### Wind effect - Structural Design

**1**Wind force, shear, and overturn moment per level

Fx = wind force = wind pressure times tributary area per level exposed to wind

VX = shear per level = sum of Fx above

Mx = overturn moment = sum of all forces above times their distance above level x.

**2**Overturn effect

**3**Windward pressure increase with height

**4**Wind force

Fx = (windward pressure + leeward suction) times tributary area per level

(leeward wind suction is assumed constant for full height)

Fx = P A

P = wind pressure and suction in psf (Pa)

A = tributary area exposed to wind

(tributary area = building width times half the story height above and below)

**5**Shear

Wind shear per level = sum of all wind forces above

Wind shear is the integration of wind forces above

**6**Overturn moment

Overturn moment per level = sum of all forces above times their distance

Overturn moment per level = integration of shear diagram above respective level

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