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Tokyo Skytree is designed to control earthquake motion, not to be immune to earthquakes. Its approach combines a steel truss tower, a foundation built to resist forces at the base, a central reinforced-concrete core linked to the outer tower by oil dampers, and separate tuned mass dampers near the antenna tip.
How Tokyo Skytree’s earthquake-control system works
At 634 metres, Tokyo Skytree is a slender structure that must manage horizontal movement as well as support its own weight. Its design uses several measures at different points in the load path: the foundation resists forces where the tower meets the ground; the steel frame carries forces through the structure; and damping systems help control movement. The official overview describes it as the world’s tallest self-supporting radio tower. TOKYO SKYTREE official overview
The outer steel truss carries forces
The tower’s outer structure is a steel truss made with high-strength steel. Its triangulated members and welded branch joints form the frame that transfers forces through the tower. The official project overview also says engineers investigated the site’s deep geological structure and simulated how the ground would shake. TOKYO SKYTREE official structural overview
The foundation resists forces at the base
Knuckle-shaped wall piles in the foundation increase friction and help resist the forces acting at the base of a tall, slender tower. This is a different job from the damping systems above: the piles help anchor and transfer forces into the ground, while the tower’s frame and dampers address how the structure responds to movement.
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What the shinbashira does
The shinbashira is a reinforced-concrete cylinder 375 metres tall and 8 metres in diameter. It contains the emergency stairway. Inspired by the central core-column concept associated with traditional Japanese pagodas, Skytree’s shinbashira is a modern structural element, not a simple copy of a pagoda. TOKYO SKYTREE official educational page TOKYO SKYTREE official overview
The core is structurally separated from the outer steel tower over part of its height rather than rigidly joined to it throughout. The two structures move at different cycles, and oil dampers between them cushion and control their relative movement. The core’s upper portion acts as an added mass: by moving out of phase with the outer tower, it helps reduce the tower’s response. TOKYO SKYTREE official structural-design page TOKYO UPDATES, Tokyo Metropolitan Government
Does Tokyo Skytree have tuned mass dampers?
Yes. A separate pair of tuned mass dampers sits at the tip of the gain tower, the antenna-supporting structure. The official educational page identifies one unit weighing 40 tonnes and the other 25 tonnes, and says the system can reduce gain-tower sway by up to 30%. That figure concerns the gain tower; it should not be read as a reduction for the entire Skytree. TOKYO SKYTREE official educational page
What the published reduction figures mean
Several published percentages describe different measures, so they should not be combined or treated as equivalent. The sources state the following:
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →| Figure | What it describes | Source and qualification |
|---|---|---|
| About 40% | Reduction in response shear force during a major earthquake | TOKYO SKYTREE’s official structural-design page; publication year not stated. Source |
| Up to 50% | Reduction in the tower’s sway | TOKYO UPDATES, Tokyo Metropolitan Government; the cited article’s exact publication date was not supplied. Source |
| Up to 30% | Reduction in gain-tower sway | TOKYO SKYTREE’s official educational page; publication year not stated. Source |
These are reported design-performance figures for distinct responses, not a guarantee that the tower will experience no damage in every earthquake. The sources describe engineering measures and modeled performance, not immunity to every possible event.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why the measures work as a system
- At the ground: knuckle-shaped wall piles increase friction and resist forces at the tower’s base.
- Through the structure: the triangulated steel truss carries and transfers horizontal forces.
- Between core and tower: oil dampers control relative movement, while the shinbashira’s upper part acts as an added mass.
- At the antenna tip: the two tuned mass dampers address sway of the gain tower.
Tokyo Skytree opened on 22 May 2012. Its engineering is best understood as coordinated vibration control across the foundation, main tower and gain tower—not as one device or one percentage that makes the structure “quake-proof.” TOKYO SKYTREE official overview
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