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Seismic performance of precast segmental bridge columns repaired with CFRP wraps

机译：CFRP包装修复预制节段桥柱的地震性能

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摘要

Precast segmental bridge columns (PSBCs) have many advantages compared with monolithic bridge columns. However, PSBCs could be severely damaged during an earthquake due to their limited seismic capacity. Rapid repair of the PSBCs and the seismic behavior of the repaired PSBCs are critical to the post-earthquake recovery of bridges with such columns. In this study, an original PSBC specimen is designed, constructed, and tested under cyclic loading. After the cyclic test on the original specimen is carried out, carbon fiber reinforced polymer (CFRP) sheets and sticky steel glue are used to repair the damaged specimen. The repaired PSBC specimen is then tested under the same loading protocol as the original specimen to compare their cyclic performance. Test results show that the concrete damage of the repaired specimen is reduced compared to the original specimen, and the repaired column has a relatively larger energy dissipation and residual displacement than those of the original column. To leverage the test results, detailed three-dimensional finite element models are developed and calibrated with the results from the experiments. Closely replicating the test results, the validated finite element models are used to replace the lab experiments for the parametric modeling of the seismic performance of bridges with PSBCs while capturing effects of CFRP. Specifically, the influence of CFRP design variables, including the CFRP cross-sectional area ratio and the CFRP height ratio, on the seismic performance of the repaired PSBCs is evaluated by using the validated finite element model. It is found that the CFRP cross-sectional area ratio has little effect on the seismic capacity of the repaired PSBCs, and the repaired PSBC with a CFRP height ratio of 2.0 is the most suitable for the repaired PSBCs investigated in this study.
机译：预制分段桥柱（PSBCS）与单片桥柱相比具有许多优点。然而，由于其抗震能力有限，在地震期间可能会受到严重损坏PSBC。 PSBC的快速修复和修复的PSBC的地震行为对于用这种柱子的桥接后恢复至关重要。在本研究中，在循环载荷下设计，构造和测试原始的PSBC样本。在进行原始样品上的循环试验后，使用碳纤维增强聚合物（CFRP）板和粘性钢胶用于修复受损的样品。然后在与原始标本相同的加载协议下测试修复的PSBC样本以比较它们的循环性能。测试结果表明，与原始试样相比，修复试样的混凝土损伤，并且修复的塔比原始柱的蓄能量相对较大的能量耗散和残留位移。为了利用测试结果，通过实验的结果开发并校准详细的三维有限元模型。密切复制测试结果，验证的有限元模型用于替换用于参数建模的实验室实验，用于使用PSBC的桥梁的地震性能，同时捕获CFRP的效果。具体地，通过使用验证的有限元模型评估CFRP设计变量，包括CFRP横截面积比和CFRP高度比的CFRP横截面积比和CFRP高度比。结果发现，CFRP横截面积比对修复的PSBC的地震能力几乎没有影响，并且具有CFRP高度比为2.0的修复的PSBC是最适合于本研究中研究的修复的PSBC。

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  • 来源
    《Composite Structures》 |2020年第7期|112218.1-112218.11|共11页
  • 作者

    Zhang Yuye; Tabandeh Armin; Ma Yu; Gardoni Paolo;

  • 作者单位

    Nanjing Univ Sci & Technol Dept Civil Engn 200 Xiaolingwei St Nanjing 210094 Peoples R China|Univ Illinois Dept Civil & Environm Engn Urbana IL 61801 USA;

    Univ Illinois Dept Civil & Environm Engn Urbana IL 61801 USA;

    Nanjing Univ Sci & Technol Dept Civil Engn 200 Xiaolingwei St Nanjing 210094 Peoples R China;

    Univ Illinois Dept Civil & Environm Engn Urbana IL 61801 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CFRP wraps; Quasi-static tests; Precast segmental columns; Resilience; Seismic repair;

    机译：CFRP包装;准静态测试;预制节段列;弹性;地震修复;

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