Page 137 - Çevre Şehir İklim İngilizce - Sayı 4

Cenk Alhan - Mert Hacıemiroğlu

Table 3. Characteristics of the Imperial Valley-06 Earthquake, El Centro Array #6
Record

Figure 10. Comparison of the RSN181 resultant horizontal acceleration spectrum with 1.3
times the DD1 earthquake ground motion spectrum (with 5% damping)
Near-fault features usually occur if the distance to the fault is less than 10
km, and the effects increase exponentially as this distance decreases. While
the peak ground velocity of a typical earthquake is 25 cm/s ~ 50 cm/s, for
the RSN181 record, where the closest distance to the fault is 1.35 km, as
can be seen from the table, the horizontal component E06230 peak ground
velocity is a very high value, such as 113.55 cm/s. The velocity-time recording
of this component and the velocity pulse characteristics determined in the
Seismosignal (2023) program are given in Figure 11. The period of the velocity
pulse is 3.96 s and coincides almost consecutively with the isolation period of
4.17 s obtained by the isolator lower limit properties. The result of this situation
is that the insulator displacement demands increased a lot (Figure 12), and
the peak isolator displacement demands in the X and Y direction were 28.0
cm and 83.2 cm, respectively, and the peak resultant insulator displacement
demand was 93.2 cm.

126 The Journal of Environment, Urban and Climate