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首页> 外文期刊>Journal of structural engineering >Progressive Collapse Resistance of Emulative Precast Concrete Frames with Various Reinforcing Details
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Progressive Collapse Resistance of Emulative Precast Concrete Frames with Various Reinforcing Details

机译：仿真预制混凝土框架具有各种增强细节的渐进塌陷性

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摘要

In this paper, three precast concrete (PC) frames and one cast-in-situ reinforced-concrete (RC) frame were cast and tested to investigate the load-resisting mechanisms of emulative PC frames with various reinforcing details to resist progressive collapse. In the beams of PC frames, the top reinforcement was continuous without curtailment while the bottom reinforcement had different anchorage strength. Test results indicated that, in the event of middle column removal, similar to RC frame, beam action, compressive arch action (CAA), and tensile catenary action (TCA) could be developed sequentially in PC frames with emulative connections, PC frames with sufficient anchorage strength or additional bottom U-shaped bars passing through the middle joint could obtain similar level of CAA capacity as RC frame. However, they may achieve relatively lower TCA capacity due to higher bond strength between the top reinforcement and cast-in-situ topping layer in beams, owing to higher concrete strength in the topping layer, resulting in earlier fracture of the beam top reinforcements. Conversely, PC frames with insufficient anchorage could achieve comparable TCA capacity as RC frame. However, their CAA capacity was less than that of RC frames due to pulling-out failure of bottom reinforcements, preventing further development of strain hardening at beam action and CAA stages. Based on test results and analytical studies, it was found that, similar to RC frames, PC frames with emulative connections could provide sufficient rotational capacity to ensure development of tie-force as required by the design guidelines. (C) 2021 American Society of Civil Engineers.
机译：在本文中，铸造了三个预制混凝土（PC）框架和一个铸造型加强混凝土（RC）框架，并测试了仿真PC帧的负载抵抗机制，具有各种增强细节来抵抗逐渐崩溃。在PC框架的光束中，顶部加强件在没有缩小的情况下连续，而底部加强件具有不同的锚固强度。测试结果表明，在中间列去除的情况下，类似于RC帧，光束动作，压缩弓动作（CAA）和拉伸围绕动作（TCA）可以在具有仿真连接的PC帧中顺序地开发，PC帧充足通过中间接头的锚固强度或额外的底部U形棒可以获得与RC框架相似的CAA容量水平。然而，由于顶部层中的顶部加强和原位顶部顶层之间的更高的粘合强度，它们可以实现相对较低的TCA容量，由于顶部层中的更高的混凝土强度，导致梁顶部增强件的早期骨折。相反，锚固不足的PC帧可以实现与RC帧相当的TCA容量。然而，由于底部增强件的拉出失效，它们的CAA容量小于RC帧的容量，防止在梁作用和CAA阶段进一步发展应变硬化。基于测试结果和分析研究，发现类似于RC帧，具有仿真连接的PC帧可以提供足够的旋转能力，以确保根据设计指南要求的连接力的发展。 （c）2021年美国土木工程师协会。

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  • 来源
    《Journal of structural engineering》 |2021年第8期|04021107.1-04021107.11|共11页
  • 作者

    Qian Kai; Liang Shi-Lin; Fu Feng; Li Yi;

  • 作者单位

    Guilin Univ Technol Coll Civil Engn & Architecture Guilin 541004 Peoples R China|Guangxi Univ Coll Civil Engn & Architecture Nanning 530004 Peoples R China;

    Guangxi Univ Coll Civil Engn & Architecture Nanning 530004 Peoples R China;

    City Univ London Sch Math Comp Sci & Engn Struct Engn London EC1V 0HB England;

    Beijing Univ Technol Key Lab Urban Secur & Disaster Engn Minist Educ Beijing 1000124 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Progressive collapse; Precast concrete; Emulative connection; Experimental tests;

    机译：渐进式崩溃;预制混凝土;仿真连接;实验测试;

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