How does seismic isolation protect structures from earthquakes?

Seismic base isolation protects buildings and infrastructure from earthquake forces by substantially decoupling the superstructure from its shaking substructure. Utilizing elements like rubber bearings, friction bearings, and dampers, this technique absorbs lateral impacts and minimizes structural damage. While powerful, isolation systems do not make buildings entirely earthquake-proof, but instead aim to prevent catastrophic collapse and preserve functionality.

What we know

• Base isolation is a collection of structural elements designed to decouple a building superstructure from its substructure resting on shaking ground. [3]
• Isolation devices can be constructed using rubber bearings, friction bearings, ball bearings, spring systems, or metallic roller bearings. [3, 4]
• Earthquake-resistant structures are engineered to prevent collapse during rare earthquakes and limit functionality loss during more frequent ones. [5]
• Base isolation technology can be applied to both new structural designs and seismic retrofits of existing historical monuments. [3]

Where to go next

• the bigger pictureWhat is seismic base isolation?
• how it workedHow do metallic roller bearings work in earthquakes?
• what caused itHow are earthquake-resistant structures designed?
• a case in pointWhat caused the eastern span of the Bay Bridge to be replaced?
• how we knowHow did the Loma Prieta earthquake impact California bridges?
• an unexpected connectionCan seismic isolation protect individual works of art?Base isolation technology is used on a small scale to safeguard museum equipment and statues, such as Rodin's Gates of Hell.

Sources

• [1]Eastern span replacement of the San Francisco–Oakland Bay Bridge (Wikidata Q5330624) · CC0 1.0
• [2]Eastern span replacement of the San Francisco–Oakland Bay Bridge · CC BY-SA 4.0
• [3]Seismic base isolation · CC BY-SA 4.0
• [4]Metallic roller bearing · CC BY-SA 4.0
• [5]Earthquake-resistant structures · CC BY-SA 4.0