333 実測データを用いた高層建物の地震時および常時微動時における減衰特性評価

• 徳永 至

  明治大学大学院理工学研究科

• 谷口 竜紀

  明治大学大学院理工学研究科 (現)織本構造設計

• 荒川 利治

  明治大学大学院理工学研究科

• 中村 尚弘

  (株)竹中工務店技術研究所

• 木下 拓也

  (株)竹中工務店技術研究所

• 東城 峻樹

  (株)竹中工務店技術研究所

書誌事項

タイトル別名

• 333 The Evaluation of Damping Characteristics for a High-rise Building during Earthquake and Microtremor based on Measurement data

抄録

This paper describes the evaluation of vibration characteristics for a high-rise building based on vibration measurement data. The purpose of this study is to accumulate results for the actual situation of vibration characteristics, such as natural frequency and damping ratio, during microtremor or earthquake. The object building is Academy Common belonging to Surugadai Campus of Meiji University located Tokyo metropolis in Japan. The building of 67.7m height is made of steel and concrete filled steel tube. The observation data of microtremor and earthquake are recorded by accelerometers attached to several floors of the building, ground surface and 30m under ground. Periodic microtremor measurement and earthquake observation are conducted more than 11 years. In microtremor, 1st mode to 2nd mode in two horizontal directions and torsional direction are targeted. We examine the changes along passages and the dispersions of natural frequency and damping ratio in microtremor from the viewpoint of structure health monitoring. In earthquake, 1st mode to 2nd mode in narrow direction are targeted. As for the earthquake data, vibration characteristics are estimated by the system identification using the ARX (Auto Regressive eXogenous) model. The estimated vibration characteristics are considered time history, relations between vibration amplitudes and those vibration characteristics. Natural frequencies reduce due to changes along passage and increase with vibration amplitude. Damping ratios are constant so far. 1st mode damping ratio is constant without depending on the vibration amplitude. However, the more vibration amplitudes increase, the more 2nd mode damping ratios increase.

収録刊行物

• 機械力学・計測制御講演論文集

  機械力学・計測制御講演論文集 2015 "333-1"-"333-10", 2015-08-25

  一般社団法人日本機械学会

キーワード

• High-rise Building
• Microtremor
• Earthquake Observation
• Natural Frequency
• Damping Ratio
• Vibration Amplitude

詳細情報

• CRID: 1570009752576205952
• NII論文ID: 110010051868
• NII書誌ID: AA11901770
• ISSN: 13480235
• 本文言語コード: ja
• データソース種別:
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