Proposed Panel Zone Model for Seismic Design of Steel Moment-Resisting Frames
Publication: Journal of Structural Engineering
Volume 147, Issue 4
Abstract
This paper proposes a new mechanics-based model for the seismic design of beam-to-column panel zone joints in steel moment-resisting frames. The model is based on realistic shear stress distributions retrieved from continuum finite element (CFE) analyses of representative panel zone geometries. Comparisons with a comprehensive experimental data set suggest that the proposed model predicts the panel zone stiffness and shear strength with a noteworthy accuracy, even in panel zones featuring columns with thick flanges (thicker than 40 mm), as well as in cases with high beam-to-column aspect ratios (larger than 1.5). In that respect, the proposed model addresses the limitations of all other available models in the literature. If doubler plates are deemed necessary in the panel zone design, the CFE simulations do not depict any doubler-to-column web shear stress incompatibility, provided the current detailing practice is respected. Hence, the total thickness of the column web and doubler plates should be directly used in the proposed panel zone model. The panel zone shear strength reduction due to the axial load effects should be based on the peak axial compressive load, including the transient component due to dynamic overturning effects in exterior joints. It is found that the commonly used von Mises criterion suffices to adequately predict the shear strength reduction in the panel zone.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available in a repository (doi: https://www.doi.org/10.5281/zenodo.3689756) or online in accordance with funder data retention policies. Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request. The proposed model has been implemented in TCL procedures that can be used for system level simulations with the OpenSees simulation platform. These procedures are made publicly available through GitHub (https://github.com/RESSLab-Team/Panel_Zone_Model_OpenSees).
Acknowledgments
This study is based on work supported by a Nippon Steel Corporation collaborative grant as well as an EPFL internal grant for the first and second authors. The financial support is gratefully acknowledged. The authors would like to sincerely thank Prof. Dr. Bozidar Stojadinovic from ETH-Zürich, for providing test data for the development of the inelastic panel zone database. Any opinions, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of sponsors.
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Journal of Structural Engineering
Volume 147 • Issue 4 • April 2021
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© 2021 American Society of Civil Engineers.
History
Received: Dec 20, 2019
Accepted: Oct 7, 2020
Published online: Jan 18, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 18, 2021
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