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Kajima's Advanced Structural Control and Base Isolation Technologies

Seismic Structural Control System

Structural Control Technology
Increases the Added Value of Buildings

Our structural control technology has an effect on high-rise buildings exposed to
wind-induced shaking and long-period earthquake ground motions.

Compared with low-rise buildings, super high-rise buildings are affected strongly by wind-induced shaking and long-period earthquake ground motions. A distant,long-period earthquake has a significant impact on super high-rise buildings due to its long duration.

Our structural control technology that absorbs shaking energy provides very effective measures against such long-period earthquake ground motions.

image:30-story super high-rise building

30-story super high-rise building

image:Mechanism of long-period earthquake ground motions

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Our structural control technology is applicable to all types of soil and
features low cost and speedy construction.

In general seismic design, braces and earthquake-resistant walls are added, but this has its disadvantages: many reinforced structural frames, a reduction in the number of openings, and a great effect on the interior space. Structural control retrofit features a few reinforced structural frames (see the figure to the right) and no effect on the interior because the purposes are to improve the bearing capacity balance and to damp vibrations (ability to absorb seismic energy). Moreover, our structural control technology requires almost the same cost as seismic reinforcement, regardless of whether it is a modification or new construction, and works even if the ground is soft.

image:seismic reinforcement and structural control retrofit

Kajima’s structural control technology menus

Active-Passive Composite
Tuned Mass Damper System

High Damping System

Honeycomb Damper System

image:DUOX

  • Effectively controls the shaking of super high-rise buildings by means of double masses.
  • Features outdoor installation and compactness.

image:HiDAM

  • High-performance oil damper for high-rise buildings.
  • Works as safety measures against earthquakes and protects the living environment from wind-induced shaking.
  • Is employed in the “super reinforced concrete (RC) frame structure”.

image:HDS

  • Absorbs shaking by incorporating steel plates with honeycomb-shaped openings into structural members, such as columns and beams.
  • Has a special effect during a strong earthquake.
  • Features low cost and free maintenance.
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Damping System
in the Next Generation

High Damping System
for Nuclear Power Facility

Joint Damper System

image:HiDAX

  • Has a simple structure to absorb the energy of shaking that range from wind-induced vibrations to strong earthquakes.
  • Features high durability and easy maintenance.
HiDAX

image:Nu-DAM

  • Oil damper that has been developed for nuclear power facilities.
  • Features high speed capacity and durability.

image:JDS

  • Reduces shaking by connecting multiple buildings.
  • Features high durability and low cost.

Technology that is suitable to an existing building.

A building can be renovated using structural control while under normal occupancy.
This reduces the costs and inconvenience to the owner and building occupants.

  • The building can be occupied during construction.
  • Improve the seismic resistance and functions of the existing building.
  • It is possible to implement structural control with almost no access to the interior of the building.