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Newsletter  2013.4  Index

Theme : "Fluids Engineering for the World’s Top Technologies"

  1. Structural Design of Tokyo Sky Tree
    Atsuo KONISHI (Nikken Sekkei Ltd.)
  2. Pressure Fluctuation Analysis in Tunnels for High Speed Train
    Yukinobu ABE (Hitachi, Ltd. )
  3. Design and Development of A Multistage Axial-Flow Compressor for Industrial Gas Turbine
    Akinori MATSUOKA (Kawasaki Heavy Industries, Ltd.)
  4. Integrated Coal Gasification Combined Cycle (IGCC) and Fluid Dynamics
    Shozo KANEKO (The University of Tokyo)
  5. Biomechanical Simulations for Medical Treatment
    Shu TAKAGI (The University of Tokyo)
  6. Detailed Numerical Study on Turbulent Primary Atomization and Vapor Mixing of a Fuel Spray
    Junji SHINJO (Japan Aerospace Exploration Agency)
  7. Editorial Note
    (D. Sasaki, I. Kinefuchi, I. Hagiya)

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Structural Design of Tokyo Sky Tree

Structural Engineering Department,
Nikken Sekkei Ltd.


Tokyo Sky Tree (Fig.1) is a new core facility of digital broadcasting for Tokyo metropolitan area of Japan, and it is required high criteria because of its heavy public responsibility to send valuable information to the victims in a big disaster.

The maximum disturbance for the structural design is the strong wind(Fig.2) that wind speed is 83m/s at the top of this tower, and the big earthquake that the response spectrum is over 100cm/s (h=5%) at the natural period of this tower. While, the structural safety limit according to L2 disturbance, the maximum level that the building regulations in Japan require to the domestic buildings, is almost no damage.

Unique systems for vibration control, the core column system (Fig.3) and the rigid substructure system, were invented for this tower to satisfy the severe requirements. The core column system uses the core shaft of the emergency staircase built with a reinforced concrete tube wall as a weight applying the theory of TMD, tuned mass damper. This vibration control system is effective in the wide range and a lot of kind of earthquake. It can reduce maximum 50% the acceleration response during the earthquake and maximum 30% during strong wind.The rigid substructure system constitutes of a rigid wall pile and soft ground, and makes use of a relative displacement between the rigid substructures and soft ground to gain damping ability, the radiation damping.

Key words

Broadcast Tower ; Array observation ; Aerological wind observation ; Wind tunnel experiment ; Artificial wind wave ; Vibration control systemr

Fig. 1:Tokyo Sky Tree

Fig. 2:Measurement of wind

Fig.3:Section of the core column

Last update: 4.8.2013