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Re: CQC and SRSS

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Dear colleagues,

With full respect to all who correctly pointed out some useful comments,
you may have a look at the followin papers for further details, of course
there are many other else. Just keep in mind that the CQC appears much
superior when the torsional modes are among the dominated modes, i.e. 1st
3-5 modes. This may be caused by closedly-spaced modes and/or specific plan
irregularity.

1. Eidinger, J. M.; Kok, S. B.; Murray, T. "Practical application of CQC
modal combination technique for a fuel reprocessing plant", Transactions of
the 8th International Conference on Structural Mechanics in Reactor
Technology, North-Holland Physics Publishing, Amsterdam, 1985, pages
515-522, Vol. K(a), Paper K 11/1

2. Cheng, F. Y.; Ger, Jeng-Fuh "Maximum response of buildings to
multi-seismic input", Dynamics of Structures: Proceedings of the Sessions
at Structures Congress '87 Related to Dynamics of Structures, American
Society of Civil Engineers, New York, 1987, pages 397-410

3. Amini, A.; Trifunac, M. D. "A statistical basis for spectrum
superposition in response to earthquake excitation", Proceedings of the
Eighth World Conference on Earthquake Engineering, Prentice-Hall, Inc.,
Englewood Cliffs, New Jersey, 1984, pages 179-186, Vol. IV, 

4. Sinha, R.; Igusa, T. "CQC and SRSS methods for non-classically damped
structure", Earthquake Engineering & Structural Dynamics, 24, 4, Apr. 1995,
pages 615-619.

Hope this helps.
Ali   

______________________________
Ali Bakhshi, Dr. of Eng.
Earthquake Engineering  Lab
Dept of Structural Eng.
Hiroshima University
TEL:  +81-824-24-7862
FAX:  +81-824-24-7796
E-mail:  bakhshi(--nospam--at)ipc.hiroshima-u.ac.jp
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