trivia

TIPS

Three patterns of earthquake countermeasures Difference between "seismic resistance," "seismic control," and "seismic isolation

This is an illustration of seismic/vibration control (vibration control)/seismic isolation, a technology to protect important items (in this case, buildings) from earthquakes.

resistant to earthquakes

 Indicates that the structure will not break under seismic forces, and that it (the structure, etc.) can withstand them.

Figure 1: Image of building earthquake resistance

Seismic Response Control (Vibration Control)

 The term “damping” refers to the act of applying a resistive force to motion or vibration to dampen them. Typical examples include hydraulic vibration dampers and mass dampers (TMDs), etc. Vibration dampers are commonly used to counter seismic motion in buildings, and TMDs are commonly used to counter wind vibration and other small-amplitude, physically felt vibration problems.

Example of seismic damping (vibration control) by TMD
interpoint (interword separation)Protecting Buildings from Earthquakes. ~100-ton class TMD case study~.
interpoint (interword separation)Solving wind sway problems in pencil buildings! ~Increased livability and comfort without disturbing the interior of the building!

Figure 2: Image of building vibration control (vibration)

base isolation (in buildings)

 Indicates that the building is less likely to transmit seismic shaking during an earthquake (i.e., is immune from earthquakes). Typical examples include laminated rubber installed in building foundations, which deforms to absorb seismic forces, thereby reducing building shaking.

Figure 3: Image of seismic isolation of a building

*References
 New Pollution Prevention Technology and Laws and Regulations 2016 Noise and Vibration Edition Pollution Prevention Technology and Laws and Regulations Editorial Board Edited by Japan Meteorological Agency Seismic Intensity Class (March 2009)