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# Re: Response Spectrum Analysis

• To: seaint(--nospam--at)seaint.org
• Subject: Re: Response Spectrum Analysis
• From: Ali Bakhshi <bakhshi(--nospam--at)ipc.hiroshima-u.ac.jp>
• Date: Thu, 01 Apr 1999 20:06:19

```Dear Francis,

The main problem is how to interpret Rw (or any other parameters related to
ductility factor in various codes) in design. There are many invaluable
of them here:

1.Earthquake design criteria / by G.W. Housner and P.C. Jennings. --
Earthquake Engineering Research Institute, 1982. -- (Engineering monographs
on earthquake criteria, structural design, and strong motion records ; v. 4

2. The Seismic design handbook / edited by Farzad Naeim. -- Van Nostrand
Reinhold, 1989. -- (Structural engineering series)

3..ATC-2: an evaluation of a response spectrum approach to seismic design
of buildings / by Applied Technology Council, for National Science
Foundation, Research Applied to National Needs Program and National Bureau
of Standards. -- Repr.. -- ATC], 1981

4. Manual of seismic design / James L. Stratta. -- Englewood Cliffs, N.J. :
Prentice-Hall, 1987

5. Seismic design of buildings / James Ambrose, Dimitry Vergun. -- Wiley,1985

Hope that this suggestion is not to complicate your problem excessively!

At 03:12 p.m. 99/03/31 +0800, you wrote:
>I'm having a problem with regards to the seismic analysis of structures
>using response spectrum analysis. We usually use this dynamic analysis for
>multi-storey structures. For 5 storey-high structures and below, we use the
>UBC minimum lateral force procedure which normally gives a conservative
>value of EQ forces.
>
>With regards to response spectrum analysis, using STAAD or ETABS, there is a
>portion there which requires a a value like the SCALE of the forces. I know
>of some who input on this blindly like using a value of 4.445 or something.
>
>I commonly use the value obtained from the dynamic base shear divided by the
>base shear from the minimum Lateral Force Procedure of UBC.
>
>Am I right on this or have I missed out some things. I tried to read other
>materials but it doesn't mention the scale to be used?
>
>
>
>Thanks,
>
>
>
>
>
>
>
______________________________
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
______________________________

```