Abstract
Radar interferometry measurements were used to determine the dynamic response of two bridges. The dynamic excitation was performed via trucks crossing the road bumps placed upon each structure. From the relevant records we then determined the spectral values of the bridges. Detailed mathematical models enabled us to compute the natural frequencies and modes (shapes), and these were subsequently compared with their measured counterparts.
Highlights
In the monitoring of bridge structures, a basic observed quantity consists in the displacement of structural points caused by the response to the self-weight, traffic, and wind
The static and dynamic behaviour can be examined via a novel contactless method exploiting radar interferometry; in the wider sense, this approach is still being tested
A series of previous experimental measurements showed that the discussed technique can be applied in fast contactless defining of vertical deflections, with the accuracy of up to 0.01 mm in real time
Summary
In the monitoring of bridge structures, a basic observed quantity consists in the displacement of structural points caused by the response to the self-weight, traffic, and wind. Before using the method to monitor the static and dynamic motion of a structure, it is advisable to recognize the basic static values (deflections of the structure) specified within relevant calculations and the main natural frequencies and vibration modes, or shapes Such a set of data enables us to identify suitable positions for the radar reflectors, and it facilitates the verification of or comparison between the measured values. To demonstrate the applicability of interferometry in measuring the responses of various bridges, we present the outcomes of measurement cycles performed in two markedly different bridges Both the identification of suitable positions to place the radar reflectors and the selected force excitation procedure (via trucks) exploited design computations simulating the actual load test. We compared the measured and computed deflection values produced by the static testing; the records of the dynamic responses obtained during the excitation of the bridges through the vehicles enabled us to determine the natural vibration frequencies to be correlated with the computed values
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