HR: 0800h
AN: S21B-0210    [Abstracts]
TI: Shake Table Validation of Precariously Balanced Rock Methodology
AU: * Anooshehpoor, R
EM: rasool@seismo.unr.edu
AF: University of Nevada, Reno, Seismological Laboratory174, 1664 N. Virginia street, Reno, NV 89557-0141 United States
AU: Purvance, M D
EM: mdp@seismo.unr.edu
AF: University of Nevada, Reno, Seismological Laboratory174, 1664 N. Virginia street, Reno, NV 89557-0141 United States
AU: Brune, J N
EM: brune@seismo.unr.edu
AF: University of Nevada, Reno, Seismological Laboratory174, 1664 N. Virginia street, Reno, NV 89557-0141 United States
AB: A series of shake table experiments have been carried out at the University of Nevada, Reno Large Scale Laboratory. The bulk of the experiments involved scaling acceleration time histories (uniaxial forcing) from 0.1g to the point where all of the objects on the shake table overturned a specified number of times. In addition, a biaxial experiment was performed for comparative purposes with the uniaxial results. Objects tested ranged in height from ~ 20 cm to about 120 cm and height/width ratios from ~ 10 to ~ 2. The acceleration time histories utilized include strong motion recordings of 1979 Imperil Valley, 1985 Michoacan, 1999 Izmit, 1999 Chi-Chi, 2002 Denali, and 2003 Hokkaido earthquakes and synthetic acceleration time histories (full sine pulse and random vibration records). In order to compare the shake table overturning results with the formulation of Purvance (2005), the numerical overturning results were binned following the shake table experimental format. This process allows one to estimate the equivalent probability of overturning contour corresponding to the shake table experiment. In this case, the first overturning occurrence coincides most often with the 16% probability of overturning contour. The prediction agrees well for rectangular shape object, but tends to overestimate toppling accelerations for the three real rocks used in these experiments.
DE: 7200 SEISMOLOGY
DE: 7212 Earthquake ground motions and engineering seismology
SC: Seismology [S]
MN: Fall Meeting 2005