Abstract
For the asseismic design of building structures, civil engineers have been interested in the dynamical interaction characteristics of structures with buried foundation in a soft soil ground. In this paper are presented some results on the dynamical interaction chracteristics of two rigid structures separately embeded in an elastic surface layer. The out line will be described in following items below : 1. When the ratio of the distance between structures to the depth of those embeded foundation is larger than 5, and the nondimensional frequency parameter is from zero to π/2, the dynamical stiffnesses of sub-side soil ground by taking of the adjacent structure are nearly equal to ones in the case of the infinite surface layer. 2. In the case of the preceding parameter ranges, the dynamical soil pressure subjected to horizontal base rock motion nearly equals to be one in the case of infinite layer. 3. And so, each interaction frequency response curve of structures in the preceding parameter ranges equals to be that of each in the infinite surface layer, respectively. 4. On the other hand, when the ratio of the distance between structures to the depth of those embeded foundation is smaller than 5, each first resonance frequency of structures is higher than of each in the infinite surface layer, respectively. 5. And, there is one absorption frequency in each interaction frequency response curve.
