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Experimental study of seismic behavior of partially corrosion-damaged reinforced concrete columns strengthened with FRP composites with large deformability

机译：FRP大变形复合材料加固部分锈蚀钢筋混凝土柱抗震性能的试验研究。

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摘要

Fiber reinforced polymer (FRP) jackets with a large rupture strain are formed by embedding polyethylene terephthalate (PET) or polyethylene naphthalate(PEN) fibers in the epoxy resin binder. PEN and PET fibers are made of recycled materials (e.g., PET bottles), possessing the advantages of large rupture strain, low elastic modulus, environmental protection and economy. To simulate the actual non-uniform corrosion of steel bars in the columns, the corrosion rate of steel bars in the plastic hinge region was designed as 15% by using electrochemical corrosion method. Partially corroded reinforced concrete columns with different reinforcement ratios were strengthened with carbon FRP (CFRP) and PET-600 composites respectively. All the columns were subjected to the quasi-static tests. The seismic performance of hysteretic hoops, failure modes, residual displacement, stiffness degradation, damping ratio and energy dissipation were analyzed. The experimental results showed that PET-600 and CFPP strengthened columns had the basically same anti-seismic performance, indicating that PET-600 could be worked as a new type of high performance strengthening materials in the structure strengthening field. (C) 2018 Elsevier Ltd. All rights reserved.
机译：通过将聚对苯二甲酸乙二醇酯（PET）或聚萘二甲酸乙二醇酯（PEN）纤维嵌入环氧树脂粘合剂中，可以形成具有大断裂应变的纤维增强聚合物（FRP）护套。 PEN和PET纤维由可回收材料制成（例如PET瓶），具有破裂应变大，弹性模量低，环保和经济的优点。为了模拟柱中钢筋的实际非均匀腐蚀，采用电化学腐蚀方法将塑料铰链区域中的钢筋腐蚀率设计为15％。采用碳纤维增强塑料（CFRP）和PET-600复合材料分别加固了具有不同配筋率的部分腐蚀钢筋混凝土柱。所有的柱子都经过准静态测试。分析了磁滞环的抗震性能，破坏模式，残余位移，刚度退化，阻尼比和能量耗散。实验结果表明，PET-600和CFPP增强柱具有基本相同的抗震性能，表明PET-600可作为结构增强领域中的新型高性能增强材料。 （C）2018 Elsevier Ltd.保留所有权利。

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