Zero length elements with shear-axial interaction

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giovannimilan
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Location: ARUP, amsterdam

Zero length elements with shear-axial interaction

Post by giovannimilan » Mon May 29, 2017 7:04 am

Hi all,

Is there anyone who attempted to create within a frame model, zero length translational and rotational springs in which the F-d (or M-rot) relationship depends on the axial load of the beam elements?

For instance, I am thinking about a moment frame with concentrated plasticity, in which the hinges behavior is updated during the analysis, depending on the axial load of the columns.

Cheers,

selimgunay
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Location: University of California, Berkeley

Re: Zero length elements with shear-axial interaction

Post by selimgunay » Mon May 29, 2017 9:22 am

We have previously developed a shear spring that considers the shear capacity-axial force interaction according to the Caltrans SDC and ACI318 equations. You can find the details in Chapter 6.2 of the report below. Please let me know if you have any questions.

http://peer.berkeley.edu/publications/p ... osalam.pdf

giovannimilan
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Location: ARUP, amsterdam

Re: Zero length elements with shear-axial interaction

Post by giovannimilan » Tue May 30, 2017 2:42 am

selimgunay wrote:
> We have previously developed a shear spring that considers the shear
> capacity-axial force interaction according to the Caltrans SDC and ACI318
> equations. You can find the details in Chapter 6.2 of the report below.
> Please let me know if you have any questions.
>
>
> http://peer.berkeley.edu/publications/p ... osalam.pdf

Hi,

Thanks for the prompt reply.

I ve understood the yielding force updating before yielding.

However, I am thinking, is it a zeroLength in 2 directions in which you are actually reading the axial dof (elastic material for instance) and using it for updating the transversal dof properties(inelastic constitutive law material)?

or is it still only the trasversal dof (shear, no axial) but it is able to read in the force from the adjacent beam element for instance?

selimgunay
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Location: University of California, Berkeley

Re: Zero length elements with shear-axial interaction

Post by selimgunay » Tue May 30, 2017 5:53 pm

It is the latter one, i.e. the trasversal dof and it gets the axial force from column that it is connected. The connected column info is provided as input.

giovannimilan
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Location: ARUP, amsterdam

Re: Zero length elements with shear-axial interaction

Post by giovannimilan » Wed May 31, 2017 1:34 am

selimgunay wrote:
> It is the latter one, i.e. the trasversal dof and it gets the axial force
> from column that it is connected. The connected column info is provided as
> input.

Thanks.

I am assuming the equations are uncoupled in the vertical and the horizontal directions (since the spring does not provide entries in the matrix which are related to the vertical dof's). Hence, one is able to solve it first vertically to get the axial force and use this one to update the "horizontal" equation. Otherwise, I may think that is possible to use the axial force from the previous time step (as long as the time-step is sufficiently small).

Which do you reckon is more efficient?

I am working on my master thesis about masonry structures and representing the masonry piers behavior with ASCE 41-13 shear capacity (depending on axial load). Could you please provide a workflow example for the material model?

TPdct
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Location: Dalian University of Technology

Re: Zero length elements with shear-axial interaction

Post by TPdct » Wed May 31, 2017 2:24 am

Do you have the source code of your proposed shear-axial interaction element (or material)?

selimgunay
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Location: University of California, Berkeley

Re: Zero length elements with shear-axial interaction

Post by selimgunay » Wed May 31, 2017 2:45 am

Yes I have it. I will look for it and let you know.

giovannimilan
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Re: Zero length elements with shear-axial interaction

Post by giovannimilan » Wed May 31, 2017 4:53 am

selimgunay wrote:
> Yes I have it. I will look for it and let you know.

It would be great.

Cheers,

TPdct
Posts: 43
Joined: Thu Jan 21, 2016 5:51 am
Location: Dalian University of Technology

Re: Zero length elements with shear-axial interaction

Post by TPdct » Wed May 31, 2017 7:07 am

My Email: dct328@163.com

giovannimilan
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Location: ARUP, amsterdam

Re: Zero length elements with shear-axial interaction

Post by giovannimilan » Mon Jun 05, 2017 3:17 am

selimgunay wrote:
> Yes I have it. I will look for it and let you know.

hello,

have you found the reference source code?

Cheers,

selimgunay
Posts: 889
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: Zero length elements with shear-axial interaction

Post by selimgunay » Mon Jun 05, 2017 11:13 pm

I will send it to you within few days. Could you tell me your email address?

giovannimilan
Posts: 71
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Location: ARUP, amsterdam

Re: Zero length elements with shear-axial interaction

Post by giovannimilan » Mon Jun 05, 2017 11:25 pm

selimgunay wrote:
> I will send it to you within few days. Could you tell me your email
> address?

It is: giovanni1.milan@gmail.com

Thank you.

basdekmara
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Location: University of Patras

Re: Zero length elements with shear-axial interaction

Post by basdekmara » Wed Jun 28, 2017 1:45 am

Hi everyone,

does anyone have the source code of shear-axial interaction in a zero length element?

Thank you.

selimgunay
Posts: 889
Joined: Mon Sep 09, 2013 8:50 pm
Location: University of California, Berkeley

Re: Zero length elements with shear-axial interaction

Post by selimgunay » Thu Jun 29, 2017 1:13 pm

Please indicate your contact email. I will send it to interested people soon.

TPdct
Posts: 43
Joined: Thu Jan 21, 2016 5:51 am
Location: Dalian University of Technology

Re: Zero length elements with shear-axial interaction

Post by TPdct » Thu Jun 29, 2017 5:50 pm


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