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Validation of a steel dual-core self-centering brace (DC-SCB) for seismic resistance: from brace member to one-story one-bay braced frame tests

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Abstract

A steel dual-core self-centering brace (DC-SCB) is an innovative structural member that provides both energy dissipation and self-centering properties to structures, reducing maximum and residual drifts of structures in earthquakes. The axial deformation capacity of the DC-SCB is doubled by a parallel arrangement of two inner cores, one outer box and two sets of tensioning elements. This paper presents cyclic test results of a DC-SCB component and a fullscale one-story, one-bay steel frame with a DC-SCB. The DC-SCB that was near 8 m-long was tested to evaluate its cyclic behavior and durability. The DC-SCB performed well under a total of three increasing cyclic loading tests and 60 lowcycle fatigue loading tests without failure. The maximum axial load of the DC-SCB was near 1700 kN at an interstory drift of 2.5%. Moreover, a three-story dual-core self-centering braced frame (DC-SCBF) with a single-diagonal DC-SCB was designed and its first-story, one-bay DC-SCBF subassembly specimen was tested in multiple earthquake-type loadings. The one-story, one-bay subassembly frame specimen performed well up to an interstory drift of 2% with yielding at the column base and local buckling in the steel beam; no damage of the DC-SCB was found after all tests. The maximum residual drift of the DC-SCBF caused by beam local buckling was 0.5% in 2.0% drift cycles.

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Authors and Affiliations

  1. Department of Civil Engineering, Taiwan University, Taipei, Taiwan, China

    Chung-Che Chou, Ping-Ting Chung, Tsung-Han Wu & Alexis Rafael Ovalle Beato

  2. Center for Earthquake Engineering Research (CEER), Taiwan University, Taipei, Taiwan, China

    Chung-Che Chou

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  1. Chung-Che Chou
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  2. Ping-Ting Chung
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  3. Tsung-Han Wu
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  4. Alexis Rafael Ovalle Beato
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Correspondence to Chung-Che Chou.

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Chou, CC., Chung, PT., Wu, TH. et al. Validation of a steel dual-core self-centering brace (DC-SCB) for seismic resistance: from brace member to one-story one-bay braced frame tests. Front. Struct. Civ. Eng. 10, 303–311 (2016). https://doi.org/10.1007/s11709-016-0347-9

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