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Research on Against Progressive Collapse Mechanism of Conventional Island Main Plant Based on Alternate Path Method.

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Title: Research on Against Progressive Collapse Mechanism of Conventional Island Main Plant Based on Alternate Path Method.
Authors: Qi, Pengfei1 q291990@163.com, Zhao, Wenhao2 zzzwh429@163.com, Pei, Qiang3 peiqiang@dlu.edu.cn, Yu, Ruifang1 yrfang126@126.com, Wu, Cong2 wucong950707@163.com
Source: Engineering Letters. May2026, Vol. 34 Issue 5, p2042-2053. 12p.
Subjects: Progressive collapse, Nuclear power plants, Girders, Earthquake resistant design, Finite element method, Structural analysis (Engineering), Material plasticity
Abstract: The primary structure of a conventional nuclear power plant, classified as a Class III key item, has a complex and irregular layout. This design is prone to progressive collapse in the event of accidents, such as exceeding design limits, which could lead to substantial losses. This article establishes a structural model using SAP2000 finite element software, identifies four types of key column components through the Alternate Path Method, and conducts nonlinear analysis under various analysis cases. A detailed investigation was conducted into the mechanisms against progressive collapse, the redistribution of internal forces, and the development laws of plastic hinges within the remaining structure after the removal of failed columns. The findings revealed that only the beam mechanism was activated when the corner column failed. In contrast, when the center or internal column failed, the beam mechanism was followed by the sequential activation of the catenary mechanism. Throughout the structural progressive collapse process, key internal forces, such as bending moments, are primarily transmitted through the beam components above the failed column, and the development of plastic hinges is highly consistent with the deformation coordination criterion. This study offers essential theoretical support and a quantitative evaluation foundation for the seismic design optimization of conventional island main plants in nuclear power plants. [ABSTRACT FROM AUTHOR]
Copyright of Engineering Letters is the property of International Association of Engineers (IAENG) 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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DbLabel: Engineering Source
An: 193453958
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  Label: Title
  Group: Ti
  Data: Research on Against Progressive Collapse Mechanism of Conventional Island Main Plant Based on Alternate Path Method.
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  Data: <searchLink fieldCode="AR" term="%22Qi%2C+Pengfei%22">Qi, Pengfei</searchLink><relatesTo>1</relatesTo><i> q291990@163.com</i><br /><searchLink fieldCode="AR" term="%22Zhao%2C+Wenhao%22">Zhao, Wenhao</searchLink><relatesTo>2</relatesTo><i> zzzwh429@163.com</i><br /><searchLink fieldCode="AR" term="%22Pei%2C+Qiang%22">Pei, Qiang</searchLink><relatesTo>3</relatesTo><i> peiqiang@dlu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Yu%2C+Ruifang%22">Yu, Ruifang</searchLink><relatesTo>1</relatesTo><i> yrfang126@126.com</i><br /><searchLink fieldCode="AR" term="%22Wu%2C+Cong%22">Wu, Cong</searchLink><relatesTo>2</relatesTo><i> wucong950707@163.com</i>
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  Data: <searchLink fieldCode="JN" term="%22Engineering+Letters%22">Engineering Letters</searchLink>. May2026, Vol. 34 Issue 5, p2042-2053. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Progressive+collapse%22">Progressive collapse</searchLink><br /><searchLink fieldCode="DE" term="%22Nuclear+power+plants%22">Nuclear power plants</searchLink><br /><searchLink fieldCode="DE" term="%22Girders%22">Girders</searchLink><br /><searchLink fieldCode="DE" term="%22Earthquake+resistant+design%22">Earthquake resistant design</searchLink><br /><searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br /><searchLink fieldCode="DE" term="%22Structural+analysis+%28Engineering%29%22">Structural analysis (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Material+plasticity%22">Material plasticity</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The primary structure of a conventional nuclear power plant, classified as a Class III key item, has a complex and irregular layout. This design is prone to progressive collapse in the event of accidents, such as exceeding design limits, which could lead to substantial losses. This article establishes a structural model using SAP2000 finite element software, identifies four types of key column components through the Alternate Path Method, and conducts nonlinear analysis under various analysis cases. A detailed investigation was conducted into the mechanisms against progressive collapse, the redistribution of internal forces, and the development laws of plastic hinges within the remaining structure after the removal of failed columns. The findings revealed that only the beam mechanism was activated when the corner column failed. In contrast, when the center or internal column failed, the beam mechanism was followed by the sequential activation of the catenary mechanism. Throughout the structural progressive collapse process, key internal forces, such as bending moments, are primarily transmitted through the beam components above the failed column, and the development of plastic hinges is highly consistent with the deformation coordination criterion. This study offers essential theoretical support and a quantitative evaluation foundation for the seismic design optimization of conventional island main plants in nuclear power plants. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Engineering Letters is the property of International Association of Engineers (IAENG) 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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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 12
        StartPage: 2042
    Subjects:
      – SubjectFull: Progressive collapse
        Type: general
      – SubjectFull: Nuclear power plants
        Type: general
      – SubjectFull: Girders
        Type: general
      – SubjectFull: Earthquake resistant design
        Type: general
      – SubjectFull: Finite element method
        Type: general
      – SubjectFull: Structural analysis (Engineering)
        Type: general
      – SubjectFull: Material plasticity
        Type: general
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      – TitleFull: Research on Against Progressive Collapse Mechanism of Conventional Island Main Plant Based on Alternate Path Method.
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          Name:
            NameFull: Qi, Pengfei
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            NameFull: Zhao, Wenhao
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            NameFull: Pei, Qiang
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            – D: 01
              M: 05
              Text: May2026
              Type: published
              Y: 2026
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