Abstract
Seismic performances of Lexington Dam during the 1989 Loma Prieta earthquake are assessed. Linear and nonlinear analyses are used to identify locations of tension zones where cracks are likely to occur. Numerical analyses are for longitudinal and transverse sections of the dam. Assessments of natural vibration characteristics of the dam are based on numerical simulation of geophysical and forced vibration testing procedures. Nonlinear analyses are based on equivalent linear and elastoplastic solution procedures. The acronyms of computer programs used are SHAKE, SHAKEM and FLAC. Analyses procedures and computer programs used are commonly used in dam engineering practice. Relative movements of observers representing onsite accelerometers are included. The information presented is expected to be of interest to engineers and seismologists in dam engineering practice.
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