Cyclic Loading Test for Two-Story RC Moment Frames Retrofitted with Internal Steel Frames
Publication: Journal of Structural Engineering
Volume 147, Issue 2
Abstract
An internal steel frame–retrofitting method without diagonal braces was studied to strengthen existing reinforced-concrete (RC) moment frames with nonseismic details. For better constructability and structural capacity, a novel shear connection method was developed and verified by cyclic shear testing. To evaluate the seismic performance of retrofitted frames, three two-story moment frames with and without strengthening were tested under cyclic lateral loading. The test results showed that, despite partial composite action between RC and steel members, the proposed retrofit method significantly increased the stiffness and strength of the RC moment frame, achieving a satisfactory deformation capacity greater than 2% drift ratio. On the basis of the test results, the failure mechanism of the retrofitted frame was discussed, considering the shear connection behavior. The test strengths of the frame specimens were compared with the predictions based on a simple plastic mechanism. Further, the degree of partial composite action between the RC and steel members developed by shear connections was addressed to improve the strength predictions.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research described in this paper was financially supported by CTS Engineering Ltd. as well as Institute of Engineering Research at Seoul National University. The authors are grateful to the authorities for their support.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 2 • February 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 15, 2020
Accepted: Sep 18, 2020
Published online: Nov 30, 2020
Published in print: Feb 1, 2021
Discussion open until: Apr 30, 2021
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