thickened slab
thickened slab
(OP)
Can someone help me out or tell me where to find information on how to structurally analyse a thickened slab foundation.....
thank you
Francisco
thank you
Francisco
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RE: thickened slab
you will find a free download version
also on-line help will be found
RE: thickened slab
The Portland Cement Association (PCA) has detailed publications for designing slabs on grade. The publication(s) address considerations for truck, fork lift traffic and high stacking loads that are commonly found in warehouses. They are relatively inexpensive.
RE: thickened slab
respects
IJR
RE: thickened slab
RE: thickened slab
RE: thickened slab
It was an indirect way to get someone to get more into the subject. But as I can see, I cant extend it any further.
Well when we design foundations manually, we go on finding moments and detail accordingly, and if it is a pile cap then shear stuff and deep beam action comes in. When you do that with software you always have to tell the software of your assumptions, like is it a thick or thin plate and in my office we always have to argue without actually having a feel for the differences between the two.
Thanx for the interest
regs
IJR
RE: thickened slab
I guess you can classify "rigid" foundations as " thick" and " flexible" as " thin". And for sure you know what is a rigid foundaion.
regards
RE: thickened slab
Your explanation makes a lot of sense and thanx , but what prompted me to ask for the boundary between the two has a lot more to do with software term "thick shell" and "thin shell". If you visit the Finite element forum where I found a thread related to this discussion, you will see what I mean-there simply are varying opinions, and surprisingly, no one mentions flexible or rigid, though most relate shear deformations to "thick shell" modelling. Excuse my ignorance and perhaps exxaggeration , but, is utilizing "thick shell" modelling in software the same as carrying out rigid foundation analysis?
respects
IJR
RE: thickened slab
RE: thickened slab
RE: thickened slab
Hence, if you choose thin elements where shear needs be accounted element per element, as a result of the dimension to thickness ratio, you will get the moments bigger than they must (as it is seen when more exactly determined), and shear under-represented, i.e., less shear than required. To have more moment won't do harm, but having less shear than what to the case pertains risks brittle fractures that are better to avoid and so either you can rely in thin elements for your case or you better use thick ones to avoid this risk.
RE: thickened slab
I am designing a foundation on black expansive soil so Can any body out there who had some experience advise me on the finer aspects
RE: thickened slab
Practical Foundation Engineering Handbook
Robert Wade Brown editor
Mc Graw Hill
look at least section 3E but has more on it
There are various ways of addressing the thing. A slab stiff enough to tray the house atop is one solution. Cast concrete and (joint separated) perimetral pavements at almost the same time, this almost congeals the water content under the house and then the movement problems.
In any case one more favoured way of construction is use strong enough piles, and on them a set of parallel beams or a grid, waffle slab or slab, that for the most critical cases all but the piles must be neatly elevated from the ground, preferably creep space even registrable by a man.
The book is in any case a nice reference to have.