Application of an Innovative SMA Ring Spring System for Self-Centering Steel Frames Subject to Seismic Conditions
Publication: Journal of Structural Engineering
Volume 144, Issue 8
Abstract
This paper presents an innovative shape memory alloy (SMA) ring spring system used for high-performance steel beam-to-column connections. The ring spring system, which includes a series of SMA outer rings and high-strength alloy inner rings stacked in alternation with mating tapered faces, is used in conjunction with high-strength bolts in typical extended end-plate connections to achieve favorable self-centering and energy dissipation response while ensuring ease of construction. An experimental investigation on three proof-of-concept connection specimens with varying SMA ring thicknesses and bolt preload levels is conducted first, where the key properties, including strength, stiffness, ductility, self-centering capability, and energy dissipation, are discussed in detail. Following the experimental program, a three-dimensional (3D) numerical study is carried out that enables a more in-depth interpretation of the test results and supports the design of full-scale self-centering connections for a prototype steel moment frame. A system-level time-history analysis is then performed on the frame with various layouts of the SMA connections, and it is shown that, compared with a conventional steel frame, the structure with the SMA connections exhibits comparable maximum interstory drifts but significantly reduced residual drifts. The results also reveal that a reasonable balance between structural performance and cost may be achieved by an appropriate arrangement of the SMA connections within the structure.
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Acknowledgments
The financial support from the Natural Science Foundation of China (NSFC) with Grant Nos. 51778456 and 51778459 is gratefully acknowledged. The study was also supported by the Collaborative Research Project under International Joint Research Laboratory of Earthquake Engineering at Tongji University and by the Fundamental Research Funds for the Central Universities.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Aug 30, 2017
Accepted: Mar 1, 2018
Published online: Jun 4, 2018
Published in print: Aug 1, 2018
Discussion open until: Nov 4, 2018
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