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

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.
Authors:
 [1] ;  [2]
  1. Lawrence Livermore National Lab., CA (United States)
  2. Shimizu Corporation, Tokyo (Japan)
Publication Date:
OSTI Identifier:
104969
Report Number(s):
UCRL-JC--121331; CONF-950740--93
ON: DE95017822; TRN: 95:006973
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
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
Research Org:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; MECHANICAL STRUCTURES; SEISMIC ISOLATION; SPECTRAL RESPONSE; SAFETY ENGINEERING; SEISMIC EFFECTS