Scholarlink

<p>This study employs advanced structural monitoring techniques to assess the structural soundness of the AL-Rayhanna Bridge, a strategic link between Syria and Iraq, located in western Iraq and dating back 44 years. The collected data acquisition devices and accelerometers, the dynamic responses during heavy traffic are captured. Results show that the natural frequency of the bridge can be increased by 41%, from 3.43 to 4.85 Hz, because of a 50% decrease in elastomeric bearing thickness, due to the degradation in rigidity. The damping ratios of 4.6% are higher than the calculated 1.5%, meaning there is further energy dissipation owing to microcracking problems in the concrete. Based on the result of the Fast Fourier Transform study, the most common vibration frequencies are 2.5 Hz, 5.1 Hz, and 7.8 Hz. In this regard, the heavy vehicles can generate vibrations up to 23 Hz, which may pose potential resonance risks. For dynamic asymmetry, the statistical analysis reveals that the middle girder has the maximum acceleration (0.256&#xa0;m/s<sup>2</sup>) and average acceleration (0.121&#xa0;m/s<sup>2</sup>). To avoid fatigue and maintain the structural integrity of the structure in the long run, it is advisable to replace the bearings immediately and implement targeted interventions such as tuned mass dampers. The current research suggests that the maintenance and monitoring of aged infrastructure regularly is quite essential.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Structural Health Monitoring of 44-Year-Old and Contemporary Bridges: Bearing Degradation and Dynamic Response

  • 期刊论文

  • 发表日期：

    2026年5月12日

查看全文
  • Mohammed O. Hussein,
  • Akram S. Mahmoud

摘要

This study employs advanced structural monitoring techniques to assess the structural soundness of the AL-Rayhanna Bridge, a strategic link between Syria and Iraq, located in western Iraq and dating back 44 years. The collected data acquisition devices and accelerometers, the dynamic responses during heavy traffic are captured. Results show that the natural frequency of the bridge can be increased by 41%, from 3.43 to 4.85 Hz, because of a 50% decrease in elastomeric bearing thickness, due to the degradation in rigidity. The damping ratios of 4.6% are higher than the calculated 1.5%, meaning there is further energy dissipation owing to microcracking problems in the concrete. Based on the result of the Fast Fourier Transform study, the most common vibration frequencies are 2.5 Hz, 5.1 Hz, and 7.8 Hz. In this regard, the heavy vehicles can generate vibrations up to 23 Hz, which may pose potential resonance risks. For dynamic asymmetry, the statistical analysis reveals that the middle girder has the maximum acceleration (0.256 m/s2) and average acceleration (0.121 m/s2). To avoid fatigue and maintain the structural integrity of the structure in the long run, it is advisable to replace the bearings immediately and implement targeted interventions such as tuned mass dampers. The current research suggests that the maintenance and monitoring of aged infrastructure regularly is quite essential.