剥落
刚度
防火性能
背景(考古学)
有限元法
结构工程
相(物质)
冗余(工程)
工程类
防火
耐火试验
法律工程学
土木工程
材料科学
耐火性
地质学
复合材料
物理
可靠性工程
古生物学
量子力学
作者
Francesco Lo Monte,Patrick Bamonte,Carlo BELTRAMI
标识
DOI:10.1016/j.tust.2022.104838
摘要
Fire performance of tunnels can represent a critical issue in the design phase, even more than for other structures and infrastructures, due to some inherent features such as (a) the fire compartment geometry often leading to very high temperature (also making difficult the intervention of fire brigades), (b) the structural redundancy caused by soil restraint fostering the development of relevant indirect actions, and (c) the high compression state in the lining (all the more during the fire exposure) that increases the spalling propensity and severity. Within this context, the role played by key parameters such as lining thickness and stiffness are investigated by comparing the fire performance of two different technological solutions for the lining: (1) traditional cast-in-situ lining and (2) pre-cast segmental tunnel lining. The fire scenario also considers the cooling phase, in order to discuss the main critical points to be solved when facing the final stage of the fire. 3D finite element analyses have been performed, proving that (I) higher thickness and stiffness does not necessarily correspond to a higher safety factor due to the indirect actions, and (II) fire cooling phase (if any) can be even more critical than the heating phase.
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