Study on Bridge Deformation Monitoring Based on FL Ground-based Radar Interferometry Technology
Ground-based radar interferometry technology can monitor the overall operation status of extra-large linear buildings(structures)in a non-contact state,and the measurement accuracy can reach sub-millimeter level,which can be used as an important means of bridge health monitoring.Therefore,in this paper,the FL mode of this technology is used to monitor extra-large span bridges,obtain 24-hour bridge de-formation evolution data,and study the influence of external factors on bridge deformation law.The results show that the deformation of the bridge in the natural environment is negatively correlated with temperature and air pressure,and positively correlated with wind speed,and the data show that the maximum deformation of 11.44 mm occurs when the temperature changes about1℃.In addition,the data on the day of the experiment showed that the maximum deformation in the natural state occurred in the edge span,not in the middle of the span.This phenome-non is the result of the interaction of theoretical design and complex environment.The measured data shows that the ground-based radar inter-ferometry system can quickly detect the bending mode of bridge structure,which is especially suitable for emergency monitoring of long-span bridge system after disaster.
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