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column foundation joint

 
This forum is locked: you cannot post, reply to, or edit topics.This topic is locked: you cannot edit posts or make replies.    www.sefindia.org Forum Index -> Past Discussions Year 2004
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kirtesh_gandhi at hotm...
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PostPosted: Tue Aug 17, 2004 8:22 am    Post subject: column foundation joint Reply with quote

Dear Mr. Barua,

The fixed base footing means that all its rotations are prevented which
further cause moments at the base.  The rotation required to reduce the
fixed base moment to zero is much smaller than that may occur when normal
settlement takes place in the subgrade.  It is very difficult to predict the
behaviour of subgrade and its effect upon the restraint at the base hence it
is more reasonable and safer to assume the base is hinged than fixed.
But the joint can be considered as fixed or partially fixed in rocky strata
or if better understanding of soil strata is available.
Hope it helps.

Regards,
Kirtesh Gandhi
(Dalal Mott MacDonald)



[quote]Message From  <ibarua@deguild.com>
Reply-To: <general@sefindia.org>
To: <kirtesh_gandhi@hotmail.com>
Subject: Daily Digest Wed Aug 11 23:00:02 2004
Date: Sun, 15 Aug 2004 08:33:19 +0530


15 August, 2004

I do not understand what is meant by 'even
the slightest rotation destroys the moment'. I do not think that the
column-foundation joint can be considered as pinned.

Indrajit Barua.

On Wed, 11 Aug 2004 general@sefindia.org wrote :
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mc.upadhyay1
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Joined: 26 Jan 2003
Posts: 134

PostPosted: Tue Aug 17, 2004 10:35 am    Post subject: column foundation joint Reply with quote

Hello
Assuming the column base as pinned is O.K.
but it will increase the time period of the structure thus
reducing the seismic forces.

Regards
Mukesh Upadhyay




kirtesh_gandhi@h                                                                                                
otmail.com               To:      mc.upadhyay@jil.co.in                                                          
cc:                                                                                    
08/17/04 01:43           Subject: column foundation joint                          
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Dear Mr. Barua,

The fixed base footing means that all its rotations are prevented which
further cause moments at the base.  The rotation required to reduce the
fixed base moment to zero is much smaller than that may occur when normal
settlement takes place in the subgrade.  It is very difficult to predict
the
behaviour of subgrade and its effect upon the restraint at the base hence
it
is more reasonable and safer to assume the base is hinged than fixed.
But the joint can be considered as fixed or partially fixed in rocky strata

or if better understanding of soil strata is available.
Hope it helps.

Regards,
Kirtesh Gandhi
(Dalal Mott MacDonald)

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roark.sol1
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Joined: 26 Jan 2003
Posts: 70

PostPosted: Tue Aug 17, 2004 3:36 pm    Post subject: column foundation joint Reply with quote

How would it matter, as the codal values anyway have an upper bound (approx
half the value obtained dynamically) for the time period !!

Regards

Pankaj

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