Steel and Composite Structures

  • 제45권2호
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  • Pages.263-279
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  • 2022
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Degree of hydration-based thermal stress analysis of large-size CFST incorporating creep

  • Xie, Jinbao (Department of Bridge Engineering, Tongji University) ;
  • Sun, Jianyuan (Department of Bridge Engineering, Tongji University) ;
  • Bai, Zhizhou (Department of Bridge Engineering, Tongji University)
  • 투고 : 2021.03.21
  • 심사 : 2022.10.26
  • 발행 : 2022.10.25
⟨ 이전 논문 다음 논문 ⟩

초록

With the span and arch rib size of concrete-filled steel tube (CFST) arch bridges increase, the hydration heat of pumped mass concrete inside large-size steel tube causes a significant temperature variation, leading to a risk of thermal stress-induced cracking during construction. In order to tackle this phenomenon, a hydration heat conduction model based on hydration degree was established through a nonlinear temperature analysis incorporating an exothermic hydration process to obtain the temperature field of large-size CFST. Subsequently, based on the evolution of elastic modulus based on hydration degree and early-age creep rectification, the finite element model (FEM) model and analytical study were respectively adopted to investigate the variation of the thermal stress of CFST during hydration heat release, and reasonable agreement between the results of two methods is found. Finally, a comparative study of the thermal stress with and without considering early-age creep was conducted.

키워드

과제정보

This research was funded by the National Natural Science Foundation of China (Grant No. 51778466).

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