Shell element

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behzad1980
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Location: Rice

Shell element

Post by behzad1980 »

Hi,

I want to know whether opensees recent released version can analyze nonlinear shell elements or not.

I've already modeled a bridge deck with shell MITC4 but the program can't converge but when I change shell elements to beam column elements, It works!!!

Could u please tell me if opensees has any problem in shell analysis or I made a mistake in their modeling.

Thanks
fmk
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Post by fmk »

if the beam-column model works stick with that.
suiwenwu
Posts: 4
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Location: University of Nevada, Reno,

Re: Shell element

Post by suiwenwu »

Do you mean that you use shellMITC4 to run the dynamic analysis? Does it have something wrong with the mass modeling?
fmk
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Re: Shell element

Post by fmk »

if, like the rest of the contiinuum elements, the materials at the gauss points have a density associated with them, the element will use them to form the mass matrix.
mohammadjjj
Posts: 7
Joined: Mon Feb 01, 2016 5:00 pm

Re: Shell element

Post by mohammadjjj »

Dear Users

I want to use ShellMITC4 as a pile cap, but after defining a shell element using four Peripheral nodes, the OSP doesn't show any shell element!!, it just shows an ordinary element between two early nodes among four nodes defined as peripheral nodes!!!
In addition, what does it mean with the command mentioned "input must be in counter-clockwise order around the element"!!
sb1966
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Re: Shell element

Post by sb1966 »

Hi,
it is reg your last question, about CCW node numbering. Assume that you have a 4 noded element whose nodes are 1 (LowerLeft), 2 (LowerRight), 3 (UpperRight) and 4(UpperLeft). Then you may write
element $eleType $eleTag 1 2 3 4
Alternatively you can also write
element $eleType $eleTag 2 3 4 1
But you can't write
element $eleType $eleTag 2 1 4 3 because now you are numbering the nodes in CW fashion.
Hope this helps.
----------------------------------
With Regards,
sb1966
hamiddehnavi
Posts: 5
Joined: Tue May 31, 2016 10:39 pm
Location: Tehran

Re: Shell element

Post by hamiddehnavi »

i can't get localforce response of this element...but it get me just force...can you help me?
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