PSI - Issue 52

Govardhan Polepally et al. / Procedia Structural Integrity 52 (2024) 280–292 Govardhan Polepally/ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 3. Geometric details of different parts of the superstructure (a) Arrangement of cross-bracings; (b) Cross-section of I girder; (c) Cross-section of box girder along with cross-bracings (all dimensions are in mm). 4.3. Instrumentation The AVT setup includes ten tri-axial wireless accelerometer sensors (Fig. 4(a)) and two sets of data acquisition systems (Fig.4 (b)) placed on each span on either side of the girders, as shown in figure 5(d). The sensors are evenly spaced along each girder as shown in figure 5(d). The setup is of range till 1KHz bandwidth of adjustable input range of ± 2/4/8G with low noise on all axis up to 25 µg/ √ Hz or 80 µg/ √ Hz and programmable high and low-pass digital filters. The frequency chosen for each measurement is 128Hz. The data is recorded using Sensor Connect software. While measuring all the accelerometers are synchronized with respect to the same time. For more accurate results all the accelerometers are kept in line with their axes in reference to the bridge plane.

Fig. 4. (a) Accelerometer sensor (Parker Lord G-Link-200-R); (b) Data acquisition (WSDA-2000).

4.4. AVT Past researchers have used different ambient excitation sources to record the vibration data of masonry bridges in the literature (Bayraktar A et al 2015, Costa C et al 2016). In this study, the bridge was excited with a rubber