Curvature control

[wuhaoshrek]

Hi all,
I know there is load and displacement control in OpenSees, however I wanna know is I
can control the curvature on one specific section, such as incrementing the base section
deformation(curvature) to control the static analysis? Further more, use the very section
to control curvature rather use it as an integration point. Is it possible to be implemented?

Thanks.

[taneryilmaz]

In my opinion you can still use the displacement control but after relating displacement and curvature later explicitly. So that you can have the result at the curvature level you require. The critical thing here is that you should have enough steps to monitor (maybe more than needed).

[wuhaoshrek]

taneryilmaz wrote:
> In my opinion you can still use the displacement control but after relating
> displacement and curvature later explicitly. So that you can have the
> result at the curvature level you require. The critical thing here is that
> you should have enough steps to monitor (maybe more than needed).

Hi, thanks for response.

I see what you mean, but it is hard to relate local deformation with global displacement with a
simple relation in nonlinear range. Specifically, if I am gonna load the structure with increasing
base curvature, and use displacement control on the top node, the relationship between top disp.
and base curvature is complex, since disp. is Int. of curvature, and curvature nonlinearity varies
along the element length.