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Near-surface frequency-dependent nonlinear damping ratio observation of ground motions using SMART1
- Source :
- Soil Dynamics and Earthquake Engineering. 147:106798
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- The damping ratio is an important index used in soil nonlinearity studies and is mostly proportional to the shear strain increase. Previous researches indicated a frequency-independent damping in most cases. In this study, frequency-dependent damping was introduced from frequency-dependent Q calculated through the spectral ratio method of near-surface structures using the power spectrum of strong motion records in the Strong Motion Array in Taiwan Phase I (SMART1). The dense SMART1 recorded significant strong motions in the 1980s, which can be used to identify soil nonlinearity at near surfaces. A 40%–50% increase in frequency-dependent damping for SMART1 was identified, with strain increasing from 0.01% to 0.1% in near-surface regions. A large damping was also found in the shallow sediments with mean Vs below 600 m/s on the topmost 500 m layers in the SMART1 database at a frequency range of 3–8 Hz, which is independent of the magnitude scaling or near-field travel distance scaling relations.
- Subjects :
- Physics
Damping ratio
0211 other engineering and technologies
Phase (waves)
Soil Science
Spectral density
Magnitude (mathematics)
020101 civil engineering
02 engineering and technology
Geotechnical Engineering and Engineering Geology
0201 civil engineering
Computational physics
Nonlinear system
Range (statistics)
Shear stress
Scaling
021101 geological & geomatics engineering
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 02677261
- Volume :
- 147
- Database :
- OpenAIRE
- Journal :
- Soil Dynamics and Earthquake Engineering
- Accession number :
- edsair.doi...........50c5da741e118422c3de21a768bf848f