Modeling of seismic isolation bearings including shear deformation and stability effects
- National Univ. of Singapore (Singapore)
- Univ. of California, Berkeley (USA)
Elastomeric bearings designed for aseismic base isolation typically have a low shear rigidity in order to achieve a low isolation frequency and are thus modeled by a flexural-shear column on the basis of Haringx's theory. The buckling load of a flexural-shear column is considerably reduced by the shear effect. It is therefore essential to account for the stability effect due to a compressive load on the dynamic performance of these bearings. In this paper, an exact viscoelastic model consistent with Haringx's theory is first reviewed. A simplified symmetric model consisting of springs and rigid plates is then discussed. Experimental results for four different sets of natural rubber bearings are presented. It is shown that both models can describe with good accuracy the stability effects on the dynamic stiffness, damping factor and height reduction of bearings. In spite of its simplicity, the simplified model is found to agree very well with the exact model. Lastly, using the simplified model, the applicability of the Southwell plot to predict the buckling load of elastomeric isolation bearings is examined.
- OSTI ID:
- 5516414
- Report Number(s):
- CONF-8901202-; CODEN: AMREA
- Journal Information:
- Applied Mechanics Reviews; (United States), Vol. 42:11; Conference: PACAM '89: 1st Pan American congress of applied mechanics, Rio de Janeiro (Brazil), Jan 1989; ISSN 0003-6900
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
BUILDINGS
SEISMIC EFFECTS
MATHEMATICAL MODELS
BEARINGS
DAMPING
FLEXURAL STRENGTH
MATERIAL BUCKLING
NATURAL RUBBER
SHEAR PROPERTIES
STABILITY
BUCKLING
ELASTOMERS
MECHANICAL PROPERTIES
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYMERS
RUBBERS
420200* - Engineering- Facilities
Equipment
& Techniques
580000 - Geosciences