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Re: Unwanted Loads/Moments showing up with Load Case Manager results
Mats Lindqvist Sep 27, 2018 10:09 AM (in response to Thomas Webb)I have a similar problem.I define two "remote loads" relative to a user defined coordinate system. The loads are applied to the same point, are equal in magnitude, act in 180degrees opposite direction, but are transferred to different surfaces. It is essentially a "pinching" function, that push surfaces apart in the structure, so the forces are equal in magnitude, acting along the same axis, at the same reference point, but with opposite direction.
My understanding is that the "remote load" functionality, should allow you to specify a load with a well-defined resultant with respect to a point, but transferred to a specified surface.
The way I have defined this, this should not introduce any global resulting forces/moments acting on the structure, since the two load are in equilibrium, and cancel each other out. But my results suggests that I do get resulting reaction forces. I get high stresses near fixtures, if I constrain the model using a flexible "elastic support", I get significant rigid body rotation. When I run the model without fixtures and "intertial relief", I get a warning message that there is significant external imbalance forces.
I too run SW2017.
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Re: Unwanted Loads/Moments showing up with Load Case Manager results
Bill McEachern Sep 27, 2018 10:18 AM (in response to Mats Lindqvist)load case manager is relatively new and it is buyer beware for anything new historically - it may have issues. Further the remote load function has had problems since about 2007 - it gets fixed then it breaks then it gets fixed - particularly true in NL studies.
To really be sure about this you could post an image of the load application point and how the remote load appears. I take it you are using the direct transfer option?
Also, using and NL analysis helps due to the equilibrium iteration help to settle out noisy residuals which can't be resolved in a linear analysis.
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Re: Unwanted Loads/Moments showing up with Load Case Manager results
Mats Lindqvist Sep 28, 2018 3:13 AM (in response to Mats Lindqvist)I think I have found a workaround. It seems that if the target surfaces are planar or cylindrical, then it works fine, but if they are conical, then it doesn't work.
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