A Simulation of the Quake-response on the Frame with Large Basement-box under the Earthquake from Deep Soil Layer

by Fukuzo Suto, Tokyo Denki Univ, Tokyo, Japan,

Abstract: This paper treats a study of computing vibratory analysis and its comparison with measurements for the earthquake-responses on an actual 19 storied pure frame-structure with its height of about 65 meters above ground and a massive rigid body embedded 15 meters underground in the form of a large parallelepiped concrete box having two basement-floors and soil mass within. For its analysis in this case, the author follows the theoretical formula derived by Dr. H.Tajimi. lt deals with dynamic analysis on a rigid cylindrical body embedded in an elastic stratum for the investigation of the radiation damping due to the interaction between soil and rigid body combining with a multi-masses structural system on it. In order to adapt this case for the Tajimi's theory its embedded parallelepiped body is approximately replaced by an equivalent circular cylindrical body. Then the solution for the quake-response is carried out using the Fourier Transformation method through complex valuables for the interactive problem inclusive of upper multimasses response system. On the other hand, for knowing the actual earthquake-response behavior an automatic measuring system controlled by two microcomputers has been installed (Ref.2.5). In this place the simulated structural response-waves enforced by the actual waves acquired at the underground level of 59 meters are compared with those measured waves at the level of GL-24m, GL-12m and GL+60m. Finally the author concludes the computational results after the Tajimi's theory will be able to give a comprehensible approximation as a whole when compared with the actual behavior, if the parameters related would be decided properly to the structural system.

Subject Headings: Soil analysis | Earthquakes | Structural systems | Elastic analysis | Soil dynamics | Soil treatment | Comparative studies | Vibration

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