Posted by: Ross Sinclair
C2 Load Case Methods - 06/18/02 07:59 PM
I would like to get some clarification on methods that C2 uses to combine elements for load cases.
The Alegebraic method is self explanatory.
However I am confused by the Scalar method. To quote the UGNow as all of these items are vector quantities, how does C2 combine them using the Scalar method? Does it add the magnitudes of the vectors (e.g. a displacement of 1,1,1 with resultant of 1.732, plus a displacement of -1,-1,-1 with resultant of 1.732 would give 3.464)?
Or does it add the magnitudes of the individual components (which would then be the same as a vector addition)?
If we take this further and apply it to a typical situation where we are determining stresses under an occasional load case - see L10 & L11 in the C2 viewlet on load cases - Scalar is recommended as the combination method. In these two load cases the output is only stress. Does this mean that C2 only looks at the stresses from the contributing load cases, and then combines these using the scalar method? In other words, where stress is specified, C2 does not carry out any combination operations on displacements, forces, moments etc.
The Alegebraic method is self explanatory.
However I am confused by the Scalar method. To quote the UG
Quote:
"This method combines the displacements, forces, moments, restraint loads, and stresses of the designated load cases in a Scalar manner (i.e. not as vectors, but retaining consideration of sign)."
Or does it add the magnitudes of the individual components (which would then be the same as a vector addition)?
If we take this further and apply it to a typical situation where we are determining stresses under an occasional load case - see L10 & L11 in the C2 viewlet on load cases - Scalar is recommended as the combination method. In these two load cases the output is only stress. Does this mean that C2 only looks at the stresses from the contributing load cases, and then combines these using the scalar method? In other words, where stress is specified, C2 does not carry out any combination operations on displacements, forces, moments etc.