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RE: Thin composite deck

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I think checking the natural frequency of the floor would be a more reliable indicator of suitability, than span to depth ratios. A few weeks back there was some discussion on the listserver about floor vibration relative to stairs. I think one of those posts mentioned a design guide for floor vibration in the US.




Steven CONRAD Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust


Roy Harrison & Associates

Consulting Engineers (Structural)

PO Box 104

Para Hills

SA 5096

South Australia

tel: 8395 2177

fax: 8395 8477


From: Jake Watson [mailto:jake.watson1(--nospam--at)]
Sent: Wednesday, 14 February 2007 12:59
Subject: Thin composite deck


We have a steel erector proposing a shored W3 composite deck with 3-1/4" light weight concrete on top (6-1/4" total) spanning 15'.  It works for deflection and loads however we are nervous about vibrations in the deck (hotel occupancy).  Verco recommends span to depth ratios stay in the low to mid twenties.  This would be nearly 29.  Does anyone have experience with this system?

Jake Watson, S.E.
Salt Lake City, UT