Motion detection at Munich's Olympic tower with a multi-sensor system operating at different samping rates
Schafer, Thomas ... [et al.]
This paper introduces a multi-sensor system which was implemented to test the achievement potential of several sensors in order to observe absolute deformations as well as highfrequency motions of buildings. For the model experiment Munichhs Olympic Tower with a height of 291 m was chosen as test object. Depending on wind conditions and insolation the magnitude of the motion can thereby achieve several decimetres. During the changeover to DVB-T (Digital Video Broadcast - Terrestrial) it was possible to implement a multi-sensor system consisting of a Leica GPS1200 receiver which was placed on the very top of the tower and two total stations (Leica TCRA 1101+) tracking a 3600 prism mounted below the GPS antenna. In addition a biaxial inclination sensor (Nivel20) and an Inertial Measurement Unit (IMU) by iMAR were placed at a level of 203 m. All in all the sensors collected data during a period of 36 days including two storms with a maximum wind speeds over 30 meters per second. Running at different sampling rates (TPS at 2.5 Hz, Nivel20 at 5 Hz, GPS at 20 Hz and IMU at 100 Hz) the data is used to derive the absolute movement over the course of the days as well as to determine the natural frequencies of the building.
Event: XXIII International FIG Congress : Shaping the change
Only personal, non-commercial use of this document is allowed.