
why on vertical member the moment is calculated on Y axis while for nonvertical the moment is chaining across the Z axis? can you please fix this ?
for example in example 2 the MY component of internal force is represent the bending moment but when it comes to the vertical member the MZ is the answer.



Are you sure that is a bug?
That is because of local coordination system on elements. You should convert the force, from local to global system (there is method for it on frame element) and see the problem still remains? Please let me know the result. I also will try to do that...
Thanks



I discovered when the nodes are slightly off the plane the coordinate system of elements flips . for example when I draw elements in ZX plane if the Y coordinate is not exactly zero , this error occurs. I'm experiencing this problem because I import information
from CAD software and I receive coordinates like [X:1,Y:0.000001,Z:6] instead of [1,0,6]. I'm using Math.Round (double,int) to round the inputs and avoid this problem. I was wondering if there is a better solution than rounding figures?!



Thanks for details.
In your example, do you mean that if there be a little different Y of both ends, then local coordination system is totally different with case that there be same Y for both ends?



epsi1on wrote:
Thanks for details. In your example, do you mean that if there be a little different Y of both ends, then local coordination system is totally different with case that there be same Y for both ends?
Yes, exactly!



That is because the formulation used for defining the local system and i think cannot be changed.
But there is a WebRotation property on FrameElement2Node that maybe help you.
Thanks



If I run the model with a single beam and a uniform load ( 1 kn along the global Z) I get negative bending moment in the middle. is this also a problem of local coordinate system ? What need to be changed in code to get positive bending moment in the
middle of beam?



Is the negative value exactly same amount as positive value you do expect?



very close but not exactly, I'm experiencing some issues in regard to beam stress calculation. do you have time for a quick chat?



Can you tell me approximately how many percent is different at most?
About chat, it is ok. but I rather chat over discussion forum here (on codeplex) if it is OK for you, as the chat can be probably helpful for other users.
Regards

