@calvy28 12 March 2021 more from that month

Tokyo Skytree is designed to let strong wind pass through the gaps between trusses. At its base, rubber dampers are used to reduce movement. Skytree also has a unique vibration-control system: A 375-meter-tall concrete core column at its center that is connected to the tower’s outer frame by a series of flexible “dampers” but structurally independent of it. The column moves with a time lag and reduces the vibration of the entire building by up to 50% during an earthquake and 30% in strong winds.