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@raptsoftware.com
email: sales@raptsoftware.com
email: support@raptsoftware.com
webpage:
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