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Moment redistribution capacity in prestressed concrete continuous beams.

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Title: Moment redistribution capacity in prestressed concrete continuous beams.
Authors: Luo, Da1 (AUTHOR), Li, Bing2 (AUTHOR) cbli@ntu.edu.sg
Source: Magazine of Concrete Research. Dec2024, Vol. 76 Issue 23, p1343-1355. 13p.
Subjects: Elastic analysis (Engineering), Concrete beams, Reinforced concrete, Prestressed concrete beams, Tendons, Concrete
Abstract: In prestressed concrete continuous beams, building code provisions often allow for a reduction in the moment at a critical section (calculated through elastic analysis). This reduction is permitted as long as the moments in all other sections are adjusted to maintain equilibrium and support the designated loads. However, the allowable moment redistribution percentage (MRP) for prestressed concrete beams (PCBs) remains a topic of debate. Many codes currently assign a similar MRP limitation to both PCBs and reinforced concrete beams (RCBs). This approach might be over-simplistic for PCBs due to their unique behaviour. A method for identifying the maximum available MRP is proposed in this article. An in-depth study was conducted on the maximum available MRP of PCBs based on calibrated finite-element models. The results showed that parameters such as the passive reinforcement ratio, steel yield strength, slenderness ratio, eccentricity of prestressing tendons, concrete grade and load pattern, which are not considered in the codes, influence the maximum available MRP to an extent. Using the same permissible MRP as RCBs may thus be inappropriate. An equation is proposed to estimate the maximum available MRP for PCBs. [ABSTRACT FROM AUTHOR]
Copyright of Magazine of Concrete Research is the property of Emerald Publishing Limited 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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PubType: Academic Journal
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  Data: <searchLink fieldCode="JN" term="%22Magazine+of+Concrete+Research%22">Magazine of Concrete Research</searchLink>. Dec2024, Vol. 76 Issue 23, p1343-1355. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Elastic+analysis+%28Engineering%29%22">Elastic analysis (Engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Concrete+beams%22">Concrete beams</searchLink><br /><searchLink fieldCode="DE" term="%22Reinforced+concrete%22">Reinforced concrete</searchLink><br /><searchLink fieldCode="DE" term="%22Prestressed+concrete+beams%22">Prestressed concrete beams</searchLink><br /><searchLink fieldCode="DE" term="%22Tendons%22">Tendons</searchLink><br /><searchLink fieldCode="DE" term="%22Concrete%22">Concrete</searchLink>
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  Data: In prestressed concrete continuous beams, building code provisions often allow for a reduction in the moment at a critical section (calculated through elastic analysis). This reduction is permitted as long as the moments in all other sections are adjusted to maintain equilibrium and support the designated loads. However, the allowable moment redistribution percentage (MRP) for prestressed concrete beams (PCBs) remains a topic of debate. Many codes currently assign a similar MRP limitation to both PCBs and reinforced concrete beams (RCBs). This approach might be over-simplistic for PCBs due to their unique behaviour. A method for identifying the maximum available MRP is proposed in this article. An in-depth study was conducted on the maximum available MRP of PCBs based on calibrated finite-element models. The results showed that parameters such as the passive reinforcement ratio, steel yield strength, slenderness ratio, eccentricity of prestressing tendons, concrete grade and load pattern, which are not considered in the codes, influence the maximum available MRP to an extent. Using the same permissible MRP as RCBs may thus be inappropriate. An equation is proposed to estimate the maximum available MRP for PCBs. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Magazine of Concrete Research is the property of Emerald Publishing Limited 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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        Value: 10.1680/jmacr.24.00138
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 1343
    Subjects:
      – SubjectFull: Elastic analysis (Engineering)
        Type: general
      – SubjectFull: Concrete beams
        Type: general
      – SubjectFull: Reinforced concrete
        Type: general
      – SubjectFull: Prestressed concrete beams
        Type: general
      – SubjectFull: Tendons
        Type: general
      – SubjectFull: Concrete
        Type: general
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      – TitleFull: Moment redistribution capacity in prestressed concrete continuous beams.
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            NameFull: Luo, Da
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            – D: 01
              M: 12
              Text: Dec2024
              Type: published
              Y: 2024
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