Seismic Performance Evaluation of Seismically Isolated Buildings Introduced to the Building Code of Japan

[+] Author and Article Information
Mitsumasa Midorikawa, Masanori Iiba

Building Research Institute, 1 Tachihara, Tsukuba, Ibaraki, 305-0802 Japan

Norihide Koshika

Kajima Corporation, 6-5-30, Akasaka, Minato-ku, Tokyo, 107-8502 Japan

J. Pressure Vessel Technol 126(1), 18-24 (Feb 26, 2004) (7 pages) doi:10.1115/1.1638390 History: Received March 30, 2003; Revised June 25, 2003; Online February 26, 2004
Copyright © 2004 by ASME
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Basic acceleration response spectrum at engineering bedrock So corresponding to critical damping ratio h of 0.05 of a SDOF system
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Amplification factor of surface soil layers Gs
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Acceleration response spectrum at ground surface corresponding to critical damping ratio h of 0.05 of a SDOF system; in case of Z=1.0
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Model of seismically isolated structure (M: mass of superstructure; Keq: equivalent stiffness of seismic isolation system, and, heq: equivalent viscous damping ratio of an ESDOF system)
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Response shear and displacement in demand and capacity spectra (heq: equivalent viscous damping ratio of an ESDOF system)
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Load-deformation curves of each element and total hysteresis curve of seismic isolation system
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Prediction of response of seismically isolated building using demand spectrum for heq and capacity spectrum
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Relationship between equivalent damping heq and displacement
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Dissipation energy and potential energy of elasto-plastic hysteretic system: (a) dissipation energy of elasto-plastic damper; (b) potential energy of elasto-plastic damper; and (c) potential energy of elastomeric isolator.
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Damping coefficient Cvi and equivalent velocity Veq for fluid damper
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Comparison of response displacements obtained from simplified procedures and time history analysis
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Tangential stiffness at typical displacement δt




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