Steel and Composite Structures

  • 제40권2호
  • /
  • Pages.217-241
  • /
  • 2021
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Seismic performance of steel columns corroded in general atmosphere

  • Wang, Youde (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Shi, Tao (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Nie, Biao (School of Civil Engineering, Xi'an University of Architecture & Technology) ;
  • Wang, Hao (Central Research Institute of Building and Construction Co. Ltd. MCC Group) ;
  • Xu, Shanhua (School of Civil Engineering, Xi'an University of Architecture & Technology)
  • 투고 : 2019.12.12
  • 심사 : 2020.11.02
  • 발행 : 2021.07.25
⟨ 이전 논문 다음 논문 ⟩

초록

Steel structures exposed to general atmosphere for a long time are highly susceptible to corrosion damage, which would lead to the degradation of service performance of the components and even structures. This article focuses on the effect of corrosion on the seismic performance of steel column. The accelerated corrosion tests in general atmosphere were conducted on 7 H-shaped steel columns and 20 steel plates. Then the obtained plate specimens were subjected to monotonic tensile tests and cyclic loading tests, and the steel columns were subjected to pseudo-static tests, respectively, to study the effects of corrosion on their mechanical properties and seismic performance. Then, a simplified three-dimensional finite element model (FEM) capable of accurately simulating the hysteretic response of corroded steel columns under low-cycle loading was established. Experimental results indicated that the yield strength, tensile strength, elastic modulus and peak strain of corroded steel plate decreased linearly with the proposed corrosion damage parameter Dn, and the energy dissipations under low-cycle loading were significantly reduced. There is a correlation between the cyclic hardening parameters of corroded steel and the yield-tensile strength difference (SD), and then a simplified formula was proposed. Corrosion could result in the premature entrance of each loading stage of corroded columns and the deterioration of buckling deformation range, bearing capacity and energy dissipation, etc. In addition, a larger axial compression ratio (CR) would further accelerate the failure process of corroded columns. The parametric finite element analysis (FEA) indicated that greater damage was found for steel columns with non-uniform corrosion, and hysteretic performance degraded more significantly when corrosion distributed at flanges or foot zone.

키워드

과제정보

This work was supported by the National Natural Science Foundation of China (Grant No. 51908455), China Postdoctoral Science Foundation (Grant No. 2019M653572), and Scientific Research Project of Shaanxi Provincial Department of Education (Grant No. 19JS042).

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