Geoscience Reference
In-Depth Information
It can be seen that the peak ground acceleration reaches 0.27 g and peak
ground velocity reaches approximately 0.5 m/s. The input acceleration motion
was applied at the base of the model. Free-field boundary conditions were
assumed at the sides of the model using the free-field boundary feature built in
FLAC. This enabled truncation of the sides of the model close to the wall faces
while still maintaining the condition of vertically propagating shear waves.
For the dynamic analysis, several key parameters were monitored
throughout the duration of ground shaking. Of primary interest were the
displacements along both faces of the wall and the wall centerline, and the
maximum forces along the length of the reinforcements. The deformed shape
of the grid at the end of shaking is shown in Fig. 8 .
It can be seen that the wall settled along the centerline and bulged laterally
near the base. A predicted maximum permanent lateral deformation of 16 cm
occurred about one third of the wall height above the base. This prediction agrees
well with the actual measured peak lateral displacement of 10 cm that occurred
near the bottom of the wall. Displacements for both faces of the wall were
monitored versus time during the analysis at many locations; see Fig. 9 .
Figure 7 Acceleration and velocity time history used in the analyses—Kocaeli
earthquake YPT Station EW component (record above is bandpass filtered and baseline
corrected).
 
Search WWH ::




Custom Search