STRUCTURAL ENGINEERING FORUM OF INDIA [SEFI]

arunkumarjain11 · SEFI Member Joined: 26 Jan 2003 Posts: 2

It would depend whether you are estimating the pile capacity under compression or tension. It would be more appropriate to consider normal weight of pile if pile is under compression and buoyant weight if pile is under tension, especially when there is a possibility of fluctuation in the water table. However, if certain portion of pile always remains submerged, it would be appropriate to use buoyant weight of pile for the portion of pile, which always remains under water.

(A.K. Jain)

lele_raj[AT]yah... wrote:
hi virol,

it's very common to deduct unit weight of water in case of submerged footing. it's applied to all sorts of footings, not only piles. example: a "pad and chimney" type footing for a HV transmission tower where water table is likely to rise upto ground level.

Best regards,

Rajendra (Raj) Lele

P Please consider the environment before printing this e-mail or any attachment/s.

----- Original Message ----
Message From "nishithkshah[AT]yah..."
To: lele_raj[AT]yah...
Sent: Sunday, 9 September, 2007 11:14:18 PM
Subject: pile weight

hello ,viral

this is correct because ,any thing which is under water would have an upward force which we know has buoyancy .because the half the portion of pile is submerged there is force equal to that of water being pushed due to presence of pile , &will reduce the weight or self weight.

viralcivileng[AT]yah... wrote: Hi friends,
this is Viral.
I came across one problem.
Is there any logic to reduce the self weight of the portion of pile which is submerged?
I found in one design that they have calculated submerged weight of pile which is partly under water. I couldn't understand this logic. How this weight will be less than dry condition like that in soil? They had just subtracted unit weight of water from that of concrete and then calculated weight. Is this wright? If yes then why? If no then also why?

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