Wind and Structures

  • 제22권1호
  • /
  • Pages.65-87
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  • 2016
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Capacity of a transmission tower under downburst wind loading

  • Mara, T.G. (The Boundary Layer Wind Tunnel Laboratory, University of Western Ontario) ;
  • Hong, H.P. (Department of Civil and Environmental Engineering, University of Western Ontario) ;
  • Lee, C.S. (Department of Civil and Environmental Engineering, University of Western Ontario) ;
  • Ho, T.C.E. (The Boundary Layer Wind Tunnel Laboratory, University of Western Ontario)
  • 투고 : 2014.12.13
  • 심사 : 2015.10.22
  • 발행 : 2016.01.25
⟨ 이전 논문 다음 논문 ⟩

초록

The wind velocity profile over the height of a structure in high intensity wind (HIW) events, such as downbursts, differs from that associated with atmospheric boundary layer (ABL) winds. Current design codes for lattice transmission structures contain only limited advice on the treatment of HIW effects, and structural design is carried out using wind load profiles and response factors derived for ABL winds. The present study assesses the load-deformation curve (capacity curve) of a transmission tower under modeled downburst wind loading, and compares it with that obtained for an ABL wind loading profile. The analysis considers nonlinear inelastic response under simulated downburst wind fields. The capacity curve is represented using the relationship between the base shear and the maximum tip displacement. The results indicate that the capacity curve remains relatively consistent between different downburst scenarios and an ABL loading profile. The use of the capacity curve avoids the difficulty associated with defining a reference wind speed and corresponding wind profile that are adequate and applicable for downburst and ABL winds, thereby allowing a direct comparison of response under synoptic and downburst events. Uncertainty propagation analysis is carried out to evaluate the tower capacity by considering the uncertainty in material properties and geometric variables. The results indicated the coefficient of variation of the tower capacity is small compared to those associated with extreme wind speeds.

키워드

과제정보

연구 과제 주관 기관 : National Sciences and Engineering Research Council of Canada (NSERC)

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  4. New Perspective on Application of First-Order Reliability Method for Estimating System Reliability vol.143, pp.9, 2017, https://doi.org/10.1061/(ASCE)EM.1943-7889.0001280
  5. Reliability of Tower and Tower-Line Systems under Spatiotemporally Varying Wind or Earthquake Loads vol.143, pp.10, 2017, https://doi.org/10.1061/(ASCE)ST.1943-541X.0001835
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  8. Condition Assessment of Tower and Mast Structures Monitored within One Cluster under Changing Environments vol.2020, pp.None, 2016, https://doi.org/10.1155/2020/8820104
  9. Thunderstorm Downbursts and Wind Loading of Structures: Progress and Prospect vol.6, pp.None, 2020, https://doi.org/10.3389/fbuil.2020.00063