Location
San Diego, California
Presentation Date
27 May 2010, 7:30 pm - 9:00 pm
Abstract
Earthquake waves propagate mainly in rock mass from hypocenter to the bedrock directly underneath a monitoring station. Then, it propagates as shear waves from the bedrock to a geophone, where the surface motion is measured. For a deposit with uniform soil layers of horizontal interfaces, one-dimensional finite element analysis can be performed to analyze the dynamic responses of a horizontal soil deposit. In an ideal dynamic soil-structure interaction analysis, seismic waves are propagated from the bedrock through soils and foundations, and then to structure. Thus, it is necessary to obtain the bedrock motion from a measured surface motion registered in geophone. Conventionally the process is called de-convolution. The de-convolution is treated as wave propagation in a frequency domain involving damping factor independent of motion velocity. The time-domain analysis is usually used in assessing the effects of soil-structure interaction. The time domain analysis requires the use of viscous damping proportional to motion velocity. Thus, it is necessary to device a method for the evaluation of viscous damping that, when used in the time domain analysis for the upward wave propagation from the bedrock back to ground surface, produces a surface motion in close agreement to the measured surface motion. This paper presents a procedure for evaluation of viscous damping from a given damping factors. This viscous damping successfully produces a surface motion in close agreement with the measured surface motion in a time domain analysis of upward wave propagation.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 Missouri University of Science and Technology, 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
Chang, Nien-Yin and Nghiem, Hien Manh, "Viscous Damping for Time Domain Finite Element Analysis" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 16.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session02/16
Included in
Viscous Damping for Time Domain Finite Element Analysis
San Diego, California
Earthquake waves propagate mainly in rock mass from hypocenter to the bedrock directly underneath a monitoring station. Then, it propagates as shear waves from the bedrock to a geophone, where the surface motion is measured. For a deposit with uniform soil layers of horizontal interfaces, one-dimensional finite element analysis can be performed to analyze the dynamic responses of a horizontal soil deposit. In an ideal dynamic soil-structure interaction analysis, seismic waves are propagated from the bedrock through soils and foundations, and then to structure. Thus, it is necessary to obtain the bedrock motion from a measured surface motion registered in geophone. Conventionally the process is called de-convolution. The de-convolution is treated as wave propagation in a frequency domain involving damping factor independent of motion velocity. The time-domain analysis is usually used in assessing the effects of soil-structure interaction. The time domain analysis requires the use of viscous damping proportional to motion velocity. Thus, it is necessary to device a method for the evaluation of viscous damping that, when used in the time domain analysis for the upward wave propagation from the bedrock back to ground surface, produces a surface motion in close agreement to the measured surface motion. This paper presents a procedure for evaluation of viscous damping from a given damping factors. This viscous damping successfully produces a surface motion in close agreement with the measured surface motion in a time domain analysis of upward wave propagation.
