Deterioration Modeling of Steel Moment Resisting Frames Using Finite-Length Plastic Hinge Force-Based Beam-Column Elements
Publication: Journal of Structural Engineering
Volume 141, Issue 2
Abstract
The use of empirically calibrated moment-rotation models that account for strength and stiffness deterioration of steel frame members is paramount in evaluating the performance of steel structures prone to collapse under seismic loading. These deterioration models are typically used as zero-length springs in a concentrated plasticity formulation; however, a calibration procedure is required when they are used to represent the moment-curvature behavior in distributed plasticity formulations because the resulting moment-rotation response depends on the element integration method. A plastic hinge integration method for using deterioration models in force-based elements is developed and validated using flexural stiffness modifications parameters to recover the exact solution for linear problems while ensuring objective softening response. To guarantee accurate results in both the linear and nonlinear range of response, the flexural stiffness modification parameters are computed at the beginning of the analysis as a function of the user-specified plastic hinge length. With this approach, moment-rotation models that account for strength and stiffness deterioration can be applied in conjunction with force-based plastic hinge beam-column elements to support collapse prediction without increased modeling complexity.
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Acknowledgments
In the development of this research work, the first and fourth authors would like to acknowledge the support of the Portuguese Science and Technology Foundation through the program SFRH/BD/77722/2011 and UNIC Research Center at the Universidade Nova de Lisboa. The support of the School of Civil and Construction Engineering at Oregon State University to the second and third authors is gratefully acknowledged. The opinions and conclusions presented in this paper are those of the authors and do not necessarily reflect the views of the sponsoring organizations.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 2 • February 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 25, 2013
Accepted: Feb 11, 2014
Published online: Jul 8, 2014
Discussion open until: Dec 8, 2014
Published in print: Feb 1, 2015
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