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Experimental study on shear performance of reinforced concrete beams under fire conditions.

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Title: Experimental study on shear performance of reinforced concrete beams under fire conditions.
Authors: Meng, Weihao1 (AUTHOR), Fu, Chuanguo1 (AUTHOR) fcguo@sdjzu.edu.cn, Wang, Yunxing1,2 (AUTHOR) z2016011@sdaeu.edu.cn, Song, Yamin3 (AUTHOR), Yin, Ankang1 (AUTHOR), Chen, Xinyao1 (AUTHOR)
Source: Advances in Structural Engineering. Jan2026, Vol. 29 Issue 1, p176-196. 21p.
Subjects: Concrete beams, Fire testing, Mechanical behavior of materials, Dead loads (Mechanics), Strains & stresses (Mechanics), Shear strength, High temperatures
Abstract: To investigate the shear performance of reinforced concrete (RC) beams under thermo-mechanical coupling, eight full-scale simply supported RC beam specimens were designed and fabricated based on the 'strong bending and weak shear' principle. A four-point concentrated loading at the top of the beam method was employed to simulate uniform loading, and static load tests were conducted on two specimens at the ambient temperature. Subsequently, utilizing a large-scale fire simulation test system, the remaining six beams were subjected to fire resistance tests under combined high-temperature and uniform loading, considering the influence of varying load ratios. Test results revealed that both RC beams with and without stirrups exhibited shear failure under static loading at ambient temperature. Under thermo-mechanical coupling, the simply supported beams without stirrups exhibited distinct shear failure characteristics upon reaching their fire-resistance limits. Furthermore, the combined effect of the dowel forces generated by the longitudinal reinforcement bridging the primary inclined cracks and the elevated temperatures led to severe splitting failure of the concrete cover along the longitudinal reinforcement. In contrast, beams with stirrups did not exhibit significant shear failure but showed fully developed flexural cracks and pronounced bending deformation, indicating a shear-flexure failure mode. The findings demonstrate that the load ratio has a major impact on the fire-resistance limit of RC beams with and without stirrups. As the load ratio increased, the measured fire-resistance limit decreased. The fire-resistance limit of beams with stirrups decreased linearly with increasing load ratios, while that of beams without stirrups followed a nonlinear trend. At lower load ratios, the rate of decrease was relatively low, whereas at higher load ratios, it became considerably larger. [ABSTRACT FROM AUTHOR]
Copyright of Advances in Structural Engineering is the property of Sage Publications Inc. 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.)
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  Data: Experimental study on shear performance of reinforced concrete beams under fire conditions.
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  Data: <searchLink fieldCode="AR" term="%22Meng%2C+Weihao%22">Meng, Weihao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fu%2C+Chuanguo%22">Fu, Chuanguo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fcguo@sdjzu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Yunxing%22">Wang, Yunxing</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> z2016011@sdaeu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Song%2C+Yamin%22">Song, Yamin</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Yin%2C+Ankang%22">Yin, Ankang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Xinyao%22">Chen, Xinyao</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Advances+in+Structural+Engineering%22">Advances in Structural Engineering</searchLink>. Jan2026, Vol. 29 Issue 1, p176-196. 21p.
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  Data: <searchLink fieldCode="DE" term="%22Concrete+beams%22">Concrete beams</searchLink><br /><searchLink fieldCode="DE" term="%22Fire+testing%22">Fire testing</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+behavior+of+materials%22">Mechanical behavior of materials</searchLink><br /><searchLink fieldCode="DE" term="%22Dead+loads+%28Mechanics%29%22">Dead loads (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink><br /><searchLink fieldCode="DE" term="%22Shear+strength%22">Shear strength</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: To investigate the shear performance of reinforced concrete (RC) beams under thermo-mechanical coupling, eight full-scale simply supported RC beam specimens were designed and fabricated based on the 'strong bending and weak shear' principle. A four-point concentrated loading at the top of the beam method was employed to simulate uniform loading, and static load tests were conducted on two specimens at the ambient temperature. Subsequently, utilizing a large-scale fire simulation test system, the remaining six beams were subjected to fire resistance tests under combined high-temperature and uniform loading, considering the influence of varying load ratios. Test results revealed that both RC beams with and without stirrups exhibited shear failure under static loading at ambient temperature. Under thermo-mechanical coupling, the simply supported beams without stirrups exhibited distinct shear failure characteristics upon reaching their fire-resistance limits. Furthermore, the combined effect of the dowel forces generated by the longitudinal reinforcement bridging the primary inclined cracks and the elevated temperatures led to severe splitting failure of the concrete cover along the longitudinal reinforcement. In contrast, beams with stirrups did not exhibit significant shear failure but showed fully developed flexural cracks and pronounced bending deformation, indicating a shear-flexure failure mode. The findings demonstrate that the load ratio has a major impact on the fire-resistance limit of RC beams with and without stirrups. As the load ratio increased, the measured fire-resistance limit decreased. The fire-resistance limit of beams with stirrups decreased linearly with increasing load ratios, while that of beams without stirrups followed a nonlinear trend. At lower load ratios, the rate of decrease was relatively low, whereas at higher load ratios, it became considerably larger. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Advances in Structural Engineering is the property of Sage Publications Inc. 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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      – Type: doi
        Value: 10.1177/13694332251344658
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 21
        StartPage: 176
    Subjects:
      – SubjectFull: Concrete beams
        Type: general
      – SubjectFull: Fire testing
        Type: general
      – SubjectFull: Mechanical behavior of materials
        Type: general
      – SubjectFull: Dead loads (Mechanics)
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
      – SubjectFull: Shear strength
        Type: general
      – SubjectFull: High temperatures
        Type: general
    Titles:
      – TitleFull: Experimental study on shear performance of reinforced concrete beams under fire conditions.
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            NameFull: Meng, Weihao
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            NameFull: Fu, Chuanguo
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            NameFull: Wang, Yunxing
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            NameFull: Song, Yamin
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            – D: 01
              M: 01
              Text: Jan2026
              Type: published
              Y: 2026
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