Seismic response of base-isolated buildings using a viscoelastic model

Conference · Sun Aug 01 04:00:00 EDT 1993

OSTI ID:10180175

Uras, R A

Due to recent developments in elastomer technology,seismic isolation using elastomer bearings is rapidly gaining acceptance as a design tool to enhance structural seismic margins and to protect people and equipment from earthquake damage. With proper design of isolators, the fundamental frequency of the structure can be reduced to a value that is lower than the dominant frequencies of earthquake ground motions. The other feature of an isolation system is that it can provide a mechanism for energy dissipation. In the USA, the use of seismic base-isolation has become an alternate strategy for advanced Liquid Metal-cooled Reactors (LMRs). ANL has been deeply involved in the development and implementation of seismic isolation for use in both nuclear facilities and civil structures for the past decade. Shimizu Corporation of Japan has a test facility at Tohoku University in Sendai, Japan. The test facility has two buildings: one is base isolated and the other is conventionally founded. The buildings are full-size, three-story reinforced concrete structures. The dimensions and construction of the superstructures are identical. They were built side by side in a seismically active area. In 1988, the ANL/Shimizu Joint Program was established to study the differences in behavior of base-isolated and ordinarily founded structures when subjected to earthquake loading. A more comprehensive description of this joint program is presented in a companion paper (Wang et al. 1993). With the increased use of elastomeric polymers in industrial applications such as isolation bearings, the importance of constitutive modeling of viscoelastic materials is more and more pronounced. A realistic representation of material behavior is essential for computer simulations to replicate the response observed in experiments.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10180175
• Report Number(s): ANL/RE/CP--78822; CONF-930803--24; ON: DE93019541
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420200
58 GEOSCIENCES
580000
BEARINGS
BUILDINGS
EARTHQUAKES
FACILITIES, EQUIPMENT, AND TECHNIQUES
FOUNDATIONS
GEOSCIENCES
MATERIALS TESTING
NUMERICAL ANALYSIS
POLYMERS
SAFETY
SEISMIC EFFECTS
SHEAR PROPERTIES
SOIL-STRUCTURE INTERACTIONS
STRUCTURAL MODELS