Frequency response characteristics and response spectra of base-isolated and un-isolated structures

Conference · Thu Jul 06 00:00:00 EDT 1995

OSTI ID:104969

Mok, G C ^[1]; Namba, H ^[2]

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1. Lawrence Livermore National Lab., CA (United States)
2. Shimizu Corporation, Tokyo (Japan)

The transmissibility of seismic loads through a linear base-isolation system is analyzed using an impedance method. The results show that the system acts like a {open_quotes}low-pass{close_quotes} filter. It attenuates high-frequency loads but passes through low-frequency ones. The filtering effect depends on the vibration frequencies and damping of the isolated structure and the isolation system. This paper demonstrates the benefits and design principles of base isolation by comparing the transmissibilities and response spectra of isolated and un-isolated structures. Parameters of typical isolated buildings and ground motions of the 1994 Northridge earthquake are used for the demonstration.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 104969
• Report Number(s): UCRL-JC-121331; CONF-950740-93; ON: DE95017822; TRN: 95:006973
• Resource Relation: Conference: Joint American Society of Mechanical Engineers (ASME)/Japan Society of Mechanical Engineers (JSME) pressure vessels and piping conference, Honolulu, HI (United States), 23-27 Jul 1995; Other Information: PBD: 6 Jul 1995
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES
MECHANICAL STRUCTURES
SEISMIC ISOLATION
SPECTRAL RESPONSE
SAFETY ENGINEERING
SEISMIC EFFECTS