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Frontiers of Structural and Civil Engineering

Front. Struct. Civ. Eng.    2016, Vol. 10 Issue (3) : 303-311
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
Chung-Che CHOU(),Ping-Ting CHUNG1,Tsung-Han WU1,Alexis Rafael Ovalle BEATO1
1. Department of Civil Engineering, Taiwan University, Taipei, Taiwan, China
2. Director, Center for Earthquake Engineering Research (CEER), Taiwan University, Taipei, Taiwan, China
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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 full-scale 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 low-cycle 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.

Keywords dual-core self-centering brace (DC-SCB)      braced frame tests      residual deformation     
Corresponding Author(s): Chung-Che CHOU   
Online First Date: 10 August 2016    Issue Date: 25 October 2016
 Cite this article:   
Chung-Che CHOU,Ping-Ting CHUNG,Tsung-Han WU, 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[J]. Front. Struct. Civ. Eng., 2016, 10(3): 303-311.
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Chung-Che CHOU
Ping-Ting CHUNG
Tsung-Han WU
Alexis Rafael Ovalle BEATO
Fig.1  Tests and recent applications of SBRB in China Mainland and Taiwan. (a) SBRB section (mm); (b) test setup; (c) hysteretic response; (d) applications of SBRB (Taipei Envision Engineering Consultant; Shanghai Lanke Building Damping Technology Co.)
Fig.2  Kinematics and hysteretic response of the cross-anchored DC-SCB
Fig.3  Test setup of the cross-anchored DC-SCB (unit: mm). (a) Test setup; (b) cross section of the brace
Fig.4  Axial force versus axial displacement relationship of the cross-anchored DC-SCB. (a) phase 1; (b) phase 2
frame Cs W (kN) Vdes (kN) T, first-mode period (s) code period (1.4Ta)
DC-SCBF 0.125 4222 792 0.47 0.62
Tab.1  Design properties of a prototype three-story DC-SCBF
floor design parameter 2% drift
Freq (kN) Fdt (kN) Pdt (kN) Pf (kN) n Fut (kN) εpt (%)
3 349 400 277 123 8 941 0.75
2 630 700 416 284 12 1492 0.75
1 729 800 416 384 12 1597 0.76
Tab.2  Design strength of DC-SCBs in each floor
Fig.5  Elevation and pushover analysis of a DC-SCBF. (a) DC-SCBF; (b) pushover analysis
Fig.6  Actuator force versus displacement relationships of the subassembly (Phase 3, 7 and 8 tests). (a) Phase 3 test; (b) Phase 7 test (TCU039, MCE); (c) Phase 8 test (10 cycles)
Fig.7  DC-SCBF subassembly at 2% drift (Phase 3 test). (a) Overall view; (b) beam buckling
Fig.8  Test response in different test phases. (a) Lateral force ratio; (b) PT force and friction force in DC-SCB
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