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Modelling of Soil

 
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 2005
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sandeep_nimbalkar
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Joined: 26 Jan 2003
Posts: 3

PostPosted: Fri Dec 30, 2005 11:05 am    Post subject: Modelling of Soil Reply with quote

 
Dear all
i am sandeep Nimbalkar doing my dissertation on "Effect of Soil

Structure Interaction on High Rise Building founded on Soft Soil

subject to Seismic Forces" I want to model the founding soil. We have

SAP 2000 and STAAD 2004 available in our college. Is any one of you

have idea @ How to model the founding soil & how to define its Dynamic

Properties in Software.

ThankYou

Sandeep Nimbalkar
M. E. (Structures)
Mobile: 9422547167

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rsm
SEFI Regulars
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Joined: 26 Jan 2003
Posts: 25

PostPosted: Sat Dec 31, 2005 4:44 am    Post subject: Modelling of Soil Reply with quote

Dear Sandeep:

You can either user soil springs to model Winkler type foundation or else
you can also use 3DSOLID elements to model soil.

Hemant Kr
----- Original Message -----
Message From  <sandeep_nimbalkar[AT]red...>
To: <rsm[AT]tou...>
Sent: Friday, December 30, 2005 4:35 PM
Subject: @ Modelling of Soil

Quote:

Dear all
i am sandeep Nimbalkar doing my dissertation on "Effect of Soil

Structure Interaction on High Rise Building founded on Soft Soil

subject to Seismic Forces" I want to model the founding soil. We have

SAP 2000 and STAAD 2004 available in our college. Is any one of you

have idea @ How to model the founding soil & how to define its Dynamic

Properties in Software.

ThankYou

Sandeep Nimbalkar
M. E. (Structures)
Mobile: 9422547167


Posted via Email
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prof.arc
...
...


Joined: 26 Jan 2003
Posts: 703

PostPosted: Sat Dec 31, 2005 11:37 am    Post subject: Modelling of Soil Reply with quote

Dear Mr. Sandeep Nimbalkar,
The actual problem is too complicated.
However, in practice the soil is sometimes replaced by a set of
springs - springs in all 6 DOF if you are modelling the superstructure
by beam elements.
The expressions used are based on studies on Machine Foundations.
If you are in Mumbai, the BARC and IIT-Bombay libraries have excellant
publications on Soil Structure Interaction.
Not only soil springs but soil damping is also to be considered and
modal damping must be derived. It is not an easy problem even with
gross assumptions of soil as spring-dashpot system. There is a
controversy associated with how much soil mass to be lumped or not.
Just blindly using packaged software, will lead you nowhere. You must
read literature and note the assumptions.
This is not to discourage you but to inform you that if you are doing
research, you must readw what has been attempted so far.
On the contray, if you are designing, anything goes. There is a draft
Code [may be already finalised] on industrial structures which you may
use for design but not for research.
Sincerely
Prof. ARC

Quote:
On Fri Dec 30 16:35:16 2005, sandeep_nimbalkar[AT]red... wrote:


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