Sign convention and local axis for reduced results of walls

[Anonymous]

Hi,
I have read the sign convention for panels:

https://knowledge.autodesk.com/support/robot-structural-analysis-products/learn-explore/caas/CloudHe...

and meaning of NRx,TRy,....:

https://knowledge.autodesk.com/support/robot-structural-analysis-products/learn-explore/caas/CloudHe...

But for walls I don't understand what NRx, TRy,TRz...means.I am interested in the reduced result of a wall on an horizontal cut section.
1-is there a local axis for each section different from the local axis of the wall?
2-If we mean by NRx the normal force on the section,shouldn't it be negative for traction and positive for compression?in the second link the orientation of Nxx says that Nxx is positive for traction and so NRx is also,while in my model,under self weight I obtain positive values for NRx on the walls horizontal cut.

[Anonymous]

there was a problem in my modelisation, I corrected it and now I obtain NRx positive for traction which is right according to the links I putted.
1-But I still need to know which is the positive direction of the yy for each panel's horizontal cut.Am I able to see it's local axis? 
2-In the second link NRx and MRz sign convention is clear as Nxx is shown.but for other efforts like Nxy their direction is not given according to the local axis of the cut.So I don't know which Nxy,Mxx,Qxx is positive and by so the corresponding TRy,MRy,TRz.the directions of Nxy Mxx and Qxx are given in the first ling but reffering to the local axis of the panel,not the panel's cut.

[Artur.Kosakowski]

Hi @Anonymous

Please check the attached document.

If I managed to answer your question(s) press the Accept as Solution button please. This will help other users to find solution(s) much faster. Thank you.

[Anonymous]

@Artur.Kosakowski 
I had attached a screenshot for the simple model I have made to understand this.
In the case shown can you tell me what is the direction of yy on a horizontal cut for each wall, because as far as I understood the picture you attached, I still need to know which is A and which is B to get the direction of yy.
if A is the node with lower number than B,than there is problem because under the load case shown in my picture I get TRy negative for both walls while the directions concluded from node numbers of each wall are opposite to each other which means they should have opposite value of TRy(due to symmetry of the model)
If the local axis z of the panel is the same local axis z of the panel's horizontal cut(shown in the second picture I attached:methode of reduced force....)
then having a negative value of TRy for both wall is reasonable.But the problem is that MRz should be positive(according to methode of reduced force...(pic2) I am obtaining a negative value for both walls.I had concluded from this that MRz is in the opposite direction of that shown in the second picture and the local axis z of the cut is the same of the local axis z of the wall.
Am I right?
Thank you for your reply.

[Anonymous]

Is the local axe z of the horizontal cut(in the first attached pic) the same as the local axe z of the panel?
If not how do I know how it points? From what I understood from the picture you attached that I should know A,B,C,D for the panel to know how the vector yy points.
If yes, I had made two model to check it.in one I had obtained logical results and in the second I had obtained instability warning and illogical result.
The second picture shows the second model.I had obtained negative results for MRy,which is impossible because the moment should be creating tension in the positive side of z axis (local axis of the panel) which by definition of MRy in the links I had posted have positive value.
I thought that instability is the reason but I want to be sure because I am new in Robot,
Thank you for your reply.

[me1205377 · Accepted solution]

local z axis of the panel is the same as the local z of the cut 

[me1205377]

based on your last picture you have a cantilever wall with linear pin support 

which mean your wall can rotate in the direction of the applied force , this for sure is going to be a source of instability