This technology is a bridge structural performance measurement method that collects data from GPS receivers installed on the tops of multiple bridge towers, extracts only the dynamic frequency band using a filter to determine dynamic displacement, and then calculates the damping ratio and fundamental frequency through RD signature and IRF correction.
Bridge performance manifests as fixed, semi-fixed, and dynamic movements depending on wind speed, temperature changes, and traffic volume. Among these, it has been difficult to accurately isolate and measure the dynamic components that significantly influence structural performance. While precise management of tower behavior is required even during normal operations, there has been a lack of simple and accurate methods to achieve this.
This technology divides dynamic displacement into multiple time windows to obtain RD signatures for each segment relative to a reference segment. It then removes outliers caused by noise, sensor malfunctions, or environmental fluctuations from the IRF values using Mahalanobis distance analysis, and calculates dynamic characteristics using one of the LSCE, HEM, or ERA algorithms. The distance between towers ranges from 100 to 1,000 meters, and results are verified by comparing them with displacement data obtained from an accelerometer on one of the towers. Applicable to continuous monitoring of cable-stayed and suspension bridge pylons, structural health monitoring of long-span bridges, and safety inspections following earthquakes or high winds, it allows for accurate tracking of changes in bridge vibration characteristics using only GPS data, without the need for extensive additional instrumentation.
This invention was developed with support from the Ministry of Land, Infrastructure and Transport for the commercialization of PC retaining walls with integrated foundations using the Pre-Stress method.
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