by G. L. Fenves and S. Mojtahedi
Fenves, G. L., and S. Mojtahedi (1995). Effect of Contraction Joint Opening on Pacoima Dam in the 1994 Northridge Earthquake. SMIP95
Seminar on Seismological and Engineering Implications of Recent Strong-Motion Data, p. 57 - 68.
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Pacoima Dam is constructed as cantilever monoliths separated by vertical
contraction joints. A seismic safety evaluation of an arch dam often relies
on a linear dynamic analysis assuming the dam is a monolithic structure.
The CDMG network of strong motion accelerometers recorded the canyon and
dam response in the 1994 Northridge earthquake. An analysis of dam models
for the earthquake shows that joint opening occurs and that it redistributes
the stresses in the dam. The effects of non-uniform free-field motion were
found to be important on the stresses and joint opening displacements.