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Steel and Composite Structures Volume 45, Number 2, October25 2022 , pages 263-279 DOI: https://doi.org/10.12989/scs.2022.45.2.263 |
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Degree of hydration-based thermal stress analysis of large-size CFST incorporating creep |
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Jinbao Xie, Jianyuan Sun and Zhizhou Bai
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| Abstract | ||
| 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 stressinduced 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. | ||
| Key Words | ||
| analytical study; concrete-filled steel tube; early-age creep; hydration heat; temperature; thermal stress | ||
| Address | ||
| Jinbao Xie:Department of Bridge Engineering, Tongji University, Shanghai 200092, China Jianyuan Sun and Zhizhou Bai:1)Department of Bridge Engineering, Tongji University, Shanghai 200092, China 2)College of Civil and Architectural Engineering, Xinjiang University, Urumqi 830046, China | ||