Structural Engineering and Mechanics

  • 제84권3호
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  • Pages.345-360
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  • 2022
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  • 1225-4568(pISSN)
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  • 1598-6217(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Seismic performance of RC columns retrofitted using high-strength steel strips under high axial compression ratios

  • Yang, Yong (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Hao, Ning (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Xue, Yicong (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Feng, Shiqiang (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Yu, Yunlong (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Zhang, Shuchen (School of Civil Engineering, Xi'an University of Architecture & Technology)
  • 투고 : 2022.06.19
  • 심사 : 2022.09.20
  • 발행 : 2022.11.10
⟨ 이전 논문 다음 논문 ⟩

초록

In this paper, the impact on seismic performance of an economical effective technique for retrofitting reinforced concrete (RC) columns using high-strength steel strips under high axial compression ratios was presented. The experimental program included a series of cyclic loading tests on one nonretrofitted control specimen and three retrofitted specimens. The effects of the axial compression ratio and spacing of the steel strips on the cyclic behavior of the specimens were studied. Based on the test results, the failure modes, hysteretic characteristics, strength and stiffness degradation, displacement ductility, and energy dissipation capacity of the specimens were analyzed in-depth. The analysis showed that the transverse confinement provided by the high-strength steel strips could effectively delay and restrain diagonal crack development and improve the failure mode, which was flexural-shear failure controlled by flexural failure with better ductility. The specimens retrofitted using high-strength steel strips showed more satisfactory seismic performance than the control specimen. The seismic performance and deformation capacity of the retrofitted RC columns increased with decreasing axial compression ratio and steel strip spacing. Based on the test results, a hysteretic model for RC columns that considers the transverse confinement of high-strength steel strips was then established. The hysteretic model showed good agreement with the experimental results, which verified the effectiveness of the proposed hysteretic model. Therefore, the aforementioned analysis can be used for the design of retrofitted RC columns.

키워드

과제정보

This work was supported by Basic Research Program of Natural Science of Shaanxi Province (Program No. 2019JC-30) and the National Natural Science Foundation of China (Program No. 51978565). The financial supports are highly appreciated. In addition, most authors of the paper are members of the Youth Innovation Team of Shaanxi Universities.

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