Tuned Mass Dampers in Action
At extreme altitudes, buildings do not just stand; they sail. The wind forces pushing against a 600-meter flat facade are enough to tip ordinary structures. The science of wind engineering mitigates these forces through aerodynamics and active damping.
Vortex Shedding
When wind hits a flat surface, it creates alternating vortices on the leeward side. If the frequency of these vortices matches the building's natural sway, the building oscillates violently. Twisting facades, like the Shanghai Tower, disrupt these vortices.
Tuned Mass Dampers
A massive pendulum suspended near the top of the tower sways in the opposite direction of the wind. Taipei 101 houses a famous 660-tonne steel sphere functioning as a TMD.
Aerodynamic Profiling
Architects shape the tower not just for aesthetics, but to let the wind slide past. Tapering, chamfered corners, and "porosity" (holes through the building, as seen in the Shanghai World Financial Center) are strict engineering requirements to alleviate wind pressure.