Experimental study of the restoring force mechanism in the self-centering beam (SCB)

Abhilasha MAURYA, Matthew R. EATHERTON

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PDF(627 KB)
Front. Struct. Civ. Eng. ›› 2016, Vol. 10 ›› Issue (3) : 272-282. DOI: 10.1007/s11709-016-0346-x
RESEARCH ARTICLE

Experimental study of the restoring force mechanism in the self-centering beam (SCB)

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Abstract

In the past, several self-centering (SC) seismic systems have been developed. However, examples of self-centering systems used in practice are limited due to unusual field construction practices, high initial cost premiums and deformation incompatibility with the gravity framing. A self centering beam moment frame (SCB-MF) has been developed that mitigates several of these issues while adding to the advantages of a typical SC system. The self-centering beam (SCB) is a shop-fabricated, self-contained structural component that when implemented in a moment resisting frame can bring a building back to plumb after an earthquake. This paper describes the SCB concepts and experimental program on five SCB specimens at two-third scale relative to a prototype building. Experimental results are presented including the global force-deformation behavior. The SCBs are shown to undergo 5%–6% story drift without any observable damage to the SCB body and columns. Strength equations developed for the SCB predict the moment capacity well, with a mean difference of 6% between experimental and predicted capacities. The behavior of the restoring force mechanism is described. The limit states that cause a loss in system's restoring force which lead to a decrease in the self-centering capacity of the SCB-MF, are presented.

Keywords

self-centering seismic system / seismic design / hysteretic behavior / restoring force / resilient structural system

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Abhilasha MAURYA, Matthew R. EATHERTON. Experimental study of the restoring force mechanism in the self-centering beam (SCB). Front. Struct. Civ. Eng., 2016, 10(3): 272‒282 https://doi.org/10.1007/s11709-016-0346-x

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Acknowledgements

This material is based upon the work supported by the National Science Foundation under Grant No. (CMMI-1200237). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or other sponsors. Funding was also provided by the American Institute of Steel Construction. In-kind donations for the large-scale tests were provided by Banker steel, Hayes Industries, Weinstock Bros and American Spring Wire.

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2016 Higher Education Press and Springer-Verlag Berlin Heidelberg
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