Influence of Column Strength and Stiffness on the Inelastic Behavior of Strong-Column-Weak-Beam Frames
Publication: Journal of Structural Engineering
Volume 143, Issue 9
Abstract
The design philosophy of strong-column-weak-beam (SCWB) in which plastic deformation is predominantly allowed to occur in beams while columns remain essentially elastic is commonly adopted in seismic design codes for moment-resisting frames. Practical design of SCWB frames is employed by using the beam-to-column-joint ratio, which is mainly done to prevent formation of plastic hinges in columns without consideration of the global inelastic behavior of the SCWB frame. This paper investigates the inelastic behavior of SCWB frames with different distributions of beam and column plastic strengths at different ductility demand levels. Midrise 9-story steel frames were designed as SCWB frames with the same lateral strength but with different column strength and stiffness relative to those of the beams. Nonlinear static and dynamic analysis results indicate that the relative plastic flexural capacities of the beams and column bases have a significant effect on the structural deformation and seismic response of SCWB frames. The structural response and beam-to-column-joint demand strongly depend on the column strength and stiffness. The results indicate that a global parameter may be used in addition to the beam-to-column-joint ratio to control the inelastic response behavior of strong-column-weak-beam frames.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Research Council of Thailand (NRCT) and the Thailand Research Fund (TRF) to the first author. The authors would also like to thank Professor Emeritus Subhash C. Goel of the University of Michigan and Associate Professor Tony Yang of the University of British Columbia for their assistance and comments while carrying out this research. The conclusions and opinions expressed in this paper are solely those of the authors and do not necessarily represent the views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 143 • Issue 9 • September 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 29, 2016
Accepted: Apr 4, 2017
Published online: Jun 29, 2017
Published in print: Sep 1, 2017
Discussion open until: Nov 29, 2017
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