抄録
A semi-empirical expression has been derived for the fundamental period of large earthfill and rockfill dams. Derivation is based on analytical solutions and has been calibrated using the empirical data available. Analytical solution involves a heterogeneous shear wedge with a realistic distribution of small-strain shear modulus. The effect of the "third dimension" has also been taken into account by making use of two and three dimensional finite element and shear wedge solutions, and a simple expression has been derived by the aid of a single degree of freedom idealization. Empirical data come from forced vibration tests and response observations during small earthquakes. Recently the fundamental period of a large rockfill dam became available which had not been used in the development of the period expression presented. The accurate prediction of the period of this dam has shown that the equation will be useful in practice for estimation of the small strain fundamental periods of large dams.
