Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Seismic Responses of Multi-DOF Structures with Shallow Foundation Using Centrifuge Test

원심모형실험을 활용한 얕은 기초가 있는 다자유도 구조물의 지진응답

  • Kim, Dong Kwan (Department of Architectural Engineering, Cheongju University) ;
  • Kim, Ho Soo (Department of Architectural Engineering, Cheongju University) ;
  • Kim, Jin Woo (Department of Architectural Engineering, Cheongju University)
  • 김동관 (청주대학교 건축공학과) ;
  • 김호수 (청주대학교 건축공학과) ;
  • 김진우 (청주대학교 건축공학과)
  • Received : 2022.01.26
  • Accepted : 2022.03.10
  • Published : 2022.05.01
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Abstract

In this study, centrifuge model tests were performed to evaluate the seismic response of multi-DOF structures with shallow foundations. Also, elastic time history analysis on the fixed-base model was performed and compared with the experimental results. As a result of the centrifuge model test, earthquake amplification at the fundamental vibration frequency of the soil (= 2.44 Hz) affected the third vibration mode frequency (= 2.50 Hz) of the long-period structure and the first vibration mode (= 2.27 Hz) of the short-period structure. The shallow foundation lengthened the periods of the structures by 14-20% compared to the fixed base condition. The response spectrum of acceleration measured at the shallow foundation was smaller than that of free-field motion due to the foundation damping effect. The ultimate moment capacity of the soil-foundation system limited the dynamic responses of the multi-DOF structures. Therefore, the considerations on period lengthening, foundation damping, and ultimate moment capacity of the soil-foundation system might improve the seismic design of the multi-DOF building structures.

Keywords

Acknowledgement

본 논문은 2020~2021년도 청주대학교 연구장학 지원에 의한 것임.

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