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Behaviors of Large-Rupture-Strain Fiber-Reinforced Polymer Strengthened Reinforced Concrete Beams Under Static and Impact Loads
Frontiers in Materials ( IF 2.6 ) Pub Date : 2020-09-23 , DOI: 10.3389/fmats.2020.578749
Zenghui Ye , Debo Zhao , Lili Sui , Zhenyu Huang , Xiaoqing Zhou

Reinforced concrete (RC) structures may be damaged seriously when subjected to impact loading, and it is necessary to strengthen existing structures to improve their impact resistance. Large-rupture-strain fiber-reinforced polymer (LRS-FRP) is a promising material to strengthen RC structures under impact because of its good deformation capacity. This article shows experimental studies on performance of LRS-FRP strengthened RC beams under static and impact loads. The effects of FRP types, loading rate, and the usage or nonusage of end-anchorages on the strengthening efficiency were investigated. The experiment demonstrates LRS-FRP laminate with end-anchorage (EA) to be an appropriate strengthening technique for RC beams under both static and impact loading. The beams strengthened with end-anchored LRS-FRP presented greater ductility than their carbon fiber-reinforced polymer counterpart under static loading, and the end-anchored LRS-FRP strengthening system reduced the maximum deflection and damage of strengthened beam under impact significantly. However, the end-anchorage was more susceptible to damage and failure when the loading rate increased from static to impact. Therefore, the end-anchorage and the end-anchorage-FRP connection should be designed with caution for impact condition.



中文翻译:

静态和冲击载荷下大断裂应变纤维增强聚合物增强钢筋混凝土梁的性能

钢筋混凝土(RC)结构在受到冲击载荷时可能会受到严重破坏,因此有必要加强现有结构以提高其抗冲击性。大断裂应变纤维增强聚合物(LRS-FRP)由于其良好的变形能力,是一种在受到冲击时增强RC结构的有前途的材料。本文显示了在静态和冲击载荷下对LRS-FRP增强的RC梁性能的实验研究。研究了玻璃钢类型,荷载率以及端锚的使用或不使用对加固效率的影响。实验表明,带有端部锚固(EA)的LRS-FRP层压板是在静载荷和冲击载荷下对RC梁进行加固的合适技术。端部锚固的LRS-FRP加固的梁在静载荷下比碳纤维增强的聚合物梁具有更好的延展性,端部锚固的LRS-FRP加固系统显着降低了受冲击时加固梁的最大挠度和破坏。但是,当加载速率从静态增加到冲击时,端部锚固更容易受到破坏和破坏。因此,在设计末端锚固和末端锚固-FRP连接时应谨慎考虑撞击条件。当加载速率从静态增加到冲击时,锚固端更容易受到破坏和破坏。因此,在设计锚固端和锚固-FRP连接时应谨慎考虑冲击条件。当加载速率从静态增加到冲击时,锚固端更容易受到破坏和破坏。因此,在设计锚固端和锚固-FRP连接时应谨慎考虑冲击条件。

更新日期:2020-11-06
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