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I don't have the CRSI design guide. I had found its reference from google search. Unfortunately, haven't done such a structure myself. you may however try following sources as well for finding your desired information: 1. Check Reynold's Concrete Design Handbook. May be you could find some relevant material there. 2. Some technical documents are available at following link. May be you could find something helpful here: http://www.bubbledeck-uk.com/download.html 3. Article on Behaviour and analysis of voided concrete slabs (http://retro.seals.ch/cntmng?pid=bse-re-003:1989:57/1:57/2::743) 4. Finite element analysis and design of post-tensioned voided slab bridge decks (http://www.researchgate.net/profile/Jacobo_Diaz2/publication/220291881_A_computer_code_for_finite_element_analysis_and_design_of_post-tensioned_voided_slab_bridge_decks_with_orthotropic_behaviour/links/02e7e5370a7c5613ae000000.pdf?origin=publication_detail) 5. PLASTIC VOIDED SLAB SYSTEMS - APPLICATIONS AND DESIGN (https://krex.k-state.edu/dspace/bitstream/handle/2097/16874/CoreyMidkiff2013.pdf?sequence=1) 6. Presentation on Innovative Structural Slab Practices – Voided Slabs (http://www.concrete.org/Portals/0/Files/PDF/Webinars/Mota.pdf). It was sponsored by ACI/ASCE 421. Describes the CRSI design guide too, bot not in much detail. Good luck.

W.s Waqas, Here are some references that can help you get started: 1) ACI 351.3 Foundation For Dynamic Equipment 2) Design of Structures and Foundations for Vibrating Machines by Suresh C. Arya You can get both the documents from google easily. Other than these two there are some discussions in the forum that will provide you some insight about the subject. - http://www.sepakistan.com/topic/1383-pile-design-for-machine-foundation/ - http://www.sepakistan.com/topic/1666-superimposed-beams/ Thanks.