Foundation uplift is the partial separation of a shallow foundation from soil due
to excessive load eccentricity. Foundation uplift can significantly change the
seismic response of slender structures, and frames as well. In literature, different
support models for foundations are employed in order to simulate foundation
uplift in seismic analysis of structures. One of the most widely used models is the
Winkler model which assumes distributed tensionless springs beneath a shallow
foundation. In this study, two simple algorithms are developed in order to
compute static and dynamic response of foundations on tensionless supports. Any
formula given in literature for calculation of foundation impedance coefficients
can be easily introduced in these algorithms. Hence, the use of Winkler model is
critically evaluated through comparisons with the response of a foundation on
elastic halfspace. For that purpose, available impedance formulas given for a
shallow rectangular foundation on elastic halfspace are used. It is concluded that,
the coupling between vertical displacement and rocking of foundation is very
significant during uplift. Therefore, the accuracy of Winkler model in uplift
v
simulation is limited, since the model cannot simulate vertical and rocking
response of a shallow foundation concurrently with a single spring coefficient.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12609784/index.pdf |
| Date | 01 August 2008 |
| Creators | Taymus, Refik Burak |
| Contributors | Yilmaz, Mustafa Tolga |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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