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Re: 33-ft simple span slab

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Ralph,
 
I know well a building built over 30 yrs ago in my area. It used a 8" composite slab (4" pre-tensioned slab with 4" topping) for a 30' span floor. There have been no reported problems with serviceability even after more than 30 years.
 
Ben
----- Original Message -----
Sent: Thursday, May 12, 2005 4:04 PM
Subject: Re: 33-ft simple span slab

I second that emotion.  A long time ago I became aware of a square, 2-way 8" floor slab spanning about 30' (each way) that deflected very excessively.  This situation sounds like it would be even worse, being one-way.

Ralph Hueston Kratz, S.E.
Richmond CA USA

In a message dated 5/12/05 5:49:15 PM, gil(--nospam--at)raptsoftware.com writes:
Ben,
I would be very worried about deflections, vibrations and everything else. It is too thin. Do the calculations.


At 06:18 AM 13/05/2005, you wrote:
I am pondering on using  8" composite slab (3" pre-tensioned plank with 5" topping) for a 33-ft simple span floor slab in a dormitory building.  The plank will be shored at mid span before topping. My only concern is the long-term deflection. Has any one had similar experience?