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[bysaniam]

Blankdear sefians
, does any one can help in designing the raft-foundation for
4 legs of tower were one leg is critical in uplift and the other is leg in compression.
were most of the books referred to only compression ,
does any one have designed a raft to take care of uplift as well as compression.
any material on this his highly appreciated.(excel ,sheets)
B.Aravind Kumar PGET
KEC-International Ltd
Mumbai
9890092094

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[gsrinivasbabu]

Design of raft for a tower can be done as usual normal raft
foundation,But is to be checked for Ceck for 1) Over turning 2)Down thrust
3)Punching shear Check against overturning plays key role in the design of
raft foundation for a tower. Tocheck for OT First calculate the overturning
moment whch can be obtained by multiplying the base width of the tower with
twice the down thrust. Then calculate the Stabilizing moment Stabilizing
moment= W*B/2 Where w=weight of soil above raft+weght of concrete including
self weight of raft B= base width of foundation FOS =Stabizing moment 7
Overturning moment and must be greaster then 1.5 Checking don thrust can be
done by calculating P/A*M/Z of the raft and this value must be less
then SBC depth
从冲剪计算垫可以计算lations as usal. Generally
we get minimum steel in in pad in both the direction at top and bottom. Columns
can be designed with help of SP16 charts as biaxial members(Tension+
bending) I think it is sufficient for you.
Any clarifications pls dont hesitatae to ask me
G.Srinivas Babu
Senior designer
Towers wing
SVPCPL
Hyderabad

On Mon Dec 4 15:32:52 2006, bysaniam[AT]kec... wrote: