Reformulation of Concentrated Plasticity Frame Element with N-M Interaction and Generalized Plasticity
Publication: Journal of Structural Engineering
Volume 150, Issue 1
Abstract
The concept of generalized plasticity theory provides an appealing approach to developing efficient finite element models that can improve computational performance and allow flexibility in customizing plastic response. In this work, we revisit its application in developing frame elements and reformulate a concentrated plasticity frame element to allow its axial force to interact with its end moments (N-M interaction). The proposed element formulation relies on the physical implication of axial plasticity and updates its definition accordingly. Inasmuch, a single axial plasticity history can participate in plasticity evolution and N-M interaction at both ends. The new formulation also redefines the hardening rules to recover desired hardening behavior, which is not available in the previous formulation. In terms of numerical performance, the new formulation removes the potential bifurcation issue when both ends experience identical pure axial plasticity history. The proposed frame element is a high-performing alternative to simulate zero-length plastic hinge frame members that are frequently used in simulations in seismic engineering.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. The corresponding model scripts are available online (https://github.com/TLCFEM/nm-formulation).
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Published In
Journal of Structural Engineering
Volume 150 • Issue 1 • January 2024
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Oct 20, 2022
Accepted: Jul 5, 2023
Published online: Nov 9, 2023
Published in print: Jan 1, 2024
Discussion open until: Apr 9, 2024
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