RESEARCH ON THE HIGH-TEMPERATURE MECHANICAL PROPERTIES OF CORRUGATED STEEL-CONCRETE COMPOSITE STRUCTURES IN TUNNEL ENGINEERING UNDER FIRE

АУТОР(И) / AUTHOR(S): Bo Lei, Wenqi Ding, Qingzhao Zhang 

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DOI:  10.46793/ACUUS2025.2.4.38

САЖЕТАК / ABSTRACT:

Corrugated steel-concrete (CSC) composite structures have been increasingly applied in tunnel engineering due to their excellent mechanical properties. Due to the frequent occurrence of tunnel fires, accurately evaluating the high-temperature mechanical properties of CSC composite structures is crucial for determining the stability of lining structures under tunnel fires. This paper employs the novel S32001 duplex stainless steel to investigate the thermo-mechanical coupling of CSC composite structures through numerical simulation. The study explores the load-bearing capacity and deformation characteristics of CSC composite structures under various temperature conditions and the ISO 834 standard heating curve, while evaluating structural stability across different operating conditions. Research indicates that CSC composite structures exhibit similar deformation characteristics under temperature conditions ranging from 100 °C to 500 °C, with vertical displacement and stress levels increasing as temperature rises and time progresses. Under the ISO834 heating curve, corrugated steel plates heats up relatively quickly and the trough temperature is higher than the peak temperature. The temperature field distribution of the concrete in the cross-section of the specimen shows the “corrugated” pattern, with the most pronounced corrugation and maximum temperature gradient occurring at the troughs. Significant thermal deformation differences exist at the interface between the rebar cage and concrete, resulting in pronounced internal cracking at this area. No delamination occurred at the interface between the corrugated steel plate and concrete, and the overall deformation of the CSC composite structures remained controllable. This study demonstrates the superior fire resistance of CSC composite structures, aiding in fire protection design for such structures in tunnel engineering and providing guidance for the stability research of tunnel lining structures under fire scenarios.

КЉУЧНЕ РЕЧИ / KEYWORDS:

Tunnel engineering, Corrugated steel-concrete composite structures, Fire, Numerical simulation, High-temperature mechanical properties

ПРОЈЕКАТ / ACKNOWLEDGEMENT:

The authors wish to acknowledge the sponsorship from the National Natural Science Foundation of China(NO.52378405),  the Major Science and Technology Special Project of Yunnan Provincial Department of Transportation(No.202302AD080007), and “Transportation Science and Technology Demonstration Project of the Ministry of Transport: Intelligent Construction Science and Technology Demonstration Project of Complex Environment Tunnels along the Jinsha River Expressway in Yunnan Province”.

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