Response Modification Factor of Haunch Retrofitted Reinforced Concrete Frames
Publication: Journal of Performance of Constructed Facilities
Volume 34, Issue 6
Abstract
This paper presents experimental and numerical research carried out on low-rise reinforced concrete (RC) frames that have weaker beam-column joints, which are retrofitted with steel haunches to avoid joint shear hinging, allowing beam-column members to deform inelastically and dissipate energy under seismic excitation. Shake table tests were conducted on four reduced scale two-story reinforced concrete frames, having construction deficiencies that are common in developing countries, which were retrofitted with steel haunches to understand their seismic behavior and retrieve the seismic response parameters. A representative numerical model was prepared in finite-element (FE)-based software SeismoStruct, calibrated against the experiments in simulating the structures’ roof displacement time history response and predicting the peak roof displacement and peak base shear force, which showed promising performance. Further, FE based models were subjected to a suite of spectrum compatible natural accelerograms, which were linearly scaled to multiple intensity levels, to perform an incremental dynamic analysis. The structure capacity curve (base shear versus roof displacement) and response curve (seismic intensity versus roof displacement) were retrieved, which were analyzed to calculate the structure-overstrength-based and ductility-based response modification factors. The derived response modification factor can be employed in a force-based design and assessment of haunch-retrofitted reinforced-concrete frame structures. An example case study is presented for the performance assessment of as-built and retrofitted reinforced concrete frames in various seismic zones.
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Data Availability Statement
All data, models, or code generated or used during the study are available from the corresponding author by request. The items that may be requested are as follows: shake table tests data of both as-built and retrofitted models (raw and processed data) and the SeismoStruct numerical models.
Acknowledgments
The authors are grateful to the reviewers for encouraging the research study and providing constructive remarks, which improved the quality of the paper. The research presented in this study is part of the Ph.D. study of the first author in the Department of Civil Engineering of the Univ. of Engineering and Technology (UET) Peshawar under the supervision of Prof. Dr. Bashir Alam (Professor, Department of Civil Engineering) and Dr. Naveed Ahmad (Associate Professor and Postgraduate Advisor of Earthquake Engineering, Department of Civil Engineering).
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Journal of Performance of Constructed Facilities
Volume 34 • Issue 6 • December 2020
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© 2020 American Society of Civil Engineers.
History
Received: Aug 10, 2018
Accepted: Jun 26, 2020
Published online: Sep 23, 2020
Published in print: Dec 1, 2020
Discussion open until: Feb 23, 2021
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