PSI - Issue 44

Alberto Castellani et al. / Procedia Structural Integrity 44 (2023) 19–26 A.Castellani / Structural Integrity Procedia 00 (2022) 000–000

22

Fig. 3 Smart1 in Taiwan: distribution of the 29 instruments identification.

Table 1: values of PRV/PGA collected by different instruments of the Taiwan Array, during two different earthquakes, (shown under brackets). Mean value 1.311. Rms = 1.23. PGA for the five registrations of event 33, mean value = 0.699 ms 2 . Rms = 0.657 ms 2 . The symbol Rms stays for root mean square).

Table 2. Peak vertical acceleration at the stations, during the entire time history. Average value 460.45 mm/s 2 . station absolute peak (mm/s 2 ) C00 415.98 I06 313.25 I12 589.18 M07 494.84 M01 831.70 O07 277.04 O01 292.20

In an area of 12 km 2 the root mean square of the PRV/PGA is nearby as high as the mean value of the peak. DAIs derived rotations, and direct measurements at single points, are in principle a parent experimental measure, being the punctual rotation equal to the derivative, with respect to space, of the translations. The DAIs derived rotations are sensitive to “noise”, that is likely to be present in point rotation instruments as well. Meanwhile, the practical