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CAST does not allow you to remove the Outer Boundary once you
create it because the Outer Boundary plays a unique role in a
CAST model. There is only one Outer Boundary that should exist
in your model, and the region inside the Outer Boundary
represents the concrete continuum. This means that other CAST
objects, such as Inner Boundaries, Strut-and-Tie models, Bearing
Plates, Point Loads, and Point Supports, cannot exist when there
is no Outer Boundary defined or it is removed. However, there
are two situations where you can still remove the Outer
Boundary, namely:
- You press the Esc key during creating the
Outer Boundary.
- You click the Undo button just after you
finish creating the Outer Boundary.
You are surely allowed to change the positions of the
Boundary Corners. You are also allowed to add and remove
Boundary Corners as you want.
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