Coul you please help me
I have a shaft for elevator
I want to do an analysis FEM with beam elements.
The difficulty I have is that the centroids are not match
add pictures
Than you
One way to do it would be like this:
After you analyze your beam model (or even before!), you may want to create a plate model of one of the joints, and (manually) apply the forces from the beam model to the ends of the sections in the plate model. (See attached image.) My concern is that the "flanges" of the columns will flex the open cross-section and allow some relatively independent rotation of the beams. The beam element model will not include this type of effect.
Can you explain how to go about extracting the forces and moments for a cross-section after running a simulation?
"Results Contours > Other Results > Element Forces" and then get the 6 results at each point from the commands on the "Results Inquire" tab.
Thanks John
I have an additional questions
I have analysed the model with beam elements. I have used beam elements, beam elements with large stiffness and end release.
I have extracted the forces and moments of the baeam analysis
I have analysed one of the critical joints with this forces aplly on the end of the plate analysis.
How can apply boundary condictions on the joint analisys (plate elements)? the model is free to move
Axial force result on the node with (-) sign is compression forces?
add pictures and file
thanks
Hi jjohnson,
The forces and moments on the sub-model should be in balance, theoretically. That is, sum of foces in X = 0, sum of foces in Y = 0, up through sum of moments about Z = 0. Therefore, you can apply some constraints almost anywhere to take up any imbalance in the applied loads.
Regarding the directions of the load, you will need to read the section "Element Forces and Moments" on this page in the Help documentation: Linear Results Menu.
Good morning John
I have obtained excellent results with beam model. them are logical results.
I have problem with sub-model
I have used the nodes 1398, 1597 anf 56 for transfer forces to the sub-model
The forces and moments on the sub-model are in balance
I have used nodal rigid boundaries on the sub-model fixed in X, Y and Z with 20 N/mm for the stifness
John, why the deformations are so high? I have any error in the submodel?
add files model and sub-model
Thanks
Hmm. That's a good question. I will need to study it to see if I see anything wrong.
In the mean time, is the plate model displacing in the same direction as the beam model? I suspect that interpretting the direction of the force and moment results from the beam model is not straight forward, so applying them to the plate model with the proper sign or direction could be tricky. If the plate model is not deflecting like the beam model, that could help diagnose the problem.
Thank you John
I have the following interpretation about the local sign convection for the beam elements
Add picture and original model