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Earthquakes and Structures Volume 20, Number 6, June 2021 , pages 669-680 DOI: https://doi.org/10.12989/eas.2021.20.6.669 |
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Seismic performance and damage evaluation of spiral ribbed thin-walled concrete filled and encased steel tube composite columns |
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Zhen-shan Wang, Yong-jian Feng, Hong-chao Guo, Jun-long Lu and Jian-bo Tian
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| Abstract | ||
| As a new type of composite components, thin-walled concrete-filled steel tubes (CFSTs) have some advantages in terms of economy and processing. After the steel tube wall thins, the local buckling performance decreases and the stiffness decreases, which is not conducive to the structural safety. In this paper, combining the advantages of traditional spiral hoops and a stiffener, a new constraint in the form of a screw stiffener was proposed. On this basis, the composite member of thin-walled CFSTs with spiral ribs was put forward. The horizontal hysteretic test was carried out for the new composite column, and the failure mode, hysteretic characteristics, ductility, and energy dissipation capacity were obtained. The results showed that, compared with the traditional form, the seismic bearing capacity of the new composite column was increased by 11% and the ductility was increased by 45%. The deformation capacity was significantly improved. Based on experimental research, the seismic bearing capacity calculation and seismic damage assessment of the composite column were studied, and the practical calculation and the two-parameter damage assessment method considering the interaction between deformation and energy were proposed, which were in good agreement with the test results. This study can provide a technical basis for its engineering application. The composite column has good seismic performance, durability, and fire resistance, and thus has potential for application in practice. | ||
| Key Words | ||
| thin-walled concrete-filled steel tubular; spiral stiffener; hysteretic test; seismic performance; damage evaluation | ||
| Address | ||
| Zhen-shan Wang:State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, China/ School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, China Yong-jian Feng:School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, China Hong-chao Guo:School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, China Jun-long Lu:School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, China Jian-bo Tian:School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, China | ||