Base Isolation for Reinforced Concrete Structures

by James M. Kelly, Univ of California, Berkeley, CA, USA,
Michael C. Griffith, Univ of California, Berkeley, CA, USA,

Document Type: Proceeding Paper

Part of: Materials and Member Behavior


A recent experimental program has been carried out at the Earthquake Simulator Laboratory of the Earthquake Engineering Research Center in which a 1/5th scale reinforced concrete structural model mounted on three types of isolation systems has been tested with a wide selection of simulated earthquake signals. The test structure is 12 multiplied by 16 multiplied by 20ft tall (3. 7 multiplied by 4. 9 multiplied by 6. 1m) and weighs 100,000 lb (470kN). It had been loaded to failure on the shake table as a fixed base structure. It was repaired by epoxy grouting and then tested as an isolated structure. The test program has demonstrated that isolation provides substantial reductions in seismic loading as compared with fixed base construction and that it can be an effective method for the restoration of damaged structures.

Subject Headings: Base isolation | Reinforced concrete | Structure reinforcement | Concrete structures | Failure loads | Seismic loads | Load tests | Dynamic models

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