What Is a Seismic Isolation Bearing Type?
Isolation bearings (the seismic's — the decoupling) are the elastomeric (the lead-rubber — the LRB; the damping's), the sliding (the friction pendulum — the FPS; the restoring's), and the hybrid (the combined — the tuned). The type: the period's (the 2-4 seconds — the shifted), the damping's (the 10-30% — the energy's), and the displacement's (the 20-40 inches — the accommodated). The isolation's — the bearing selected.
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Elastomeric (LRB)
The rubber (the laminated — the steel's; the flexibility), the lead (the core's — the yielding; the damping's 25-30%), the period (the 2-3 seconds — the shifted), and the use (the buildings' — the standard; the retrofits').
Sliding (FPS)
The pendulum (the dish's — the radius; the restoring), the friction (the slider's — the damping's 10-20%; the velocity's), the displacement (the 30-40 inches — the accommodated), and the use (the long-period — the bridges'; the large's).
Selection
The period (the target's — the site's; the 2-4s), the damping (the needed — the displacement's), the vertical (the load's — the bearing's; the stability), the testing (the prototype's — the 100%; the production's — the sampling), and the code (the ASCE 7 Ch. 17 — the provisions'). The bearing is the isolation's — the type matched to the demand.
The bottom line
Select isolation bearings by target period/damping/displacement: LRB (elastomeric, 25-30% damping) vs. FPS (sliding pendulum, self-restoring) per ASCE 7 Ch. 17 — prototype-test every design.
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