Seismic Retrofit and Strengthening of Reinforced Concrete Moment Frames with Strongback-Braced System
Publication: Practice Periodical on Structural Design and Construction
Volume 29, Issue 2
Abstract
Using the steel strongback braced (SB) system to seismically strengthen and retrofit reinforced concrete moment frames (RCMFs), this research aims to enhance the effectiveness of RCMFs. In this study, RCMFs of 5-, 10-, and 15-stories were designed according to the first and fourth editions of the Iran Earthquake Standard 2800. The RCMFs designed for the first edition are strengthened and reinforced using the strongback braced system. The studied structures were analyzed under incremental static loading and time history analysis. The findings indicate that the yield force and maximum base shear of structures designed using the fourth edition have increased by a range of 1.28–1.42 compared with those designed with the first edition. This underscores the imperative to enhance the structural integrity of buildings constructed according to the first edition. Meanwhile, the results of retrofitted structures with strongback braces show the same or better performance than newly designed structures. This indicates that this retrofitting system has a favorable effect on uniform drift control. A reduction of 33%–44% in story drift was observed when the SB system is added to the first edition’s structure.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Published In
Practice Periodical on Structural Design and Construction
Volume 29 • Issue 2 • May 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jun 14, 2023
Accepted: Nov 28, 2023
Published online: Feb 10, 2024
Published in print: May 1, 2024
Discussion open until: Jul 10, 2024
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