Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

'Spring' supported mat

[Subject Prev][Subject Next][Thread Prev][Thread Next]
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'
supports differently. 

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.,

NOTICE - This communication may contain confidential and privileged
information that is for the sole use of the intended recipient. Any viewing,
copying or distribution of, or reliance on this message by unintended
recipients is strictly prohibited. If you have received this message in
error, please notify us immediately by replying to the message and deleting
it from your computer.