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Planetary Boundary Layer Modeling and Standard Provisions for Supertall Building Design.

Emil Simiu1, N Alan Heckert2, DongHun Yeo3

  • 1NIST Fellow, Engineering Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899.

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PubMed
Summary
This summary is machine-generated.

Planetary boundary layer research shows wind speeds increase with height up to 1 km. This necessitates adjusting gradient height standards for designing supertall buildings to ensure safety.

Keywords:
Planetary boundary layer flowsStructural engineeringTall buildingsVeering angleWind effectsWind engineeringWind tunnel procedure

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Area of Science:

  • Atmospheric science
  • Structural engineering
  • Aerodynamics

Background:

  • Tall building design must account for high wind loads.
  • Planetary boundary layer research provides insights into wind behavior at height.
  • Current standards may not adequately address wind profiles for supertall structures.

Purpose of the Study:

  • To investigate wind speed profiles in the planetary boundary layer relevant to supertall building design.
  • To evaluate the adequacy of existing gradient height specifications in standards like ASCE 7.
  • To propose necessary adjustments for safe and accurate aerodynamic design.

Main Methods:

  • Analysis of recent planetary boundary layer research data.
  • Examination of wind speed trends with increasing elevation.
  • Comparative study of research findings against ASCE 7 gradient height specifications.

Main Results:

  • Longitudinal mean wind speeds monotonically increase with height up to at least 1 km.
  • This trend indicates a potential for unconservative designs under current standards.
  • Aerodynamic effects from neighboring buildings can exacerbate these issues for supertall structures.

Conclusions:

  • A derogation from ASCE 7 gradient height specifications is required for buildings exceeding 1 km.
  • Adjustments are crucial to prevent unconservative structural designs.
  • Accurate wind load assessment is vital for the safety of supertall buildings.