| The current version does not support copying Cyrillic text to the Clipboard. You should activate the programsolve the differential equation of single pile horizontal vibration. Hence it is convenient to consider the influence upon impedance produced by pile length and the soil under piles. The calculation examples demonstrate that the soil under piles will greatly influence the impedance of single piles.3.Dynamic interaction factor and displacement method are adopted to derive vertical, torsional, rocking, horizontal and coupled horizontal-rocking vibrations of pile groups under rigid bearing-cap in homogeneous elastic soil, homogeneous viscoelastic soil and inhomogeneous viscoelastic soil. Displacement method is more explicit in conception, more simplified in derivation and less sophisticated in calculation than force method. In terms of Gazetas's three step procedure for pile-soil-pile interaction in homogenous media a new method for calculating dynamic interaction factors of layered-soil is suggested under harmonic, Rayleigh wave and SH wave excitation and the simplified scheme applied to interaction of pile-groups and soil is further extended.4.It is the most difficult for analysis of dynamic soil-structure interaction that the test data is poor. So the theoretical analysis of dynamic soil-structure interaction is accepted and its application is limited. But in this paper a 1:2 model test of dynamic soil-pile-frame structure interaction is researched. As known, the test is the biggest one of interrelated tests. Under harmonic and impulsive excitation at top of the model, lots of test data are got. These data will be benefit to identify the dynamic interaction mechanism of soil-foundation-superstructure and approve the theory of dynamic soil-pile-superstructure.5.A simplified formula that can be used widely is developed to calculate fundamental period of interaction systems. The comparison between test data demonstrates its precision.
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