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Burj Khalifa: 828 m Buttressed Core Megatall Skyscraper
Y-shaped tripod floor plan, central hexagonal core, 3 stepped buttress wings, outrigger belt trusses, and summit steel spire.
Verify global lateral drift, overturning resistance, and fundamental sway frequencies of the 828 m megatall tower under extreme Arabian Gulf boundary-layer wind velocity profiles, ensuring the spiral setback geometry effectively confuses vortex shedding.
1. Geometry & FEA Mesh
- •Y-shaped footprint with central hexagonal core tube and three 120° radiating wings extending to radius R = 48 m at base
- •Stepped spiral setbacks terminating wings at staggered heights (Wing 1 at 240/480 m, Wing 2 at 320/560 m, Wing 3 at 400/640 m)
- •Central hexagonal core rising through the pinnacle, transitioning into the tubular steel summit spire (z = 700 to 828 m)
- •Outrigger belt trusses and diaphragm floor levels at mechanical plant tiers connecting wings to the central core
- •Conformal frame and shell modeling with strict node registration, zero skipped nodes, and zero member crossings
2. Loads & Boundary Conditions
- •Full 6-DOF fixed boundary constraints across all raft foundation nodes at z = 0
- •Self-weight gravity with dead load of concrete floors and curtain wall cladding
- •High-altitude boundary layer wind pressure profile increasing as z^1.4 along +X
3. Simulation Results & Findings
- ✓Global lateral tip deflection stays strictly within civil engineering serviceability limits (H / 500)
- ✓Fundamental sway mode f₁ demonstrates characteristic low-frequency megatall flexibility
- ✓Euler eigenvalue buckling multiplier λ₁ confirms robust column reserve against gravity P-Delta collapse
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