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Shear strength of interior beam-column joints with lightweight aggregate concrete

机译:轻骨料混凝土内部梁柱节点的抗剪强度

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摘要

Lightweight aggregate concrete (LWAC) elements can effectively reduce dead load and improve the seismic resistance capacity of building structures. However, the shear performance of LWAC remains questionable due to its specific brittle failure mechanism. In this work, four one-third-scale LWAC interior beam-column joints were prepared and tested under reversed quasi-static cyclic loading. Two levels of axial compressive forces and joint transverse reinforcement ratios were considered for each specimen to quantify and analyse the shear performance of LWAC joints. The test results indicate that all LWAC specimens experienced shear failure at the joint core and presented satisfactory shear resistance capacity in terms of shear strength, displacement ductility, stiffness degradation and energy dissipation compared to normal-weight concrete (NWC) specimens. The test results were used to examine the applicability and accuracy of six shear design models based on the behaviour of NWC elements for LWAC beam-column joints. A comparison of the results indicated that there is no apparent difference between the ultimate shear strengths of LWAC and NWC specimens, and all six previously proposed shear equations examined can accurately predict the ultimate shear strength of LWAC interior beam-column joints.
机译:轻集料混凝土(LWAC)元素可以有效减少静载并提高建筑结构的抗震能力。然而,由于其特殊的脆性破坏机理,LWAC的剪切性能仍然值得怀疑。在这项工作中,准备了四个三分之一比例的LWAC内部梁柱节点,并在反向准静态循环荷载下对其进行了测试。对于每个样本,考虑了两个水平的轴向压缩力和接头横向加强比,以量化和分析LWAC接头的剪切性能。测试结果表明,与普通重量混凝土(NWC)试样相比,所有LWAC试样在接缝芯处均经历了剪切破坏,并在剪切强度,位移延展性,刚度降低和能量耗散方面表现出令人满意的抗剪切能力。基于NW单元在LWAC梁柱节点处的行为,测试结果用于检验六个剪切设计模型的适用性和准确性。结果的比较表明,LWAC和NWC试样的极限抗剪强度之间没有明显差异,并且所有先前提出的六个剪切方程都可以准确地预测LWAC内梁-柱节点的极限抗剪强度。

著录项

  • 来源
    《Magazine of Concrete Research》 |2018年第4期|109-128|共20页
  • 作者

    Wu Tao; Wei Hui; Liu Xi;

  • 作者单位

    Changan Univ, Sch Civil Engn, Xian, Shaanxi, Peoples R China;

    Changan Univ, Sch Civil Engn, Xian, Shaanxi, Peoples R China;

    Changan Univ, Sch Civil Engn, Xian, Shaanxi, 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

    joints; lightweight concrete; shear;

    机译:接头;轻质混凝土;剪切;
  • 入库时间 2022-08-18 00:16:30

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