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Flexural behavior and size effect of normal-strength RC columns under monotonic horizontal loading

机译：单调水平荷载作用下正强度钢筋混凝土柱的抗弯性能及尺寸效应

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摘要

In this study, a total of six geometrically similar normal-strength RC columns of different structural sizes (in the ratio 3:5:7) and axial compression ratios (0.4 and 0.6) were tested to investigate the flexural behavior and size effect, where the cross-sectional sizes of the columns ranged from 300 mm to 700 mm, and the shear-span ratio was 4. The experimental results indicate that the size effects in the flexural behavior of RC columns under monotonic horizontal loading were obvious, including the bearing capacity of specimens and their ductility, and the compression strain on the concrete, which decreased with increasing cross-sectional height. The larger the axial compression ratio, the more obvious the size effect of the bending bearing capacity and ultimate compression strain of the concrete. When the axial compressive ratio was small, the size effect of ductility was more pronounced. However, the assumption of a plane section still held for large-scale specimens, which is an indication of no size effect. Moreover, there was no obvious size effect in the failure patterns besides an increase in the crack width with cross-sectional size. According to the test results, a size-related model that considered the strength coefficient at was established to estimate the bending bearing capacity of RC columns, and there was good agreement between the model and experimental results. We found that a bi-logarithmic plot of the strength coefficient a(1) closely followed the "size effect law" proposed by Bazant.
机译：在这项研究中，总共测试了六种不同结构尺寸（以3：5：7的比率）和轴向压缩比（0.4和0.6）的几何相似的法向强度RC柱，以研究挠曲行为和尺寸效应，其中柱的横截面尺寸为300 mm至700 mm，剪切跨度比为4。实验结果表明，在单调水平荷载下，RC柱的抗弯性能的尺寸效应是明显的，包括轴承试件的能力，延性以及混凝土的压缩应变随截面高度的增加而减小。轴向压缩比越大，混凝土的抗弯承载力和极限压缩应变的尺寸效应越明显。当轴向压缩比小时，延展性的尺寸效应更加明显。但是，对于大型样本，仍然保留平面截面的假设，这表明没有尺寸效应。此外，除了裂纹宽度随横截面尺寸的增加外，在破坏模式中没有明显的尺寸效应。根据测试结果，建立了一个考虑强度系数的尺寸相关模型来估算RC柱的抗弯承载力，该模型与实验结果吻合良好。我们发现强度系数a（1）的双对数图严格遵循Bazant提出的“尺寸效应定律”。

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  • 来源
    《Engineering Structures》 |2018年第1期|251-262|共12页
  • 作者

    Xie Yongping; Li Zhenbao; Jia Lei; Zhou Hongyu; Bai Wenting; Li Yuan;

  • 作者单位

    HeBei GEO Univ, Coll Explorat Technol & Engn, Shijiazhuang 050031, Hebei, Peoples R China;

    Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China;

    HeBei GEO Univ, Coll Explorat Technol & Engn, Shijiazhuang 050031, Hebei, Peoples R China;

    Beijing Univ Technol, Key Lab Urban Secur & Disaster Engn, Minist Educ, Beijing 100124, Peoples R China;

    HeBei GEO Univ, Coll Explorat Technol & Engn, Shijiazhuang 050031, Hebei, Peoples R China;

    HeBei GEO Univ, Coll Explorat Technol & Engn, Shijiazhuang 050031, Hebei, 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 column; Monotonic horizontal loading; Flexural behavior; Size effect; Bending bearing capacity;

    机译：钢筋混凝土柱;单调水平荷载;抗弯性能;尺寸效应;弯曲承载力;

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