| Abstract: | Foundation impedance functions provide a simple means to account for soil-structure interaction (SSI) when studying seismic response of structures. Impedance functions represent the dynamic stiffness of the soil media surrounding the foundation. The fact that impedance functions are frequency dependent makes it difficult to incorporate SSI in standard time-history analysis software. This paper introduces a simple method to convert frequency-dependent impedance functions into time-domain filters. The method is based on the least-squares approximation of impedance functions by ratios of two complex polynomials. Such ratios are equivalent, in the time-domain, to discrete-time recursive filters, which are simple finite-difference equations giving the relationship between foundation forces and displacements. These filters can easily be incorporated into standard time-history analysis programs. Three examples are presented to show the applications of the method. |
| Genre: | Article |
| ProdID: | 70030926 |
| Citation Author: | Safak, E. |
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| Citation End Page: | 70 |
| Citation Issue: | 1 |
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| Citation Language: | English |
| Citation Larger Work Title: | Soil Dynamics and Earthquake Engineering |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | Time-domain representation of frequency-dependent foundation impedance functions; 2006; Article; Journal; Soil Dynamics and Earthquake Engineering; Safak, E. |
| Citation Start Page: | 65 |
| Citation Volume: | 26 |
| Citation Year: | 2006 |
| Type: | citation/reference |
| Text: | Time-domain representation of frequency-dependent foundation impedance functions; 2006; Article; Journal; Soil Dynamics and Earthquake Engineering; Safak, E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.soildyn.2005.08.004 |
| Date Other: | Sun, 1 Jan 2006 00:00 -0600 |
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