Fundamental study of functionality evaluation of base-isolated buildings under vertical motions

• Project/Area Number: 24860010
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Building structures/materials
• Research Institution: Tohoku University
• Principal Investigator: FURUKAWA Sachi 東北大学, 工学(系)研究科(研究院), 助教 (30636428)
• Project Period (FY): 2012-08-31 – 2014-03-31
• Project Status: Completed (Fiscal Year 2013)
• Budget Amount: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000); Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 免震 / 鉛直動 / 機能保持性能 / 床振動 / 機能保持 / 鉛直応答 / 常時微動計測

Research Abstract

According to results of collecting on-site records, full-scale shaking table tests and analytical simulation of base-isolated buildings, the followings are found to be major conclusions: (1) According to on-site records, the vertical floor acceleration amplification may exceed 6. (2) According to on-site records, major amplification in the vertical direction of base-isolated buildings is due to a superstructure rather than a base isolation layer. (3) The trend of the vertical dynamic response characteristics of base-isolated buildings can be represented by the combinations of the natural frequencies of the base isolation layer, the columns and the slab. (4) The vertical floor response becomes larger for the low-rise buildings when the natural frequencies of the slab and the base isolation layer are close to each other. On the other hand, the vertical floor response becomes larger for the mid-to-high-rise buildings when the natural frequency of the slab is the smallest among three.

Research Products

• [Presentation] 46棟の観測記録に基づく免震建物の鉛直床加速度応答特性の把握 (2014)
  • Author(s): 古川幸
  • Organizer: 日本建築学会東北支部研究報告会
  • Place of Presentation: 福島
• [Presentation] Contribution of Base Isolation Response of Base-isolated buildings (2014)
  • Author(s): S. Furukawa and E. Sato
  • Organizer: 1^<st> Huixian International Forum on Earthquake Engineering for Young Researchers
  • Place of Presentation: Harbin, China
• [Presentation] Comparison of Vertical Dynamic Response Characteristics of Two Base-isolated Buildings based on Full-scale Shaking Table Test (2013)
  • Author(s): Furukawa, S., Sasaki, T., Sato, E., Okazaki, T. and Ryan, K. L.
  • Organizer: 13^<th> World Conference on Seismic Isolation, Energy Dissipation and Active Vibration Control of Structures
  • Place of Presentation: Sendai, Japan (Paper No. 865233)
• [Presentation] ４６棟の観測記録に基づく免震建物の鉛直床加速度応答特性の把握
  • Author(s): 古川 幸
  • Organizer: 日本建築学会東北支部研究報告会
  • Place of Presentation: 福島県郡山市