Structural Engineering and Mechanics

  • 제66권5호
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  • Pages.637-648
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  • 2018
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Effects of foundation flexibility on seismic demands of asymmetric buildings subject to near-fault ground motions

  • 투고 : 2017.09.24
  • 심사 : 2018.03.15
  • 발행 : 2018.06.10
⟨ 이전 논문 다음 논문 ⟩

초록

When the centers of mass and stiffness of a building do not coincide, the structure experiences torsional responses. Such systems can consist of the underlying soil and the super-structure. The underlying soil may modify the earthquake input motion and change structural responses. Specific effects of the input motion shall also not be ignored. In this study, seismic demands of asymmetric buildings considering soil-structure interaction (SSI) under near-fault ground motions are evaluated. The building is modeled as an idealized single-story structure. The soil beneath the building is modeled by non-linear finite elements in the two states of loose and dense sands both compared with the fixed-base state. The infinite boundary conditions are modelled using viscous boundary elements. The effects of traditional and yield displacement-based (YDB) approaches of strength and stiffness distributions are considered on seismic demands. In the YDB approach, the stiffness considered in seismic design depends on the strength. The results show that the decrease in the base shear considering soft soil induced SSI when the YDB approach is assumed results only in the center of rigidity to control torsional responses. However, for fixed-base structures and those on dense soils both centers of strength and rigidity are controlling.

키워드

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피인용 문헌

  1. The Effect of Foundation Flexibility on Probabilistic Seismic Performance of Plan-Asymmetric Buildings with Different Strength Distributions vol.2020, pp.None, 2020, https://doi.org/10.1155/2020/5191508
  2. Near-Fault Ground Motion Influence on the Seismic Responses of a Structure with Viscous Dampers considering SSI Effect vol.2021, pp.None, 2018, https://doi.org/10.1155/2021/6649124
  3. The effect of pile cap stiffness on the seismic response of soil-pile-structure systems under near-fault ground motions vol.20, pp.1, 2018, https://doi.org/10.12989/eas.2021.20.1.087