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An Improved Step-Type Liquid Level Sensing System for Bridge Structural Dynamic Deflection Monitoring.

Xijun Ye1, Zhuo Sun2, Xu Cai3

  • 1School of Civil Engineering, Guangzhou University, Guangzhou 510006, China. xijun_ye@gzhu.edu.cn.

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|May 12, 2019
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An improved step-type liquid level sensing system (LLSS) enhances bridge health monitoring by reducing inclination angle interference. Optimal placement ensures measurement accuracy below 6% by considering turbulent flow effects.

Keywords:
dynamic deflectionliquid level sensing systemstep-typestructural health monitoring

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Area of Science:

  • Structural Engineering
  • Civil Engineering
  • Sensor Technology

Background:

  • Accurate dynamic deflection monitoring is crucial for bridge health and condition assessment.
  • Traditional methods can be affected by inclination angles, impacting measurement precision.

Purpose of the Study:

  • To introduce an improved step-type liquid level sensing system (LLSS) for precise dynamic deflection monitoring.
  • To analyze and mitigate factors affecting measurement accuracy in structural health monitoring.

Main Methods:

  • Replacing straight-line pipelines with step-type pipelines to eliminate inclination angle interference.
  • Utilizing fluid dynamics analysis and ANSYS-FLOTRAN to study turbulent flow effects.
  • Experimentally evaluating key parameters: initial displacement, step height, and measurement point distance from the elbow.

Main Results:

  • Measurement accuracy is primarily influenced by turbulent flow generated by the step height.
  • A distance of approximately 1.0 m from the elbow significantly reduces measurement error.
  • To maintain <6% error, the measurement point must be placed >1.0 m from the elbow.

Conclusions:

  • The step-type LLSS offers a viable solution for accurate dynamic deflection monitoring in bridges.
  • Understanding and controlling turbulent flow is key to optimizing LLSS performance.
  • Strategic placement of measurement points is essential for reliable structural health assessment.