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• Resultant moment M is then given as M = M₂ cosθ x + M₃ sinθ, and projected plastic rotation R_p is given as R_p = R_{2 p2} cosθ x + R_{3 p3} sinθ.

• These relationships indicate that the moment and rotation values of a P-M2-M3 moment-rotation curve are obtained through basic geometric relationships between components projected along the M2 and M3 axes, as shown in Figure 1:

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