金浏, 李平, 杜修力, 李冬. 箍筋约束混凝土圆柱轴压强度尺寸效应律[J]. 工程力学, 2020, 37(5): 64-73. DOI: 10.6052/j.issn.1000-4750.2019.04.0166
引用本文: 金浏, 李平, 杜修力, 李冬. 箍筋约束混凝土圆柱轴压强度尺寸效应律[J]. 工程力学, 2020, 37(5): 64-73. DOI: 10.6052/j.issn.1000-4750.2019.04.0166
JIN Liu, LI Ping, DU Xiu-li, LI Dong. SIZE EFFECT LAW FOR NOMINAL STRENGTH OF STIRRUP-CONFINED CIRCULAR CONCRETE COLUMNS UNDER AXIAL COMPRESSION[J]. Engineering Mechanics, 2020, 37(5): 64-73. DOI: 10.6052/j.issn.1000-4750.2019.04.0166
Citation: JIN Liu, LI Ping, DU Xiu-li, LI Dong. SIZE EFFECT LAW FOR NOMINAL STRENGTH OF STIRRUP-CONFINED CIRCULAR CONCRETE COLUMNS UNDER AXIAL COMPRESSION[J]. Engineering Mechanics, 2020, 37(5): 64-73. DOI: 10.6052/j.issn.1000-4750.2019.04.0166

箍筋约束混凝土圆柱轴压强度尺寸效应律

SIZE EFFECT LAW FOR NOMINAL STRENGTH OF STIRRUP-CONFINED CIRCULAR CONCRETE COLUMNS UNDER AXIAL COMPRESSION

  • 摘要: 钢筋混凝土构件的破坏模式与机制区别并远复杂于混凝土材料,采用混凝土材料层面的尺寸效应理论与公式来描述钢筋混凝土构件破坏的尺寸效应行为是值得商榷的。另外,混凝土材料尺寸效应理论公式难以反映钢筋混凝土结构构件中其他重要参数对尺寸效应的影响。以箍筋约束混凝土圆柱为研究对象来看:结合相关物理试验及数值模拟结果,凝练归纳出了影响其轴压破坏尺寸效应的主导参数——箍筋率;根据箍筋约束作用对柱轴压强度的影响机制与规律,在经典的Bažant材料层次尺寸效应律的基础上,建立了箍筋约束混凝土柱轴压强度的尺寸效应半理论-半经验公式。相关试验及模拟结果验证了该构件层次尺寸效应公式的准确性和合理性。

     

    Abstract: The failure modes and mechanisms of reinforced concrete (RC) members are far different from those of the concrete material. It is therefore debatable to use the size effect theory and formula based on the concrete material to describe the size effect of RC members. Moreover, the size effect formula of the concrete material is difficult to describe the influence of other important structural parameters on the size effect of RC structural members. Taking circular concrete columns confined by stirrups for the research objects, combined with the physical test and numerical results, the main parameter of stirrup ratio that affects the size effect of nominal compressive strength was revealed. Furthermore, combined with the influence mechanism of the confining effect on the axial compressive strength of RC columns and based on the basic theory of the Size Effect Law (SEL) proposed by Bažant, a semi-theoretical and semi-empirical formula for the size effect of the uniaxial compressive strength of stirrup-confined RC columns was established. The experimental and numerical results in the present study as well as other experimental data verify the accuracy and rationality of thesemi-theoretical and semiempirical formula of the size effect on the RC member level.

     

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