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Natural period of vibration 'T' for stacked exchangers

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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
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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