I am trying to model the impact element having non linear stiffness in Abaqus. I want to model the pounding force between two frames under earthquake excitation. For this I am using Axial connecter element and defined elastic behavior and reference length equal to gap. Under elastic behavior I have input the table of Force vs Relative displacement in such a way that force is zero in tension and remains zero until gap closes. But after running the analysis my pounding force value is comming less than expected.
My whole objective is to model the gap element and it should work in a way that when two frames collide, the gap element becomes active else it should transfer no force?
Please somebody tell me where I am doing wrong or if there is another way of modelling gap in abaqus?
Thanks in advance.
Gap element library will help you:
https://abaqus-docs.mit.edu/2017/English/SIMACAEITNRefMap/simaitn-r-gaplibrary.htm
From Abaqus Users Guide I got to know that Abaqus does not allow the direct use of gap element instead it suggests to use suitable connecter element instead of GAPUNI element.
Why you want to model gap by an element. It seams you want to consider a contact behaviour? If it is, Abaqus has various contact elements and behaviour including traction separation that can be defined between two separated surfaces and act when the surfaces toch each other.
Thanks for your reply Ali Ehsan Seif . From where can I get these contact elements, I mean which module?
Also, For clarification I want to mention that I want to model the gap between two RC frames by a spring having certain stiffness and gap in such a way that this spring becomes active only when two frames collide and remain inactive otherwise (i.e. in tension or when gap is open).
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