large displacement large strain

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abira
Posts: 26
Joined: Mon Feb 03, 2020 10:26 pm

large displacement large strain

Post by abira » Wed Feb 17, 2021 10:08 pm

Dear all,
Is it possible to perform a large displacement large strain non-linear analysis in OpenSEES? The co-rotational transformation as mentioned in the documentation is based on large displacement-small strain formulation.

Thanks
Abira

Ashok
Posts: 50
Joined: Tue Feb 19, 2019 8:59 pm
Location: IITM

Re: large displacement large strain

Post by Ashok » Tue Mar 02, 2021 9:21 pm

Can you include that effect in your material model ?
As far as my understanding goes with OpenSees - it is strong in material modelling. So when using OpenSees always think - can I convert this phenomenon into a material model..? At least I tend to think like that - personally.

abira
Posts: 26
Joined: Mon Feb 03, 2020 10:26 pm

Re: large displacement large strain

Post by abira » Thu Mar 04, 2021 2:52 am

Thanks Ashok for your reply. I have not thought of including geometric non-linearity into my material model. Can you suggest of some simple examples to begin with or refer to a some problem in which the effects of geometric non-linearity has been taken into account in the material model itself.

thanks Again
Abira

mhscott
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Location: Corvallis, Oregon USA
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Re: large displacement large strain

Post by mhscott » Thu Mar 04, 2021 6:32 am

An easy way to do both material and geometric nonlinear with frame elements is to use a "corotational mesh": https://wp.me/pbejzW-Bh

abira
Posts: 26
Joined: Mon Feb 03, 2020 10:26 pm

Re: large displacement large strain

Post by abira » Thu Mar 04, 2021 7:16 pm

Thank you Prof. for your answer. I'll check out the post.

abira
Posts: 26
Joined: Mon Feb 03, 2020 10:26 pm

Re: large displacement large strain

Post by abira » Fri Mar 05, 2021 1:36 am

mhscott wrote:
Thu Mar 04, 2021 6:32 am
An easy way to do both material and geometric nonlinear with frame elements is to use a "corotational mesh": https://wp.me/pbejzW-Bh
Sir, I read your post. I just wanted to ask that when you say co-rotational mesh, do you mean using multiple non-linear frame elements(force/displacement based) with geometric non-linearity set as co-rotational. Am I interpreting it correctly?

Thanks
Abira

mhscott
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Location: Corvallis, Oregon USA
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Re: large displacement large strain

Post by mhscott » Mon Mar 08, 2021 6:06 am

Yes

abira
Posts: 26
Joined: Mon Feb 03, 2020 10:26 pm

Re: large displacement large strain

Post by abira » Wed Mar 10, 2021 9:59 pm

Thank you Prof.

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