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Analytical model for the capacity of compressive arch action of reinforced concrete sub-assemblages

机译:钢筋混凝土子组合件的压缩拱作用能力分析模型

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摘要

Compressive arch action (CAA) is a favourable structural mechanism to mitigate progressive collapse of reinforced concrete (RC) frames. To quickly and accurately predict the CAA capacity of RC sub-assemblages under a column-missing scenario, an engineering analytical model is proposed. The model considers all the design parameters in beams and the imperfect boundary conditions of sub-assemblages, including partial axial and rotational restraints, and connection gaps at beam ends if any. The proposed model is then validated with experimental results and extended to calculate progressive collapse resistance due to CAA with dynamic increase factors. Finally, the model is employed in parametric studies. It is found that CAA capacity increases with restraint stiffness only in the regime of weak restraints; in the regime of strong restraints, CAA capacity is not sensitive to variation in restraint stiffness. Furthermore, CAA enhances structural resistance more evidently for sub-assemblages with small span-to-depth ratios and low mechanical reinforcement ratios, and RC slabs help to increase the CAA capacities of RC frames.
机译:压拱作用(CAA)是减轻钢筋混凝土(RC)框架逐渐倒塌的有利结构机制。为了快速准确地预测在缺少列情况下钢筋混凝土组件的CAA能力,提出了一种工程分析模型。该模型考虑了梁中的所有设计参数以及子组件的不完美边界条件,包括部分轴向和旋转约束以及梁端的连接间隙(如果有)。然后,用实验结果验证了提出的模型,并扩展了该模型,以计算具有动态增加因子的CAA引起的渐进式抗倒塌能力。最后,该模型用于参数研究。发现仅在弱约束条件下,CAA容量随约束刚度的增加而增加。在强约束条件下,CAA能力对约束刚度的变化不敏感。此外,对于跨距-深度比小和机械增强率低的子组件,CAA更加明显地增强了结构阻力,RC平板有助于增加RC框架的CAA能力。

著录项

  • 来源
    《Magazine of Concrete Research》 |2014年第4期|109-126|共18页
  • 作者

    Jun Yu; Kang Hai Tan;

  • 作者单位

    College of Civil and Transportation Engineering, Hohai University, Nanjing, China;

    School of Civil & Environmental Engineering, Nanyang Technological University, Singapore;

  • 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

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