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首页> 外文期刊>Journal of Composites for Construction >Development of FRP Shear Bolts for Punching Shear Retrofit of Reinforced Concrete Slabs
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Development of FRP Shear Bolts for Punching Shear Retrofit of Reinforced Concrete Slabs

机译：FRP剪力螺栓用于钢筋混凝土板冲剪改造的开发

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A fiber-reinforced polymer (FRP) shear bolt system has been recently developed at the University of Waterloo in Canada. The system is used to protect previously built reinforced concrete (RC) slabs against brittle punching shear failure. The system requires drilling small holes in a RC slab around the perimeter of a column, inserting bolts into the holes, and anchoring the bolts at both external surfaces of the slab. Many existing RC slabs have been built without any shear reinforcement. Also, many of these slabs are in corrosive environments, e.g., parking garages, where the use of deicing salts accelerates reinforcement corrosion and concrete deterioration. Therefore, FRPs are ideal materials to be used for such retrofit. The challenge, however, is the development of mechanical end anchorages for FRP rods that are efficient, aesthetic, cost effective, and that can be installed on site. The research presented in this paper includes development of FRP bolts with mechanical anchorages and the results of testing done using the developed systems. A new anchorage technique for the FRP rods based on crimping the rod ends with the aluminum fittings was developed. The testing was done on isolated slab-column specimens representing interior slab-column connections in a continuous flat plate system. The specimens were subjected to simulated gravity loading. The developed FRP bolts worked very well in improving the performance of the slab-column connections and showing the benefits of using FRP in punching shear retrofit of reinforced concrete slabs in corrosive environments.
机译：加拿大滑铁卢大学最近开发了一种纤维增强聚合物（FRP）剪切螺栓系统。该系统用于保护先前建造的钢筋混凝土（RC）板免遭脆性冲切剪切破坏。该系统要求在圆柱周围的RC板中钻一些小孔，将螺栓插入孔中，然后将螺栓锚定在板的两个外表面上。已经建造了许多现有的RC板而没有任何抗剪加固。而且，这些板中的许多板处于腐蚀性环境中，例如停车场，在其中使用除冰盐会加速钢筋腐蚀和混凝土劣化。因此，玻璃钢是用于此类改造的理想材料。然而，挑战在于开发用于FRP杆的机械端部锚固装置，该机械端部锚固装置高效，美观，具有成本效益并且可以现场安装。本文介绍的研究包括具有机械锚固的FRP螺栓的开发以及使用已开发系统完成的测试结果。开发了一种新的FRP锚固技术，该技术基于将锚固端与铝制配件压接在一起。测试是在连续平板系统中代表内部平板柱连接的孤立平板柱标本上进行的。样品经受了模拟重力加载。所开发的FRP螺栓在改善板-柱连接的性能方面发挥了很好的作用，并显示了在腐蚀环境下使用FRP进行钢筋混凝土板的冲剪改造的优势。

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