Stability Analysis of Direct Integration Algorithms Applied to Nonlinear Structural Dynamics
Publication: Journal of Engineering Mechanics
Volume 134, Issue 9
Abstract
Direct integration algorithms are often used to solve the temporally discretized equations of motion for structural dynamic problems. Numerous studies have been conducted to investigate the stability of integration algorithms for linear elastic structures. Studies involving the stability analysis of integration algorithms for nonlinear structures are limited. This paper utilizes discrete control theory to investigate the stability of direct integration algorithms for nonlinear structural dynamics. The direct integration algorithms are represented by a closed-loop block diagram, where the nonlinear restoring force of the structure is related to a varying feedback gain. The root locus method is used to analyze the stability of the closed-loop system for various degrees of nonlinear structural behavior. The well-known methods of the Newmark family of integration algorithms and the Hilber–Hughes–Taylor method, as well as a newly developed integration algorithm, referred to as the CR integration algorithm, are analyzed using the proposed method. It is shown that the stability of an integration algorithm under nonlinear structural behavior is dependent on the poles and zeros of its open-loop discrete transfer function. An unconditionally stable integration algorithm for linear elastic structures is shown not to always remain stable under nonlinear structural behavior.
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Acknowledgments
This paper is based upon work supported by a grant from the Pennsylvania Dept. of Community and Economic Development through the Pennsylvania Infrastructure Technical Alliance, and by the National Science Foundation (NSF) under Grant No. NSFCMS-0402490 within the George E. Brown, Jr. Network for Earthquake Engineering Simulation Consortium Operation. Their support is gratefully appreciated. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the writers and do not necessarily reflect the views of the sponsors.
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© 2008 ASCE.
History
Received: Dec 22, 2006
Accepted: Feb 14, 2008
Published online: Sep 1, 2008
Published in print: Sep 2008
Notes
Note. Associate Editor: Lambros S. Katafygiotis
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