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    Stress Distribution in Concrete with Nonuniform Passive FRP Confinement

    Source: Journal of Composites for Construction:;2024:;Volume ( 028 ):;issue: 006::page 04024052-1
    Author:
    Peng-Da Li
    ,
    Si-Jie Gao
    ,
    Yu-Fei Wu
    DOI: 10.1061/JCCOF2.CCENG-4727
    Publisher: American Society of Civil Engineers
    Abstract: Understanding the stress distribution within concrete structures under complex loading conditions is crucial for investigating their failure mechanisms and ultimate strength design. Nevertheless, internal-stress distribution measurements in concrete are very challenging. This study addresses this issue by employing an innovative pressure mapping sensor to directly measure the axial stress distribution in concrete subjected to both uniform and nonuniform confining stresses. These different confinement conditions were achieved by applying fiber-reinforced polymer jackets to concrete specimens with various cross-sectional shapes. The obtained stress patterns reveal that the stress distribution within concrete depends not only on the instantaneous confining stress field but also on the stress path applied to concrete. In situations of inadequate confinement, stress concentration within an effectively confined area results in premature and severe damage, which subsequently leads to that concrete within the ineffective confinement region playing a major role in stress resistance, exhibiting a higher axial stress distribution. This finding contradicts the widely accepted notion that high stress always occurs in the effective confinement area. A series of local stress–strain curves corresponding to effective and ineffective confinement areas were also obtained, providing insights into the variation in load resistance contribution during the loading process. Furthermore, a comparison between test data and finite-element analysis results exposes disparities in the predicted stress distribution, underscoring limitations in the employed capacity of the concrete plastic-damage model to simulate concrete heterogeneity and its damage process under weak confinement. The stress distribution data presented in this study hold critical significance for comprehending concrete material failure mechanisms, advancing constitutive theories, and establishing corresponding mechanical models.
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      Stress Distribution in Concrete with Nonuniform Passive FRP Confinement

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    contributor authorPeng-Da Li
    contributor authorSi-Jie Gao
    contributor authorYu-Fei Wu
    date accessioned2025-04-20T10:05:33Z
    date available2025-04-20T10:05:33Z
    date copyright8/22/2024 12:00:00 AM
    date issued2024
    identifier otherJCCOF2.CCENG-4727.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4303969
    description abstractUnderstanding the stress distribution within concrete structures under complex loading conditions is crucial for investigating their failure mechanisms and ultimate strength design. Nevertheless, internal-stress distribution measurements in concrete are very challenging. This study addresses this issue by employing an innovative pressure mapping sensor to directly measure the axial stress distribution in concrete subjected to both uniform and nonuniform confining stresses. These different confinement conditions were achieved by applying fiber-reinforced polymer jackets to concrete specimens with various cross-sectional shapes. The obtained stress patterns reveal that the stress distribution within concrete depends not only on the instantaneous confining stress field but also on the stress path applied to concrete. In situations of inadequate confinement, stress concentration within an effectively confined area results in premature and severe damage, which subsequently leads to that concrete within the ineffective confinement region playing a major role in stress resistance, exhibiting a higher axial stress distribution. This finding contradicts the widely accepted notion that high stress always occurs in the effective confinement area. A series of local stress–strain curves corresponding to effective and ineffective confinement areas were also obtained, providing insights into the variation in load resistance contribution during the loading process. Furthermore, a comparison between test data and finite-element analysis results exposes disparities in the predicted stress distribution, underscoring limitations in the employed capacity of the concrete plastic-damage model to simulate concrete heterogeneity and its damage process under weak confinement. The stress distribution data presented in this study hold critical significance for comprehending concrete material failure mechanisms, advancing constitutive theories, and establishing corresponding mechanical models.
    publisherAmerican Society of Civil Engineers
    titleStress Distribution in Concrete with Nonuniform Passive FRP Confinement
    typeJournal Article
    journal volume28
    journal issue6
    journal titleJournal of Composites for Construction
    identifier doi10.1061/JCCOF2.CCENG-4727
    journal fristpage04024052-1
    journal lastpage04024052-17
    page17
    treeJournal of Composites for Construction:;2024:;Volume ( 028 ):;issue: 006
    contenttypeFulltext
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