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Theoretical Analysis on Mechanical Behavior of Axially Loaded Recycled Aggregate Concrete Filled Steel Tubes

机译：钢管轴向再生骨料混凝土力学性能的理论分析。

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摘要

A new mechanical model for analysing the behaviour of axially loaded recycled aggregate concrete filled steel tubes (RACFSTs) stub columns is presented in this study. The model is derived from the typical elastoplasticity, the nonlinear elastic mechanics, and the properties of materials. Based on the mechanical model, a novel numerical program is developed. The mechanical model and the numerical program are adopted to study the effect of recycled coarse aggregate (RCA) replacement percentage on RACFST mechanical behaviour. The complete load-deformation relationship of specimens, the steel tube axial and circumferential stresses, and the performance of the confined core concrete and the variation of interaction are also investigated. The analytical results indicate that this model is able to capture the mechanical behaviour of RACFST. It is also found that the axial and circumferential stresses of steel tube change nonlinearly during the loading stages. It is concluded that the behaviour of the confined core concrete is significantly influenced by the confining pressure. The steel tube confinement could improve the mechanical behaviour of RAC effectively and the RCA replacement percentage slightly changes the response of core concrete. Finally, the relations between confined core concrete and confining pressure are analysed.
机译：本研究提出了一种新的力学模型，用于分析轴向加载的再生骨料填充钢管（RACFSTs）短柱的性能。该模型源自典型的弹塑性，非线性弹性力学和材料特性。基于力学模型，开发了一种新颖的数值程序。采用力学模型和数值程序研究了再生粗骨料（RCA）替代百分率对RACFST机械性能的影响。还研究了试件的完整的载荷-变形关系，钢管的轴向和周向应力，承压芯混凝土的性能以及相互作用的变化。分析结果表明，该模型能够捕获RACFST的力学行为。还发现钢管的轴向和周向应力在加载阶段是非线性的。得出的结论是，承压条件对承压芯混凝土的性能有很大影响。钢管约束可以有效地改善RAC的力学性能，RCA置换百分比会稍微改变核心混凝土的响应。最后，分析了承压核心混凝土与承压之间的关系。

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  • 来源
    《Mathematical Problems in Engineering》 |2015年第18期|270469.1-270469.14|共14页
  • 作者

    Huang Yijie; Sun Yuedong; Sun Huangsheng; Wang Qing;

  • 作者单位

    Shandong Univ Sci & Technol, Dept Civil Engn, Econ & Tech Dev Zone, Qingdao 266510, Peoples R China.;

    Shandong Univ Sci & Technol, Dept Civil Engn, Econ & Tech Dev Zone, Qingdao 266510, Peoples R China.;

    Shandong Univ Sci & Technol, Dept Civil Engn, Econ & Tech Dev Zone, Qingdao 266510, Peoples R China.;

    Shandong Univ Sci & Technol, Dept Civil Engn, Econ & Tech Dev Zone, Qingdao 266510, Peoples R China.;

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