Location
San Diego, California
Presentation Date
30 Mar 2001, 1:30 pm - 3:30 pm
Abstract
This paper provides a method for estimating the non-stationary variations of rigidity and damping of soils related intimately to the non-linear earthquake responses of ground. This method uses the concept of the “Complex Envelope” to inversely estimate soil rigidity and damping from the time histories of stress and strain induced in soils. It is quite different from the conventional method, which uses graphical technique for the stress-strain orbit, in the point of quantitatively estimating the time-dependent variations of soil rigidity and damping. The validity of the method is first discussed using theoretical derivations and numerical simulations. It is then applied to the down-hole array records of strong motions obtained at Port Island during the 1995 Kobe Earthquake, Japan. The analyzed results showed that some extreme reductions of soil rigidity occurred in the superficial layers during the mainshock of the earthquake, depending strongly on strain behaviors.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 2001 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
Kamiyama, Makoto and Yoshida, Masaru, "A Method for Estimating Non-Stationary Variation of Soil Rigidity During Strong Motions" (2001). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 9.
https://scholarsmine.mst.edu/icrageesd/04icrageesd/session03/9
Included in
A Method for Estimating Non-Stationary Variation of Soil Rigidity During Strong Motions
San Diego, California
This paper provides a method for estimating the non-stationary variations of rigidity and damping of soils related intimately to the non-linear earthquake responses of ground. This method uses the concept of the “Complex Envelope” to inversely estimate soil rigidity and damping from the time histories of stress and strain induced in soils. It is quite different from the conventional method, which uses graphical technique for the stress-strain orbit, in the point of quantitatively estimating the time-dependent variations of soil rigidity and damping. The validity of the method is first discussed using theoretical derivations and numerical simulations. It is then applied to the down-hole array records of strong motions obtained at Port Island during the 1995 Kobe Earthquake, Japan. The analyzed results showed that some extreme reductions of soil rigidity occurred in the superficial layers during the mainshock of the earthquake, depending strongly on strain behaviors.
