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首页> 外文期刊>Engineering failure analysis >Experimental study of retrofitted reinforced concrete shear wall and concrete-encased steel girders using a new CarbonFlex composite for damage stabilization
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Experimental study of retrofitted reinforced concrete shear wall and concrete-encased steel girders using a new CarbonFlex composite for damage stabilization

机译：使用新型CarbonFlex复合材料加固损伤的加固钢筋混凝土剪力墙和混凝土包裹钢梁的试验研究

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摘要

A bi-axially loaded shear wall and two fatigue-damaged concrete-encased steel girders are experimentally tested using a retrofit technique that utilizes a newly developed composite wrap. The composite, which is being termed "CarbonFlex," helps to stabilize the propagation of damage, specifically fracture, in retrofitted beams and a shear wall via an energy dissipation mechanism, resulting in significant ductility and confinement, and high-strength sustainability. The CarbonFlex-retrofitted shear wall had been initially damaged to a level corresponding to 40% of its peak strength under bi-axial loading (constant vertical load and quasi-static cyclic lateral load). Following the CarbonFlex-retrofit, the capacity doubled to 80% of its original strength while exhibiting significant ductility and having tremendously improved confinement. The fatigue-damaged beams are retrofitted using conventional carbon-fiber reinforced polymers (CFRPs), and then, separately, using the new prototype CarbonFlex composite. The latter beam sustained over 68% of its peak strength following dissipation of the initial shock energy of the fractured welds of the encased steel girder; the beam also exhibited significant displacement ductility, having an ultimate displacement three times that of its CFRP counterpart.
机译：使用改造技术，利用新开发的复合材料包裹物，对双轴加载的剪力墙和两个疲劳破坏的混凝土包裹钢梁进行了实验测试。该复合材料被称为“ CarbonFlex”，通过能量耗散机制，有助于稳定损伤的传播，特别是通过改型梁和剪力墙在断裂过程中产生的断裂，从而显着延展性和密闭性以及高强度的可持续性。 CarbonFlex改型的剪力墙最初被损坏到相当于其在双轴载荷（恒定的垂直载荷和准静态循环侧向载荷）下其峰值强度的40％的水平。在进行CarbonFlex改装后，其承载能力翻了一番，达到其原始强度的80％，同时具有出色的延展性并极大地改善了密封性能。使用传统的碳纤维增强聚合物（CFRP）对疲劳破坏的梁进行改造，然后分别使用新的原型CarbonFlex复合材料进行改造。在消除了封闭式钢梁断裂焊缝的初始冲击能量之后，后一束梁保持了其峰值强度的68％以上。该梁还表现出显着的位移延展性，其最终位移是其CFRP的三倍。

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