| Abstract: | For proper understanding of soil behavior during earthquakes and assessment of a realistic surface motion, studies of the large-strain dynamic response of non-linear hysteretic soil systems are indispensable. Most of the presently available studies are based on the assumption that the response of a soil deposit is mainly due to the upward propagation of horizontally polarized shear waves from the underlying bedrock. Equivalent-linear procedures, currently in common use in non-linear soil response analysis, provide a simple approach and have been favorably compared with the actual recorded motions in some particular cases. Strain compatibility in these equivalent-linear approaches is maintained by selecting values of shear moduli and damping ratios in accordance with the average soil strains, in an iterative manner. Truly non-linear constitutive models with complete strain compatibility have also been employed. The equivalent-linear approaches often raise some doubt as to the reliability of their results concerning the system response in high frequency regions. In these frequency regions the equivalent-linear methods may underestimate the surface motion by as much as a factor of two or more. Although studies are complete in their methods of analysis, they inevitably provide applications pertaining only to a few specific soil systems, and do not lead to general conclusions about soil behavior. This report attempts to provide a general picture of the soil response through the use of a single-degree-of-freedom non-linear-hysteretic model. Although the investigation is based on a specific type of nonlinearity and a set of dynamic soil properties, the method described does not limit itself to these assumptions and is equally applicable to other types of nonlinearity and soil parameters. |
| Genre: | USGS Numbered Series |
| ProdID: | 8750 |
| Citation Author: | Erdik, Mustafa Ozder |
| Citation Contributing Office: | Earthquake Science Center, Menlo Park Science Center |
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| Citation Language: | English |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | i, 35 p.; Tables; Figures |
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| Citation Public Comments: | In cooperation with the Institute of the Middle East Technical University, Ankara, Turkey |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 79-592 |
| Citation Search Results Text: | A single-degree-of-freedom model for non-linear soil amplification; 1979; OFR; 79-592; Erdik, Mustafa Ozder |
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| Citation Year: | 1979 |
| Type: | citation/reference |
| Text: | A single-degree-of-freedom model for non-linear soil amplification; 1979; OFR; 79-592; Erdik, Mustafa Ozder |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/ofr_79_592.gif |
| URL (INDEX PAGE): | http://pubs.usgs.gov/of/1979/0592/ |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
