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Whether the local CID rotates with the CBush elemen?
For CBUSH, I think not. I think CBUSH is not geometric non-linear.
For CBUSH1D, I think yes, IF the coordinate system is a moving system (CORD3R).
From OptiStruct Help for CBUSH1D (with my [ ]s):
"...If CID > 0, the x-axis of CID is the element axis. In geometric nonlinear analysis, depending on the referenced system being movable [CORD3R] or fixed [e.g., CORD2R], the axis of the element will move or not move with the axes of the system, respectively..."
For CBUSH, I think not. I think CBUSH is not geometric non-linear. For CBUSH1D, I think yes, IF the coordinate system is a moving system (CORD3R). From OptiStruct Help for CBUSH1D (with my [ ]s): "...If CID > 0, the x-axis of CID is the element axis. In geometric nonlinear analysis, depending on the referenced system being movable [CORD3R] or fixed [e.g., CORD2R], the axis of the element will move or not move with the axes of the system, respectively..."
from the same CBUSH1D documentation, it's said: "Geometric nonlinear analysis is selected by an ANALYSIS = EXPDYN subcase entry."
From my experience, the usage of this movable coordinate systems are only allowed to EXPDYN loadcases, which essentially converts your model to RADIOSS and perform an Explicit analysis there, allowing a movable frame.
Unfortunately, i don't think OS currently supports a movable CID itself.
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