Hi dear sir/madame,
I just only wanna create a rigid element between two points which do not deform at all. I tried to create a normal elasticbeamcolumn element type and assign a very big value for the modulus of elasticity. However, it doesn't work (or at least It comes to me so) and I receive very strange results (such as 7e+6 for rotations!!!!)
Then I tried to create this rigid element by using GeolTrans function by assigning joint offsets at the ends such that all element length is covered. however this gives me the same odd results.
Is there any other standard way to define a rigid member or maybe the ways that I used which is trust-able?
My problem can take place due to other parts of my model. However I am not sure about this rigid link. If I will be sure about this element then I will go and search other parts of my model code.
How to Create a rigid element.
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mghaffarinia
- Posts: 5
- Joined: Mon Oct 17, 2011 4:54 am
- Location: METU
Re: How to Create a rigid element.
There is a “rigidLink” command:
http://opensees.berkeley.edu/wiki/index ... nk_command
Hope that helps!
http://opensees.berkeley.edu/wiki/index ... nk_command
Hope that helps!
Re: How to Create a rigid element.
If this rigid element connects to nonlinear beam-column elements such as forceBeamColumn and displacmenetBeamColumn your approach with modeling it using very stiff elastic element seems right to me. Otherwise, rigid link can be used as well.
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wuhaoshrek
- Posts: 122
- Joined: Tue Oct 28, 2008 4:01 am
Re: How to Create a rigid element.
vesna wrote:
> If this rigid element connects to nonlinear beam-column elements such as
> forceBeamColumn and displacmenetBeamColumn your approach with modeling it
> using very stiff elastic element seems right to me. Otherwise, rigid link
> can be used as well.
vesna,
but using stiff elastic element might make period of the model unrealistic, right? would rigidLink change period of the model also? thx
> If this rigid element connects to nonlinear beam-column elements such as
> forceBeamColumn and displacmenetBeamColumn your approach with modeling it
> using very stiff elastic element seems right to me. Otherwise, rigid link
> can be used as well.
vesna,
but using stiff elastic element might make period of the model unrealistic, right? would rigidLink change period of the model also? thx
-
wuhaoshrek
- Posts: 122
- Joined: Tue Oct 28, 2008 4:01 am
Re: How to Create a rigid element.
mghaffarinia wrote:
> Hi dear sir/madame,
> I just only wanna create a rigid element between two points which do not
> deform at all. I tried to create a normal elasticbeamcolumn element type
> and assign a very big value for the modulus of elasticity. However, it
> doesn't work (or at least It comes to me so) and I receive very strange
> results (such as 7e+6 for rotations!!!!)
> Then I tried to create this rigid element by using GeolTrans function by
> assigning joint offsets at the ends such that all element length is
> covered. however this gives me the same odd results.
> Is there any other standard way to define a rigid member or maybe the ways
> that I used which is trust-able?
>
> My problem can take place due to other parts of my model. However I am not
> sure about this rigid link. If I will be sure about this element then I
> will go and search other parts of my model code.
Hi, I used rigdLink. I think the thing you want it for rigid can be interpreted as the distance between the two nodes
would not change at all during the analysis. I used rigidLink, and checked the distance for that. I found the distance
is pretty good, although it may not as accurate, in terms of the digit number. This could give you almost the same
outcome as using a very stiff elastic element. Have you got any updated solution so far?
> Hi dear sir/madame,
> I just only wanna create a rigid element between two points which do not
> deform at all. I tried to create a normal elasticbeamcolumn element type
> and assign a very big value for the modulus of elasticity. However, it
> doesn't work (or at least It comes to me so) and I receive very strange
> results (such as 7e+6 for rotations!!!!)
> Then I tried to create this rigid element by using GeolTrans function by
> assigning joint offsets at the ends such that all element length is
> covered. however this gives me the same odd results.
> Is there any other standard way to define a rigid member or maybe the ways
> that I used which is trust-able?
>
> My problem can take place due to other parts of my model. However I am not
> sure about this rigid link. If I will be sure about this element then I
> will go and search other parts of my model code.
Hi, I used rigdLink. I think the thing you want it for rigid can be interpreted as the distance between the two nodes
would not change at all during the analysis. I used rigidLink, and checked the distance for that. I found the distance
is pretty good, although it may not as accurate, in terms of the digit number. This could give you almost the same
outcome as using a very stiff elastic element. Have you got any updated solution so far?