This paper deals with the dynamic behavior of a mass or a structure on an elastic homogeneous stratum subject to earthquake motion. The procedure employed in this paper begins with the establishment of a finite number of masses and springs which represent a stratum from the standpoint of soilstructure interaction. An effective lateral extent of soil mass is determined in order to define the system. Comparison with the experimental results taken from previous paper (R. N. Arnold, 1955) shows good agreement with the computed results. Natural periods of buildings on a stratum are investigated in connection with properties of soil.

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Earthquake can be considered to have two different characters, cyclic loading and random pulsative loading. As structures are apt to oscillate at their natural frequencies, the random pulsative loading is considered the important part of earthquake.In the present study the dynamic response characters of soft saturated clays under an impact load have been investigated by subjecting the material to test under simply simulated earthquake in the triaxial cell. Three types of test adopted are those of the longitudinal impact vibration test, the torsional impact vibration test and the longitudinal forced vibration test.

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