ASCE Wind Loads SESSION 1-2 Wind Engineering Theory: Bluff Body Aerodynamics.

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Presentation transcript:

ASCE Wind Loads SESSION 1-2 Wind Engineering Theory: Bluff Body Aerodynamics

ASCE Wind Loads Introduction Buffeting - Forced vibration from upwind turbulent winds (Note - I say vibrations for a stiff or flexible structure) Vortex Induced Motion - Forced vibration from regular turbulence in wake (downwind) Aeroelastic Vibrations - Vibrations caused by motion dependent aerodynamic loads

ASCE Wind Loads Bernoulli's Equation Along a streamline

ASCE Wind Loads

BERNOULLI'S EQUATION NB ~UNLESS NOTED, ALL PRESSURES ARE SUCTIONS (NEG) ALL PRESSURES ARE DYNAMIC, i.e., p(t)

ASCE Wind Loads PRESSURE COEFFICIENTS NB ~PRESSURES ARE A FUNCTION OF THE BUILDING SHAPE AND THE WIND SPEED. PRESSURE COEFFICIENTS ARE A FUNCTION OF THE SHAPE ALONE.

ASCE Wind Loads PRESSURE COEFFICIENTS

ASCE Wind Loads Video of Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Cladding Pressures Courtesy of Joe Minor, Consulting Engineer

ASCE Wind Loads Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Cladding Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Internal Pressures Courtesy of Joe Minor, Consulting Engineer

ASCE Wind Loads Internal Pressures Courtesy of Joe Minor, Consulting Engineer

ASCE Wind Loads Internal Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Internal Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Internal Pressures Courtesy of Wind Science and Engineering, Texas Tech Univ.

ASCE Wind Loads Vortex Shedding

ASCE Wind Loads Wind tunnel: Vortex shedding

ASCE Wind Loads Aeroelastic Action

ASCE Wind Loads Aeroelastic Behavior Tacoma Narrows Bridge