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raft-foundation

 
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bysaniam
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 11

PostPosted: Mon Dec 04, 2006 10:02 am    Post subject: raft-foundation Reply with quote

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
SEFI Member
SEFI Member


Joined: 26 Jan 2003
Posts: 8

PostPosted: Mon Dec 04, 2006 2:08 pm    Post subject: raft-foundation Reply with quote

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
of pad can be calculated from Punching shear calculations 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... <bysaniam[AT]kec...> wrote:
Quote:

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

This e-mail was scanned for viruses using BitDefender
Sent by 602LAN SUITE - http://www.software602.com/

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