Friction supports

[Anonymous]

Hi all,

I have been trying run a simple example using friction supports to implement the procedure in a more technical model.

This has lead me to a few questions which need answering:

1. What is the purpose of giving the friction support dimensions when the selecting the node option in the advanced tab?
2. If the self weight of the wall is 735.9kN and the friction coefficient used is 0.6 the total lateral resistance should be 441.54kN. This indicates that the wall should not slide under the application of a lateral load of 441.5kN applied close to the supports as to prevent any overturning moments and uplft. During the calculations for a lateral load of 440kN type 3 instabilities are generated followed by non-convergence (the lateral load has been combined with selfweight). Why is this? I have attached the model below.
3. How is inadequate frictional resistance illustrated by Robot?

Regards

Dane

[t.sautierr]

Area of support = no utility

Works fine with a looser mesh (ok with 1m and mi = 0.65) -> Because with less supports it attracs more vertical loads and then the friction works better.

I think what happened in your previious model : at some small point : small value then small friction then starting of movement but mayb 1m ahead no movement -> no convergence.

[Anonymous]

Seems strange that to get the frictional supports to work on would have to use a course mesh. 

This would bring to question the functionality of the support condition?