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'Spring' supported mat[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: 'Spring' supported mat
- From: "Vasu, Ravi" <Ravi.Vasu(--nospam--at)jacobs.com>
- Date: Fri, 1 Oct 2004 14:14:08 -0400
Title: 'Spring' supported mat
I need help on the 'spring' supports used in Fdn mat design. I tried Staad
& PCAMats in a mat design, (with 1ft x 1ft elements). Both are treating the 'spring'
Staad takes the Static principle & it satisfies the applied forces = Spring reactions.
Moreover Staad 'dumps all horizontal reactions at the base node of the pier. This I think
might change the distribution pattern. All other nodes' horizontal reactions = 0. I think
Staad gives conservative results.(sometimes the fdn fails due to limitation in size)
But PCAMats takes into account the spring's potential & kinetic energy, with the result,
the spring reactions are somewhat less than the applied forces.
The weaker the spring, less the reactions. Both approaches are different & takes care of the 'Flexible' mat.
This you can see in the soil bearing pressure around the pier is more & away, it is less.
I need to know which approach is more 'correct'? Is there any reference/hand cals/text book to find
spring reactions(say, for a simple spread footing)? Has anybody tried both the approaches?
Ravi Vasu, P.E.,
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