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Structural Condition Assessment of the Herringbone Middle Pylon of the Taizhou Bridge Using SHM Strain Data

机译：使用SHM应变数据的台州桥人字形中间塔的结构条件评估

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摘要

Taizhou Bridge is the world's first kilometer-scale three-pylon suspension bridge. To minimize the impacts on navigation, a longitudinal herringbone steel pylon was adopted in the middle of the bridge without additional piers. This structure is unique, and little research has focused on its structural condition assessment. In this paper, eighty fiber Bragg grating strain sensors were deployed along the height of the steel tower to collect strain data about the key components and to monitor the pylon's structural condition. Because temperature-induced strain contributes little to the stress in the pylon, the empirical mode decomposition method was proposed to remove the noise and the temperature-induced strain, leaving the dynamic strain response. The frequency characteristics were obtained from both the dynamic strain and the raw strain, and they show good agreement. A statistical analysis was adopted assuming that the extracted dynamic stress peaks and valleys were normally distributed. The expected maximum values from the statistical analysis were compared with the measured maximum values at different heights, and they agree well with each other. The maximum compression and tension of the key segments of the middle tower exhibited considerable redundancy, which indicates that the middle pylon is in good condition.
机译：台州桥是世界上第一公里规模的三塔悬架桥。为了最大限度地减少导航的影响，在桥中间采用纵向人字形钢塔而无需额外的码头。这种结构是独一无二的，很少的研究专注于其结构条件评估。本文沿钢塔的高度部署了八十纤维布拉格光栅应变传感器，以收集关键部件的应变数据，并监测幽门的结构状况。由于温度诱导的应变对塔架中的应力有很大贡献，所以提出了经验模式分解方法以去除噪声和温度诱导的应变，留下动态应变响应。频率特性是从动态应变和原始菌株获得的，并且它们表现出良好的一致性。采用统计分析假设通常分布提取的动态应力峰和谷。将统计分析的预期最大值与不同高度的测量的最大值进行比较，并且它们彼此吻合得很好。中间塔的关键段的最大压缩和张力表现出相当大的冗余，表明中间塔的状况良好。

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  • 来源
    《Journal of Sensors》 |2017年第4期|共10页
  • 作者

    Ding Huaping; Shen Qinghong; Du Sidan;

  • 作者单位

    Nanjing Univ Sch Elect Sci &

    Engn Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Univ Sch Elect Sci &

    Engn Nanjing 210023 Jiangsu Peoples R China;

    Nanjing Univ Sch Elect Sci &

    Engn Nanjing 210023 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 TP212;
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