Influence of Types of End Connections and Detailing of End-Protected Zones on Seismic Performance of SCBFs
Publication: Journal of Structural Engineering
Volume 147, Issue 1
Abstract
This paper presents an experimental investigation to study the influence of the type of end connections as well as the detailing of end-protected zones on the seismic performance of special concentrically braced frames (SCBFs). Depending on the plane of the brace buckling and the location of plastic hinges, three types of end connections are considered in this study: the in-plane buckling brace system, the out-of-plane buckling brace system, and the direct-connection brace system. Five large-scale braced frame subassemblages are tested under quasi-static reversed cyclic loading. The main parameters studied are the energy dissipation, postbuckling strength, fracture ductility, and failure modes of test specimens. Test results showed that the fatigue performance of the brace specimen is increased by increasing the flexibility of the secondary hinges and a higher fracture ductility can be achieved for the restraint-free rotation of hinge plates. The higher flexibility of the secondary hinges resulted in the spreading of inelastic strain along the brace length. Lower postbuckling strengths of the braces resulted in higher fracture ductility. Test results highlighted the importance of the end-protected zones in the prediction of the fracture ductility of braces for the collapse-performance assessment of the braced frames. Based on this study, recommendations on the design and detailing of end-protected zones have been proposed considering the critical limit states to achieve the desired yield hierarchy of SCBFs.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request.
Acknowledgments
The authors are thankful to the Ministry of Human Resources and Development, Government of India for the Prime Minister’s Research Fellowship (PMRF), and to the Department of Science and Technology (DST)-FIST for the financial and equipment support to carry out this research. The help and support received from staff members of the Heavy Structures Laboratory, IIT Delhi is gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 147 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 13, 2020
Accepted: Aug 23, 2020
Published online: Oct 26, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 26, 2021
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