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Rigid End Zones, Offsets and Hinges

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Current Revision posted to RAM | STAAD Wiki by Seth Guthrie on 4/29/2021 8:10:34 PM
  
 Applies To 
  
 Product(s):RAM Elements
 Version(s):Any
 Environment: All
 Area: Analysis
  

When a member with a rigid offset includes an end release where is the hinge exactly?  

When a member is offset from its reference node, a rigid link is created between the original node which is unmodofied and the new member end position. The link is essentially a very stiff member with both ends fixed. If the member in Ram Elements is then hinged, the hinge occurs at the new end location of the member, before the rigid link.

Note, other Bentley Structural Analysis and Design products like STAAD.pro and RAM Structural System are similar in this regard.

Why are my members disconnected?

If you significantly offset physical members and then create new nodes along the length of the offset member, these points will not be recognized as being "along" the physical member and it will not be meshed to those points.

It is better to model the nodes in a single plane and then apply offsets, or cardinal point offsets, from this reference plane. Then things will mesh as expected.

See Also

RAM Frame - Rigid End Zone assumptions

Tags: Cardinal Points, RAM Elements, release, hinge, Offsets

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