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Re: Natural period of vibration 'T' for stacked exchangers

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Refer to Item C of the Appendix you referenced.  You have a two (or more)
mass structure.  To evaluate this relationship, you need to be able to
evaluate the deflections at each exchanger due to lateral loads.  This
method is a variation on the Rayleigh Method.  As an alternative, you could
model the entire system in an FEM program.  No matter what you do, you are
going to have to quantify the mass and stiffness of your system to
determine the fundamental period of vibration.

Regards,

Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA

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                      "Vasu, Ravi"                                                                                                     
                      <Ravi.Vasu@jacobs.c      To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>                                           
                      om>                                                                                                              
                      11/20/02 08:16 AM        cc:                                                                                     
                      Please respond to                                                                                                
                      seaint                   Subject:  Natural period of vibration 'T' for stacked exchangers                        
                                                                                                                                       
                                                                                                                                 ..... 
                                                                                                                                       




Please refer to the "Guidelines for seismic evaluation abd
design of petrochemical facilities"(Appendix 4.A) by ASCE committee.
This section tells you how to find natuaral period for non building
structures
such as towers...  Is there any guidelines to find natural period for
stacked exchangers?  Should we consider this as one mass?.
The connecting plate between the exchangers may be a weak component,
might affect 'T'.  Do we need to consider this?

Thanks for your time & response.

Ravi Vasu, P.E.,

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