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Study on the effects of cooling phase and construction technology on the fire performance of R/C tunnels.

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Title: Study on the effects of cooling phase and construction technology on the fire performance of R/C tunnels.
Authors: LO MONTE, Francesco1 (AUTHOR), BAMONTE, Patrick1 (AUTHOR), BELTRAMI, Carlo2 (AUTHOR)
Source: Tunneling & Underground Space Technology. Feb2023, Vol. 132, pN.PAG-N.PAG. 1p.
Subjects: Redundancy in engineering, Performance technology, Tunnel lining, Fire exposure, Tunnels, Finite element method
Abstract: [Display omitted] • Tunnel structural response in fire strongly depends on indirect actions development. • Lining stiffness must be properly considered in the fire performance assessment. • Thermal gradients lead to severe bending in thick lining (tension on the cold side) • Cooling can be more critical than heating due to high concrete thermal inertia. • Simple algorithms for R/C resistance checks in the cooling phase are proposed. 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. [ABSTRACT FROM AUTHOR]
Copyright of Tunneling & Underground Space Technology is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 161081341
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
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  Label: Title
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  Data: Study on the effects of cooling phase and construction technology on the fire performance of R/C tunnels.
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  Data: <searchLink fieldCode="AR" term="%22LO+MONTE%2C+Francesco%22">LO MONTE, Francesco</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22BAMONTE%2C+Patrick%22">BAMONTE, Patrick</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22BELTRAMI%2C+Carlo%22">BELTRAMI, Carlo</searchLink><relatesTo>2</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Tunneling+%26+Underground+Space+Technology%22">Tunneling & Underground Space Technology</searchLink>. Feb2023, Vol. 132, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Redundancy+in+engineering%22">Redundancy in engineering</searchLink><br /><searchLink fieldCode="DE" term="%22Performance+technology%22">Performance technology</searchLink><br /><searchLink fieldCode="DE" term="%22Tunnel+lining%22">Tunnel lining</searchLink><br /><searchLink fieldCode="DE" term="%22Fire+exposure%22">Fire exposure</searchLink><br /><searchLink fieldCode="DE" term="%22Tunnels%22">Tunnels</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: [Display omitted] • Tunnel structural response in fire strongly depends on indirect actions development. • Lining stiffness must be properly considered in the fire performance assessment. • Thermal gradients lead to severe bending in thick lining (tension on the cold side) • Cooling can be more critical than heating due to high concrete thermal inertia. • Simple algorithms for R/C resistance checks in the cooling phase are proposed. 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Tunneling & Underground Space Technology is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.tust.2022.104838
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      – Code: eng
        Text: English
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        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Redundancy in engineering
        Type: general
      – SubjectFull: Performance technology
        Type: general
      – SubjectFull: Tunnel lining
        Type: general
      – SubjectFull: Fire exposure
        Type: general
      – SubjectFull: Tunnels
        Type: general
      – SubjectFull: Finite element method
        Type: general
    Titles:
      – TitleFull: Study on the effects of cooling phase and construction technology on the fire performance of R/C tunnels.
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            NameFull: LO MONTE, Francesco
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            NameFull: BAMONTE, Patrick
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            NameFull: BELTRAMI, Carlo
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            – D: 01
              M: 02
              Text: Feb2023
              Type: published
              Y: 2023
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              Value: 132
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