Continuous ambient vibration measurements: experimental setup and first results on an arch dam


Figure 2. View from the top of the dam with location of the sensors


2.2. Ambient vibration measurement setup The experimental setup consists of 5 three-dimensional velocimeters (blue circles in Figure 2). The sensors are IGU-16HR 3C 5Hz from SmartSolo. Four devices are placed near the crest of the arch inside pendulum rooms as presented in Figure 2 and Figure 3. The last device is located on the rock at the right abutment to provide a reference measurement. These devices are independent of each other, and the GPS- synchronized timestamp allows them to be considered as a network of synchronized measurements. The measurement is performed continuously with a sample rate of 4 ms. The raw measurements are velocities continuously recorded by three directional velocimeters. They are positioned to measure along the upstream-downstream direction of the dam, the tangential axis, and the vertical axis.


Figure 3. Velocimeter in a pendulum room with electric power supply Vol XXXIII Issue 3 | Dam Engineering | 143


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