Technical Papers
Jan 31, 2022

State-Space Formulation for Structural Analysis with Coupled Degradation-Plasticity and Geometric Nonlinearity

Publication: Journal of Structural Engineering
Volume 148, Issue 4

Abstract

A nonlinear beam finite-element model is developed to account for distributed plasticity, complex degradation phenomena, axial–moment–shear interactions, and geometric nonlinearity. The formulation is derived based on consistently coupled degradation-plasticity multiaxial hysteretic laws. The strength degradations corresponding to axial, shear, and flexural capacities are treated as scalar damage functions, and the multiaxial hysteretic model is presented in the effective stress domain to satisfy the consistency criterion of the evolving yield/capacity surface. Geometric nonlinearity is incorporated through an element-level P-Δ formulation, by accounting for second-order transverse displacement effects in the beam kinematics. Constant element matrices, including elastic stiffness, geometric stiffness, and hysteretic matrices, are derived from the principle of virtual work and do not require updating throughout the analysis. Material inelasticity and degradations evolve through element-level ordinary differential equations (ODEs) based on the multiaxial hysteretic laws and are solved simultaneously with the governing equations of motion of the system. Overall, the entire system-level formulation is presented in state-space form and can be straightforwardly solved using any general first-order ODE solver without requiring gradient evaluations. Model consistency, validity, and versatility are demonstrated through several numerical illustrations and experimental verifications.

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Data Availability Statement

All codes generated during the study are available from the authors by request.

Acknowledgments

The authors would like to acknowledge the support of the US National Science Foundation, which supported this research under Grant Nos. CMMI-1351591 and CMMI-1634575, and to thank Dr. Dimitrios G. Lignos and Dr. Ahmed Elkady for providing the detailed experimental data.

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Journal of Structural Engineering
Volume 148Issue 4April 2022

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Received: Nov 11, 2019
Accepted: Jun 9, 2021
Published online: Jan 31, 2022
Published in print: Apr 1, 2022
Discussion open until: Jun 30, 2022

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M. Amir, S.M.ASCE [email protected]
Graduate Student Researcher, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., University Park, PA 16802 (corresponding author). Email: [email protected]
K. G. Papakonstantinou, M.ASCE [email protected]
Associate Professor, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., University Park, PA 16802. Email: [email protected]
G. P. Warn, A.M.ASCE [email protected]
Associate Professor, Dept. of Civil and Environmental Engineering, Pennsylvania State Univ., University Park, PA 16802. Email: [email protected]

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