ANALYSIS OF TEMPERATURE AT MEASUREMENTS OF DISPLACEMENTS ON STRUCTURES
Measurement of displacement and deformation of structures is a very demanding engineering task and is carried out on all existing and newly built bridges and other demanding structures. They can be carried out with the most diverse, state of the art instruments, which are highly sensitive to atmospheric parameters. The results of the measured displacements are thus influenced by several atmospheric parameters, among which the temperature is exposed, since the measurements are usually carried out over the whole day at different seasons and conditions, where the temperature differences are significant. In this paper the influence of temperature on the geodetic measurements of the displacements of the steel structure in the unburdened state is presented. To this end, measurements of the steel bridge during the summer time was performed. The temperature and thermal imaging at various locations every half hour were investigated. Geodetic measurements with a 0.5 " instrument on four geodetic targets were performed. To calculate the influence of the temperature on the position of the observed point some statistical methods were used. It is evident from the results that in this kind of geodetic measurements, temperature measurements are indispensable. It should be measured the air temperature, but also the temperature of the structure, prism glasses and lenses on the instrument. By taking into account the temperature correction results that are very comparable with the predicted values of displacements we can be obtain. Not observing the temperature can lead to misleading values of displacement which can lead to misinterpretation and consideration of the obtained value.
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