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Re: 12" Hollow Core Plank Span

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Rich,

Vibration, deflection and ductility!

At 12:00 PM 5/06/2008, you wrote:
I've been asked to design a building that has precast hollow core plank spanning 44 feet. I'm looking for some guidance from others who have experience in longer span using hollow core plank. My past experience has primarily been 8" plank in spans under 30 feet.

Technically, by the span tables, 12" plank will span 44 feet. It takes a lot of prestressing to get it there. My concern is with serviceability issues. With using lots of prestressing am I likely to see upward creep in the plank, or is the gravity dead load usually enough to overcome upward creep? Has anyone experienced this before. What practical issues should I consider when using longer span floor plank?

Thanks for your insight.

Rich


Regards  Gil Brock
Prestressed Concrete Design Consultants Pty. Ltd. (ABN 84 003 163 586)
5 Cameron Street Beenleigh Qld 4207 Australia
Ph +61 7 3807 8022              Fax +61 7 3807 8422
email:          gil(--nospam--at)raptsoftware.com
email:          sales(--nospam--at)raptsoftware.com
email:          support(--nospam--at)raptsoftware.com
webpage:        http://www.raptsoftware.com


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