compressiom member

negin · Post by **negin** » Tue Jan 30, 2007 7:28 am

Hi,

how can we define material properties of a compession member like as the figure bellow?

-------------------| force
-------------------|
-------------------|
-------------------|-----------------deformation
------------------/|
----------------/--|
---------\-----/---|
----------\---/----|
-----------\/------|

silvia · Post by **silvia** » Tue Jan 30, 2007 8:48 am

how about concrete with no tension?
you can use hysteretic, just don't make the tension size flat, use a very small slope.
also, you can use the elastic-no tension material in parallel with another material.

negin · Post by **negin** » Tue Jan 30, 2007 2:32 pm

Dear Silvia,
Thanks for your help, but this is a steel member so if we select elastic-no tension material, which other material could use to obtain the part of the diagram with negative slope?

silvia · Post by **silvia** » Tue Jan 30, 2007 8:18 pm

i'd go with my first recommendation of using the hysteretic material, with very shallow positive slope, almost zero.
i don't like the flat line at all, it leads to numerical problems big time!