Summary of experimental tests of elastomeric seismic isolation bearings for use in nuclear reactor plants

Conference · Wed Jan 01 04:00:00 EST 1992

OSTI ID:5282022

Seidensticker, R W; Chang, Y W; Kulak, R F

This paper describes an experimental test program for isolator bearings which was developed to help establish the viability of using laminated elastomer bearings for base isolation of nuclear reactor plants. The goal of the test program is to determine the performance characteristics of laminated seismic isolation bearings under a wide range of loadings. Tests were performed on scale-size laminated seismic isolators both within the design shear strain range to determine the response of the bearing under expected earthquake loading conditions, and beyond the design range to determine failure modes and to establish safety margins. Three types of bearings, each produced from a different manufacturer, have been tested: (1) high shape factor-high damping-high shear modulus bearings; (2) medium shape factor-high damping-high shear modulus bearings; and (3) medium shape factor-high damping-low shear modulus bearings. All of these tests described in this report were performed at the Earthquake Engineering Research Center at the University of California, Berkeley, with technical assistance from ANL. The tests performed on the three types of bearings have confirmed the high performance characteristics of the high damping-high and low shear modulus elastomeric bearings. The bearings have shown that they are capable of having extremely large shear strains before failure occurs. The most common failure mechanism was the debonding of the top steel plate from the isolators. This failure mechanism can be virtually eliminated by improved manufacturing quality control. The most important result of the failure test of the isolators is the fact that bearings can sustain large horizontal displacement, several times larger than the design value, with failure. Their performance in moderate and strong earthquakes will be far superior to conventional structures.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: DOE; NSF; USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5282022
• Report Number(s): ANL/CP-75738; CONF-9203135--2; ON: DE92011835; CNN: CES-8800871
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
36 MATERIALS SCIENCE
360603 -- Materials-- Properties
42 ENGINEERING
420200 -- Engineering-- Facilities
Equipment
& Techniques
BEARINGS
DAMPING
DYNAMIC LOADS
ELASTOMERS
MECHANICAL PROPERTIES
NUCLEAR FACILITIES
NUCLEAR POWER PLANTS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
POWER PLANTS
REACTOR SAFETY
RUBBERS
SAFETY
SEISMIC ISOLATION
SHEAR PROPERTIES
TESTING
THERMAL POWER PLANTS