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Some Topics in the Modal FRS Method

[+] Author Affiliations
B. L. Ly, L. Sun

Atomic Energy of Canada Limited, Mississauga, ON, Canada

Paper No. PVP2008-61013, pp. 83-89; 7 pages
doi:10.1115/PVP2008-61013
From:
  • ASME 2008 Pressure Vessels and Piping Conference
  • Volume 8: Seismic Engineering
  • Chicago, Illinois, USA, July 27–31, 2008
  • Conference Sponsors: Pressure Vessels and Piping
  • ISBN: 978-0-7918-4831-9 | eISBN: 0-7918-3828-5
  • Copyright © 2008 by Atomic Energy of Canada Ltd.

abstract

The following five common topics in the modal Floor Response Spectrum (FRS) method are examined: 1) The relationship between the effective mass and the total mass; 2) Estimation of the base shear; 3) Identification of a local mode; 4) The uniform acceleration to be applied in the equivalent static analysis method; 5) Correction for the residual rigid modes. This paper shows the usage of effective mass in determining the base shear. A quantitative method based on the ranking of the importance of a mode and the importance of a mass in a mode is given, in addition to graphic animations, to exclude a local mode. It also provides a more realistic static method with a less overly conservative acceleration.

Copyright © 2008 by Atomic Energy of Canada Ltd.

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