Wind and Structures

  • 제36권4호
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  • Pages.221-236
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  • 2023
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Identification of acrosswind load effects on tall slender structures

  • Jae-Seung Hwang (School of Architecture, Chonnam National University) ;
  • Dae-Kun Kwon (NatHaz Modeling Laboratory, University of Notre Dame) ;
  • Jungtae Noh (Department of Architectural Engineering, Dankook University) ;
  • Ahsan Kareem (NatHaz Modeling Laboratory, University of Notre Dame)
  • 투고 : 2022.09.05
  • 심사 : 2023.04.02
  • 발행 : 2023.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

The lateral component of turbulence and the vortices shed in the wake of a structure result in introducing dynamic wind load in the acrosswind direction and the resulting level of motion is typically larger than the corresponding alongwind motion for a dynamically sensitive structure. The underlying source mechanisms of the acrosswind load may be classified into motion-induced, buffeting, and Strouhal components. This study proposes a frequency domain framework to decompose the overall load into these components based on output-only measurements from wind tunnel experiments or full-scale measurements. First, the total acrosswind load is identified based on measured acceleration response by solving the inverse problem using the Kalman filter technique. The decomposition of the combined load is then performed by modeling each load component in terms of a Bayesian filtering scheme. More specifically, the decomposition and the estimation of the model parameters are accomplished using the unscented Kalman filter in the frequency domain. An aeroelastic wind tunnel experiment involving a tall circular cylinder was carried out for the validation of the proposed framework. The contribution of each load component to the acrosswind response is assessed by re-analyzing the system with the decomposed components. Through comparison of the measured and the re-analyzed response, it is demonstrated that the proposed framework effectively decomposes the total acrosswind load into components and sheds light on the overall underlying mechanism of the acrosswind load and attendant structural response. The delineation of these load components and their subsequent modeling and control may become increasingly important as tall slender buildings of the prismatic cross-section that are highly sensitive to the acrosswind load effects are increasingly being built in major metropolises.

키워드

과제정보

This research was supported by a grant from the Technology Advancement Research Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government (grant 21CTAP-C164107-01). This work was also supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (2020R1F1A1070349) and by Brain Pool program funded by the Ministry of Science and ICT through the National Research Foundation of Korea (2021H1D3A2A0203968712) and in part the Robert M Moran Professorship endowment, University of Notre Dame.

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