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Seattle Space Needle: 184 m Tripod Tower & Flying Saucer Halo
6 curved tubular steel legs, pinch waist profile, central elevator core, 42 m flying saucer halo, and aircraft spire.
Verify lateral deflection and modal vibration frequencies of the slender waist under hurricane-force wind loads, ensuring cantilever brackets supporting the heavy revolving restaurant halo maintain structural integrity.
1. Geometry & FEA Mesh
- •6 curved tubular steel legs arranged in 3 symmetric pairs, curving from base radius R = 22 m to waist R = 7.5 m (at z = 110 m) and expanding to R = 10.5 m (at z = 150 m)
- •Central triangular steel lattice elevator core tied to the legs by 4 levels of horizontal belt trusses (z = 35, 70, 105, 140 m)
- •Cantilevered 5-storey flying saucer halo (diameter D = 42 m) at z = 150 to 164 m with radial truss outriggers
- •Top observation spire and aircraft beacon mast rising from z = 164 m to 184 m
2. Loads & Boundary Conditions
- •Fixed anchor supports at the 6 leg foundation bases at ground z = 0
- •Self-weight gravity with heavy restaurant deck and machinery loads
- •Pacific Northwest gale wind pressure along +X acting on legs, core, and 42 m saucer disk
3. Simulation Results & Findings
- ✓Tripod curved leg geometry creates exceptional lateral stiffness with low sway amplitude
- ✓Fundamental sway mode f₁ reflects well-balanced mass and stiffness distribution
- ✓Buckling analysis validates stability of the curved compression legs against lateral-torsional buckling
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