Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
(OP)
Hi guys!
I have a problem about the beam I am analyzing. I should do a nonlinear analysis, but there are always warnings and all the displacements are zero. So I thought I did a linear static analysis first to see what went wrong. And this warning came, the Node force/moment component at node 1 is ignored, node 1 is where the force is applied. And the displacements are all zero. The horizontal beam was simply supported, to the right there is a vertical beam connected to the horizontal beam with both ends fixed.
Can anyone tell me how to fix this problem please?
Many thanks.
I have a problem about the beam I am analyzing. I should do a nonlinear analysis, but there are always warnings and all the displacements are zero. So I thought I did a linear static analysis first to see what went wrong. And this warning came, the Node force/moment component at node 1 is ignored, node 1 is where the force is applied. And the displacements are all zero. The horizontal beam was simply supported, to the right there is a vertical beam connected to the horizontal beam with both ends fixed.
Can anyone tell me how to fix this problem please?
Many thanks.





RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
At the moment all I can suggest is checking that your global freedom conditions are OK, and that the applied load(s) are not applied at a restrained node.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
If so any load applied at Node 1 will go straight into the support, and will not affect the rest of the structure, which is what your analysis found.
To get some load into the structure either apply the load at one of the unrestrained nodes, apply a moment at Node 1, or remove one or more restraints at Node 1.
It just depends what you are trying to model.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
To view the other increments open the results file and click on the increment dropdown box in the top-left corner.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
Can I ask another question if it is not bothering you
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
In general you should only be applying restraints in the model if the actual structure has something preventing movement (or rotation) in that direction.
If you are looking for buckling loads the vertical restraint you have at node 1 will make a big difference. Is the actual structure restrained vertically at that point?
Also does the other end of the horizontal beam have restraints other than the two vertical beams?
Are the top and bottom of the vertical beams effectively restrained against rotation, or just in position?
Regarding the stress-strain table, if your beam is still in the elastic range when it reaches its buckling load then you don't need a stress-strain table, but if the stress anywhere is approaching yield you will need it. The simplest thing to do is to do a run with and without (making sure that non-linear material is enabled), and see if it makes a difference.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
Thanks again, I have been learned a lot from you.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
The easiest way is to subdivide the beam so you have a node wherever you want deflections.
Alternatively, open the results and either:
Click on the results settings icon (multicoulered icon)
Set number of slices to an odd number
Open result listings
Click beam tab
Select "Beam Stations" from the View drop-down box
You will now have displacements listed at points along each beam, including the mid point.
Or
Click the "peek" icon (microscope)
Click the beam tab
Set slices to 3
Select displacements
You will now get displacements at each end and the mid-point when you click on any beam.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.
You can create separate freedom cases with different node deflections (see the Global menu).
To gradually increase the deflection run a non-linear static analysis, create as many load increments as you need and apply factors to the Freedom Case.
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Strand 7. Simple case with the warning of Node force/moment component at node X is ignored.