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Deterioration of shear behavior of corroded reinforced concrete beams

机译：锈蚀钢筋混凝土梁的抗剪性能劣化

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摘要

Steel bars in reinforced concrete (RC) structures may corrode in an aggressive environment, resulting in performance deterioration and premature failure. Stirrups begin to corrode earlier and faster than longitudinal steel bars due to their thinner concrete cover, and the shear strength decreases faster than the flexural strength. This paper presents an experimental investigation into the deterioration mechanism of shear behavior for corroded RC beams, and the prominent influencing parameters on shear behavior. The impressed current method was used to obtain corroded RC beams with different corrosion degrees in stirrups and longitudinal steel bars. Test results indicated that the beam may fail in shear instead of bending as the degrees of stirrup corrosion increases. The more severe the corrosion of stirrups was, the lower the shear strength. However, as the degree of corrosion increased in the longitudinal steel bars, the failure mode could change back to bending failure. The loss of bond strength affected the shear behavior of corroded RC beams, and the shear strength for bonded specimens was larger than unbonded ones. The shear strength decreased in beams with stirrups lacking end anchorages. Stirrups without end anchorages could still contribute to the shear strength if there was a good bond between stirrups and concrete. Otherwise, the stirrups could be ignored. With neither bond strength nor end anchorage, the beam could be treated as a beam without stirrups.
机译：钢筋混凝土（RC）结构中的钢筋可能会在腐蚀性环境中腐蚀，从而导致性能下降和过早失效。由于其较薄的混凝土覆盖层，箍筋比纵向钢筋开始腐蚀的时间更快，并且抗剪强度的降低速度快于抗弯强度。本文对锈蚀RC梁的剪切性能劣化机理以及影响剪切性能的主要参数进行了实验研究。施加电流法用于获得在箍筋和纵向钢筋中具有不同腐蚀程度的锈蚀RC梁。测试结果表明，随着箍筋腐蚀程度的增加，梁可能会发生剪切破坏而不是弯曲。马rup的腐蚀越严重，剪切强度就越低。但是，随着纵向钢筋中腐蚀程度的增加，破坏模式可能会变回弯曲破坏。粘结强度的损失影响了锈蚀RC梁的剪切性能，粘结试样的剪切强度要比未粘结试样大。在没有端锚的箍筋的梁中，抗剪强度降低。如果箍筋和混凝土之间具有良好的粘结性，则没有末端锚固的箍筋仍可提高剪切强度。否则，箍筋可以忽略。由于既没有粘结强度也没有端部锚固，该梁可以被视为没有箍筋的梁。

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  • 来源
    《Engineering Structures》 |2018年第1期|708-720|共13页
  • 作者

    Ye Zhiwen; Zhang Weiping; Gu Xianglin;

  • 作者单位

    Tongii Univ, Key Lab Performance Evolut & Control Engn Struct, Minist Educ, 1239 Siping Rd, Shanghai 200092, Peoples R China;

    Tongii Univ, Key Lab Performance Evolut & Control Engn Struct, Minist Educ, 1239 Siping Rd, Shanghai 200092, Peoples R China;

    Tongii Univ, Key Lab Performance Evolut & Control Engn Struct, Minist Educ, 1239 Siping Rd, Shanghai 200092, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Reinforced concrete beam; Corrosion; Shear behavior; Failure mode;

    机译：钢筋混凝土梁;腐蚀;剪切性能;破坏模式;

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