ブロック基礎の起振機実験結果に基づく成層地盤の動的相互作用問題の一考察

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The purpose of this paper is to clarify the general nature of complex stiffnesses in dynamic soil-foundation analysis based on the results of past vibration tests of foundation blocks on the ground. To this end, the reports which showed such frequency dependent complex stiffness resulted from vibration tests have been collected for the swaying, rocking and vertical cases. In recent years, attempts of the experiment on the ground have been carried out energetically in order to grasp the actual behaviors of soil-foundation interaction. Each vibration test was performed for a particular object such as discussing the avaiability of a newly constructed theory and investigating the characteristics of the interaction on its test site. In this paper, the synthetical tendency of the soil-foundation interactions is discussed by means of the non-dimensional expression based on many collected data. It is considered that our discussions are useful to predict actual behaviors of interaction problems and establish dynamic criteria for the aseismic design of structures influenced by such interaction effects. Since most vibration tests of foundation blocks have been performed on a stratum, it is necessary to analyze systematically these data to clarify the effect of a stratum, which can be represented by some parameters. Therefore, the solution of layered media based on three-dimensional wave propagating theory is adopted to compare the test data with analytical solution. As the good agreement between the test data and theoretical solutions is obtained, it can be confirmed from this study that complex stiffnesses, especially the damping coefficients are much affected by a stratum.
社団法人日本建築学会の論文
1986-05-30

ブロック基礎の起振機実験結果に基づく成層地盤の動的相互作用問題の一考察

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