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Kajima's Advanced Structural Control and Base Isolation Technologies

Overview of Technologies to Protect Buildings from Various Vibrations

Various Motions Effecting Buildings

image:Earthquakes

Earthquakes range from small ones occurring so often, to ones having large magnitude. There is no doubt that life should be protected from these seismic vibrations, and it is further important to prevent exposure of living spaces to the following potential hazards:collapsed furnitures, deformed doors, broken windows, cracked walls, and dropped ceilings.

image:Strong wind

Wind, a natural force, is a cause of shaking buildings. The higher the building, the higher the wind force; that is, the higher the floor, the larger the amplitude. Buildings requiring comfortable living space, such as high-rise hotels and condominiums, need measures to reduce the amplitude of strong wind-induced shaking.

image:Vibration

Buildings adjacent to a heavy-traffic road or railway lose their comfort because vibrations occur every time a large truck or train passes by. Of course, comfort must be ensured. Buildings with precision equipment, such as hospitals and high-tech laboratories, should be protected. Even the smallest vibration amplitude in these buildings can have an adverse effect.

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Structural Control and Base Isolation Technologies

A typical building is design to endure earthquakes by using braces and earthquake-resisting walls in accordance with the applicable Building Codes to prevent collapse for the safety of the occupants. However, measures against strong earthquakes are necessary to achieve more superior structural performance in certain type of structures. Superior seismic performance can be achieved by the use of structural control and base isolation technologies.

Control Building Movement

image:Structural Control

image:Structural Control

A damper is installed in a building to absorb and reduce shaking. Various kinds of dampers are available according to the conditions of the building.

  • Reducing seismic and wind-induced shaking significantly
  • Good effect on long-period earthquake ground motions
  • Low cost and short installation time

Isolate Ground Movement

image:Base Isolation

image:Structural Control

An isolator is installed between the ground and a building to reduce the seismic force transferred to the building.

  • Significantly improving seismic resistance and safety
  • Preventing falling down of furniture and appliances
  • Possibility of reducing traffic-originated vibrations