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Computational study on prestressed concrete members exposed to natural fires.

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Title: Computational study on prestressed concrete members exposed to natural fires.
Authors: Bamonte, Patrick1 patrick.bamonte@polimi.it, Kalaba, Nataša1, Felicetti, Roberto1
Source: Fire Safety Journal. Apr2018, Vol. 97, p54-65. 12p.
Subjects: Fire, Cooling, Loading & unloading, Temperature, Bending (Metalwork)
Abstract: The present paper is aimed at investigating the structural behaviour in bending of prestressed concrete members exposed to natural fires, i.e. fires with a heating and a cooling phase. The fire scenarios considered are characterized by a heating phase that coincides with the ISO834 standard fire and a linear cooling branch. To accurately track the structural behaviour, the usual constitutive models for concrete, ordinary and prestressing steel at high temperature are adapted to account for the different behaviour of the materials upon unloading and cooling. Parametric analyses are carried out on typical prestressed sections (an I-girder and a double-tee), in order to highlight the detrimental effect of longer fire durations (up to 120 min) and lower cooling rates (3 °C/min) as well as the variability of the structural behaviour with the variation of the load level. The results show that in members characterized by massive sections (I-girder in the present study) and exposed to natural fires, limiting the attention to the heating phase is not sufficient, as the maximum temperature in the prestressing steel may be reached long (even hours) after the onset of cooling (in accordance with tests reported in the literature), leading to delayed failure. Moreover, within the range of variation of the cooling rate (3–10 °C/min, ranging from slow to fast cooling) and load level (M/M u  = 0.15–0.30, ranging from low to high load ratio), the structural behaviour exhibits significant variations in the cooling phase of the fire, from an almost complete recovery of the initial configuration to runaway failure. [ABSTRACT FROM AUTHOR]
Copyright of Fire Safety Journal is the property of Elsevier B.V. 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
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Header DbId: egs
DbLabel: Engineering Source
An: 129682863
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Computational study on prestressed concrete members exposed to natural fires.
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  Data: <searchLink fieldCode="JN" term="%22Fire+Safety+Journal%22">Fire Safety Journal</searchLink>. Apr2018, Vol. 97, p54-65. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Fire%22">Fire</searchLink><br /><searchLink fieldCode="DE" term="%22Cooling%22">Cooling</searchLink><br /><searchLink fieldCode="DE" term="%22Loading+%26+unloading%22">Loading & unloading</searchLink><br /><searchLink fieldCode="DE" term="%22Temperature%22">Temperature</searchLink><br /><searchLink fieldCode="DE" term="%22Bending+%28Metalwork%29%22">Bending (Metalwork)</searchLink>
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  Label: Abstract
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  Data: The present paper is aimed at investigating the structural behaviour in bending of prestressed concrete members exposed to natural fires, i.e. fires with a heating and a cooling phase. The fire scenarios considered are characterized by a heating phase that coincides with the ISO834 standard fire and a linear cooling branch. To accurately track the structural behaviour, the usual constitutive models for concrete, ordinary and prestressing steel at high temperature are adapted to account for the different behaviour of the materials upon unloading and cooling. Parametric analyses are carried out on typical prestressed sections (an I-girder and a double-tee), in order to highlight the detrimental effect of longer fire durations (up to 120 min) and lower cooling rates (3 °C/min) as well as the variability of the structural behaviour with the variation of the load level. The results show that in members characterized by massive sections (I-girder in the present study) and exposed to natural fires, limiting the attention to the heating phase is not sufficient, as the maximum temperature in the prestressing steel may be reached long (even hours) after the onset of cooling (in accordance with tests reported in the literature), leading to delayed failure. Moreover, within the range of variation of the cooling rate (3–10 °C/min, ranging from slow to fast cooling) and load level (M/M u  = 0.15–0.30, ranging from low to high load ratio), the structural behaviour exhibits significant variations in the cooling phase of the fire, from an almost complete recovery of the initial configuration to runaway failure. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Fire Safety Journal is the property of Elsevier B.V. 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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      – Type: doi
        Value: 10.1016/j.firesaf.2018.02.006
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 54
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      – SubjectFull: Fire
        Type: general
      – SubjectFull: Cooling
        Type: general
      – SubjectFull: Loading & unloading
        Type: general
      – SubjectFull: Temperature
        Type: general
      – SubjectFull: Bending (Metalwork)
        Type: general
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      – TitleFull: Computational study on prestressed concrete members exposed to natural fires.
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            NameFull: Kalaba, Nataša
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              M: 04
              Text: Apr2018
              Type: published
              Y: 2018
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              Value: 97
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