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The cyclic plastic moment of P-M2-M3 and fiber hinges will lead to ratcheting behavior, or accumulation of plastic deformation in the axial direction. According to plasticity theory and observed structural element behavior, this type of nonlinear response is expected.

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Related Incidents:

  • Incident 18341: Ratcheting for PMM hinges explained by bm.
  • Incident 48618: Additional explanation for interacting and fiber PMM hinges.

Related Emails:

  • Email "fiber vs. PMM hinge, axial effects": (bm → ma, 10/16/2012, ID 9538306)

TO DO:

3 incomplete , add content per Bob's 3-31-14 email.