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SETTLEMENT OF DRY COHESIONLESS
SOIL DEPOSITS
UNDER EARTHQUAKE INDUCED LOADING
by
Jamal I Ramadan
_____________________________________________________________
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(CIVIL ENGINEERING)
December 2007
Copyright 2007 Jamal Ibrahim Ramadan
Object Description
| Title | Settlement of dry cohesionless soil deposits under earthquake induced loading |
| Author | Ramadan, Jamal Ibzahim |
| Author email | ramadan@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Civil Engineering (Geotechnical Engineering) |
| School | Viterbi School of Engineering |
| Date defended/completed | 2007-05-29 |
| Date submitted | 2007 |
| Restricted until | Unrestricted |
| Date published | 2007-12-14 |
| Advisor (committee chair) | Martin, Geoffrey R. |
| Advisor (committee member) |
Trifunac, M. D. Wellford, L. Carter Wong, Hung Leung Corsetti, Frank |
| Abstract | The earthquake induced settlement of cohesionless sand or silty sands, has been the source of significant structural damage to bridges and buildings in past earthquakes. The procedure for evaluating the settlement of dry sands during earthquake ground shaking developed by Tokimatsu and Seed (1987) is widely used in engineering practice. The method recognizes that seismic settlement is controlled by earthquake induced cyclic shear strain amplitudes but was developed using experimental data based on cyclic laboratory tests on only one sand. In addition, the procedure is based on simplifying assumptions approximating earthquake site response, namely the concept of an equivalent number of uniform shear strain amplitude cycles with depth varying amplitude.; This study evaluates a simplified version of a constitutive model for the settlement of sands under non-uniform time varying cyclic shear strain amplitudes (originally developed by Martin et al. (1975)) in combination with a nonlinear site response program as a means of determining the earthquake induced settlement of sands in a more rigorous manner. Compilation of existing and new cyclic simple shear laboratory tests on several different sands also shows that settlements can be significantly greater or less than the data adopted for the Tokimatsu and Seed procedure. Constitutive model parameters adopted for the settlement analyses are shown to depend on the value of e-emin (where e is the void ratio) for a given relative density.; The results of the research clearly illustrate settlement sensitivity to sand particle characteristics. A simple approach based on void ratio parameters to characterize settlement potential and the new analytical methodology adopted as a design approach, overcomes the limitations of the Tokimatsu and Seed methodology. These parameters when combined with a time history site response analysis form the basis for the proposed new design methodology.; A basic understanding of volume change behavior under cyclic loading as described above is also fundamental to the understanding of liquefaction behavior of saturated sands under undrained conditions as reported by Martin et. al, 1975. The research also illustrates and reinforces this basic understanding. |
| Keyword | earthquke; settlement; liquefaction; sand's characteistics; void ratio |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m981 |
| Rights | Ramadan, Jamal Ibzahim |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Ramadan-20071214 |
| Archival file | uscthesesreloadpub_Volume14/etd-Ramadan-20071214.pdf |
Description
| Title | Page 1 |
| Full text | SETTLEMENT OF DRY COHESIONLESS SOIL DEPOSITS UNDER EARTHQUAKE INDUCED LOADING by Jamal I Ramadan _____________________________________________________________ A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (CIVIL ENGINEERING) December 2007 Copyright 2007 Jamal Ibrahim Ramadan |
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