Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Seismic Response of MDOF Structure with Shallow Foundation Using Winkler Model

Winkler Model을 적용한 얕은 기초 다자유도 구조물의 지진응답

  • Kim, Dong Kwan (Department of Architectural Engineering, Cheongju University) ;
  • Kim, Ho Soo (Department of Architectural Engineering, Cheongju University) ;
  • Min, Ji Hee (Department of Architectural Engineering, Cheongju University) ;
  • Park, Jin Young (Department of Architecture and Architectural Engineering, Seoul National University)
  • 김동관 (청주대학교 건축공학과) ;
  • 김호수 (청주대학교 건축공학과) ;
  • 민지희 (청주대학교 건축공학과) ;
  • 박진영 (서울대학교 건축학과)
  • Received : 2023.11.06
  • Accepted : 2024.01.15
  • Published : 2024.07.01
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Abstract

This study investigated the impact of soil-structure interaction on multi-degree-of-freedom structures using the shallow-foundation Winkler model, known as the BNWF model. The model's period was determined through eigenvalue analysis and compared to results obtained from FEMA's formula. Results indicated that considering the soil, the structure's period increased by up to 8.7% compared to the fixed-base model, aligning with FEMA's calculations. Furthermore, with adequate ground acceleration, roof displacement increased by 3.4% to 3.8%, while base shear decreased by 4% to 10%. However, roof displacement and base shear increased in some earthquake scenarios due to spectral shape effects in regions with extended structural periods. Foundation damping effects, determined through the foundation's moment-rotation history, grew with higher ground acceleration. This suggests that accounting for period elongation and foundation damping can enhance the seismic design of multi-degree-of-freedom structures.

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