Location
St. Louis, Missouri
Presentation Date
12 Mar 1991, 2:30 pm - 3:30 pm
Abstract
In a recent compilation and analysis of nearly 750 accelerograms, we studied six pairs of triaxial accelerograms recorded digitally at two neighboring sites underlain by rock and soil, respectively. The distance between the two sites, both located south of the SMART1 array in northeast Taiwan, is approximately 2 km. The epicentral distances are less than 80 km. For each component, we computed the ratios of peak and spectral amplitudes recorded at the soil site to that of the rock site, for three peak parameters and 23 spectral ordinates. The mean estimates of the soil amplification for the peak parameters range between 1 and 3. The spectral variation of soil amplification factor is similar for the two horizontal components. They are relatively flat in the high frequency range, peak in mid-frequency range, and decrease at longer periods. The N-S component has a ratio of about 1.35 at high frequencies, increasing to about 3 between 1 and 2 seconds, then decreasing to around 2.4 at longer periods. The E-W component shows higher ratios, stating at about 2 at high frequencies, increasing as high as 7 near two sec Period, and falling off to about 2 at longer periods. For the vertical component the soil-to-rock amplitude-ratio is nearly 1.5 in the high frequency range above 2Hz. This ratio increases to nearly 3 in mid-frequency range, and falls off to about unity for longer periods. While the horizontal ratios peak at about 2 sec, the maximum vertical spectral ratio occurs near 0.8 sec.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
2nd International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1991 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Niazi, Mansour, "Evaluation of Soil Amplification at Smart1 Array, Taiwan" (1991). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 13.
https://scholarsmine.mst.edu/icrageesd/02icrageesd/session08/13
Included in
Evaluation of Soil Amplification at Smart1 Array, Taiwan
St. Louis, Missouri
In a recent compilation and analysis of nearly 750 accelerograms, we studied six pairs of triaxial accelerograms recorded digitally at two neighboring sites underlain by rock and soil, respectively. The distance between the two sites, both located south of the SMART1 array in northeast Taiwan, is approximately 2 km. The epicentral distances are less than 80 km. For each component, we computed the ratios of peak and spectral amplitudes recorded at the soil site to that of the rock site, for three peak parameters and 23 spectral ordinates. The mean estimates of the soil amplification for the peak parameters range between 1 and 3. The spectral variation of soil amplification factor is similar for the two horizontal components. They are relatively flat in the high frequency range, peak in mid-frequency range, and decrease at longer periods. The N-S component has a ratio of about 1.35 at high frequencies, increasing to about 3 between 1 and 2 seconds, then decreasing to around 2.4 at longer periods. The E-W component shows higher ratios, stating at about 2 at high frequencies, increasing as high as 7 near two sec Period, and falling off to about 2 at longer periods. For the vertical component the soil-to-rock amplitude-ratio is nearly 1.5 in the high frequency range above 2Hz. This ratio increases to nearly 3 in mid-frequency range, and falls off to about unity for longer periods. While the horizontal ratios peak at about 2 sec, the maximum vertical spectral ratio occurs near 0.8 sec.
