Ahmed-W. Elgamal
Rensselaer Polytechnic Institute
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Featured researches published by Ahmed-W. Elgamal.
Engineering Geology | 1993
Mohamad F. Succarieh; Ahmed-W. Elgamal; Liping Yan
Abstract La Villita earth and rockfill dam in Mexico has been subjected to five major earthquakes during the period 1975–1985. The recorded time histories of crest acceleration and associated permanent displacements imply the occurrence of seismically induced localized stick-slip slope deformations. In this paper, the upstream-downstream seismic response of La Villita dam is investigated in detail. The dam vibration characteristics are represented by a one-dimensional shear-wedge elasto-plastic numerical model. Available bedrock acceleration histories are employed as input excitation and seismic response is calculated using a step-by-step time integration procedure. Crest acceleration histories are computed and further employed to predict the observed permanent displacements. For that purpose, an elastic-perfectly plastic single-degree-of-freedom (SDOF) model is used in a Newmark-type sliding mass analysis. The predicted SDOF permanent displacements are found to be similar to their recorded counterparts. Moreover, this yielding SDOF model is found to capture the peculiar asymmetric response characteristics associated with the evolution of stick-slip displacements, and observed in the recorded crest accelerations of La Villita Dam. Finally, the employed numerical procedures are found to demonstrate the possible development of additional permanent crest displacements during future seismic events.
Archive | 1994
K. Arulanandan; Ricardo Dobry; Ahmed-W. Elgamal; H. Y. Ko; B. L. Kutter; J. Prevost; M. F. Riemer; A. N. Schofield; R. F. Scott; R. B. Seed; R. V. Whitman; X. Zeng
As part of the VELACS (VErification of Liquefaction Analysis Using Centrifuge Studies) Project, a series of dynamic centrifuge model tests were duplicated at different Universities (U.C. Davis, UC Berkeley, Caltech, Cambridge, Colorado, MIT, Princeton, and RPI) to assess the repeatability of the test results and to provide a data base for a Class A (before the event) type prediction of the test results. This paper will present the results obtained on different centrifuges, the evaluation of the repeatability of the results, and discussions on the use fulness of the results for the validation of constitutive models and numerical procedures. The experience and lessons learnt from this practice show that standardization of dynamic centrifuge modeling is very important in order to achieve repeatability of test results. The results resented here are based on the materials published in a Proceedings of the VELACS Symposium.
Journal of Geotechnical Engineering | 1994
Mourad Zeghal; Ahmed-W. Elgamal
Journal of Geotechnical Engineering | 1995
Mourad Zeghal; Ahmed-W. Elgamal; H. T. Tang; J. C. Stepp
Journal of Geotechnical Engineering | 1996
Ahmed-W. Elgamal; Mourad Zeghal; Ender Parra
Journal of Geotechnical and Geoenvironmental Engineering | 1998
Korhan Adalier; Ahmed-W. Elgamal; Geoffrey R. Martin
Journal of Geotechnical Engineering | 1995
Ahmed-W. Elgamal; Mourad Zeghal; H. T. Tang; J. C. Stepp
Soils and Foundations | 1996
Ahmed-W. Elgamal; Mourad Zeghal; Vm Taboada; Ricardo Dobry
Journal of Geotechnical Engineering | 1996
Ahmed-W. Elgamal; Sreenivas Alampalli; P. Van Laak
Earthquake Engineering & Structural Dynamics | 1991
Ahmed-W. Elgamal