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A Method for Settlement Detection of the Transmission Line Tower under Wind Force
Xinbo Huang1, Yu Zhao2, Long Zhao3
1School of Electronics and Information, Xi'an Polytechnic University, Xi'an 710048, China. huangxinbo@xpu.edu.cn.
Sensors (Basel, Switzerland)
|December 15, 2018
Summary
Transmission tower foundation settlement can be detected by monitoring its vibration characteristics. Changes in modal frequencies under wind load, especially in the X-direction, correlate with settlement displacement, offering a method for foundation integrity assessment.
Area of Science:
- Structural Engineering
- Geotechnical Engineering
- Vibration Analysis
Background:
- Transmission towers are critical infrastructure susceptible to foundation settlement.
- Foundation settlement can compromise structural integrity and operational safety.
- Monitoring tower vibrations offers a non-invasive method to assess foundation conditions.
Purpose of the Study:
- To investigate the impact of foundation settlement on the vibration characteristics of a 110 kV transmission tower.
- To establish a correlation between settlement displacement and changes in modal frequencies.
- To propose vibration analysis as an effective method for detecting transmission tower foundation settlement.
Main Methods:
- Experimental measurement of vibration response and environmental parameters using acceleration and meteorological sensors.
- Simulation of tower foundation settlement using a dedicated experimental platform.
- Extraction of low-order modal frequencies via stochastic subspace identification (SSI).
- Temperature correction applied to modal frequencies for accurate analysis.
Main Results:
- Significant changes in X-direction modal frequencies were observed before and after foundation settlement.
- The rate of change in modal frequencies increased proportionally with settlement displacement.
- Temperature-corrected modal frequencies provided reliable data for analysis.
Conclusions:
- Foundation settlement demonstrably alters the vibration characteristics of transmission towers.
- The observed changes in modal frequencies serve as effective indicators for detecting foundation settlement.
- Vibration monitoring presents a viable technique for assessing the health of transmission tower foundations.
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