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Trunnions on elbows can reduce elbow stiffness. Users can reduce elbow flexibilities by selecting one or more elbows with a trunnion, then Design menu>Assign Design Properties for Object Type Elbow as shown below left. Users can also select elbows then assign Pipe>Property modifiers to modify scale the moment moments of inertia and stiffness in other directions of selected elbows as using the dialogue shown below right.
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