How to model a friction?

[huoyili]

Hi Frank & Silvia,

I am trying to model the friction between two objects, and here they are soil and wall now. I think I may need a nDMaterial and correponding zeroLength element, by which the force in the directions alongwith the friction surface should be proportional to the pressure force in the direction vertical to the surface. The concept is pretty simple, as F=mu*N. Is there such a material and element?

If there is no such element, I am thinking of a substituted idea. As I am doing time-history analysis, I may manually change the friction force based on the last step sloved pressure force, i.e. changing the material during time history analysis. Do you think it is feasible for OpenSees to support that change and continue the analysis?

Thank you very much.

Yili Huo From UCLA

[fmk]

there is some friction bearing elements you might be able to use that are in source code repository and will be in the next release of OpenSees. the code can be found here:
[url]
http://opensees.berkeley.edu/cgi-bin/cv ... onBearing/
[/url]

[huoyili]

just when is the next release scheduled for publish?

[zvidrih]

You can also try using one of the ZeroLengthContact elements:

[url]
http://opensees.berkeley.edu/OpenSees/m ... l/4139.htm
[/url]
[url]
http://opensees.berkeley.edu/cgi-bin/cv ... eroLength/
[/url]