Frequency and temperature dependence of high damping elastomers
High damping steel-laminated elastomeric seismic isolation bearings are one of the preferred devices for isolating large buildings and structures. In the US, the current reference design for the Advanced Liquid Metal Reactor (ALMR) uses laminated bearings for seismic isolation. These bearings are constructed from alternating layers of high damping rubber and steel plates. They are typically designed for shear strains between 50 and 100% and are expected to sustain two to three times these levels for beyond design basis loading conditions. Elastomeric bearings are currently designed to provide a system frequency between 0.4 and 0.8 Hz and expected to operate between {minus}20 and 40 degrees Centigrade. To assure proper performance of isolation bearings, it is necessary to characterize the elastomer`s response under expected variations of frequency and temperature. The dynamic response of the elastomer must be characterized within the frequency range that spans the bearing acceptance test frequency, which may be as low as 0.005 Hz, and the design frequency. Similarly, the variation in mechanical characteristics of the elastomer must be determined over the design temperature range, which is between {minus}20 and 40 degrees Centigrade. This paper reports on (1) the capabilities of a testing facility at ANL for testing candidate elastomers, (2) the variation with frequency and temperature of the stiffness and damping of one candidate elastomer, and (3) the effect of these variations on bearing acceptance testing criteria and on the choice of bearing design values for stiffness and damping.
- Research Organization:
- Argonne National Lab., IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 10183299
- Report Number(s):
- ANL/RE/CP--78944; CONF-930803--22; ON: DE93019539
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
210500
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900
36 MATERIALS SCIENCE
360603
BEARINGS
DAMPING
ELASTOMERS
FREQUENCY DEPENDENCE
LIQUID METAL COOLED REACTORS
MECHANICAL PROPERTIES
POWER REACTORS
BREEDING
REACTOR SAFETY
RESTRAINTS
SEISMIC ISOLATION
SHOCK ABSORBERS
SOIL-STRUCTURE INTERACTIONS
TEMPERATURE DEPENDENCE