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sandeep_nimbalkar SEFI Member
Joined: 26 Jan 2003 Posts: 3
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Posted: Fri Dec 30, 2005 11:05 am Post subject: Modelling of Soil |
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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
Joined: 26 Jan 2003 Posts: 25
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Posted: Sat Dec 31, 2005 4:44 am Post subject: Modelling of Soil |
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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
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prof.arc ...
Joined: 26 Jan 2003 Posts: 703
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Posted: Sat Dec 31, 2005 11:37 am Post subject: Modelling of Soil |
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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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