by F. Makdisi, C.Y. Chang, Z. Wang and C. Mok
Makdisi, F., C.Y. Chang, Z. Wang and C. Mok (1991). Analysis of the Recorded Response of Lexington Dam During Various Levels of Ground Shaking. SMIP91
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 10-1 - 10-10.
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Lexington Dam, a 200-foot-high compacted earthfill embankment, was strongly shaken by the Loma
Prieta 1989 earthquake (Mw 7) as well as by two smaller events (ML 5) in June 1988 and August
The dam was instrumented as part of the California Strong Motion Instrumentation Program. The
recordings at Lexington Dam due to at least three different levels of ground shaking provided
valuable data for examining the nonlinear strain-dependent behavior of the embankment materials
due to earthquake shaking. This paper summarizes the results of analyses of the recordings at
the dam crest and abutment for two of the three earthquakes described above. The analyses
included Fourier spectral ratio computations (crest to abutment) to examine changes in the
fundamental natural period of the dam due to different levels of shaking; and one- and two-
dimensional dynamic response analyses to evaluate the nonlinear strain-dependent behavior of
the embankment materials at two levels of earthquake shaking.