Local centroid of a fiber section

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Jfoyian
Posts: 22
Joined: Wed Apr 15, 2009 2:42 pm

Local centroid of a fiber section

Post by Jfoyian »

Dear Vesna,

Could you please explain how OpenSees creates the element out of a fiber section? Does it automatically locate the element node at the geometric centroid of the cross-section no matter how the cross-section is defined? I am getting the same results when I define the origin of the local coordinate system at the edge of the wall, at the geometric centroid, or at an arbitrary point. I would expect the axial load remain the same for these three cases but the moment capacity be totally different. I am very confused. Thanks for your help.
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vesna
Posts: 3033
Joined: Tue May 23, 2006 11:23 am
Location: UC Berkeley

Re: Local centroid of a fiber section

Post by vesna »

The element node is located at the origin of the local coordinate system. This means that you apply load at that node.

Can you explain me your model in more detail (type of element, load applied on it, recorders)?
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