE ACCESS

2015 Volume 15 Issue 3 Pages 3_61-3_77

DOI https://doi.org/10.5610/jaee.15.3_61

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Abstract

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.

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