丘陵地における埋土地盤及びその上に建つ構造物の振動性状 : 境界要素法による理論解析的考察

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The purpose of this paper is to clarify dynamic properties of a hilly area with topographic irregularity and a reinforced concrete structure (4-stories) located on that area, by observational and analytical approaches. In the observational approach, microtremores installed on a real fill ground with topographic irregularity, were observed along a measurement line. On the other hand, in the analytical approach the real fill ground is idealized into a visco-elastic body by boundary element method. This model ground is composed of a half space with a cavity, and the cavity represents the fill ground. The structure is also idealized as a visco-elastic body. For incident SH waves, frequency response analysis is carried out in this system, and frequency response properties of the model ground and structure and obtained. Results are summarized as follows: (1) The hilly area has a local amplification effect. Namely it has some uni-predominant frequency and the amplitude factor increases according to the thickness of a hilly area. (2) The stiffness of the hilly area is greater than that of the equivalent horizontal soil layer. (3) Frequency response properties obtained by boundary element method well correspond to results of microtremor observations. (4) In the case of the structure on the hilly area, stress concentrations are created in each part of the structure on boundaries of the fill ground by the local amplification effect.
社団法人日本建築学会の論文
1989-06-30

丘陵地における埋土地盤及びその上に建つ構造物の振動性状 : 境界要素法による理論解析的考察

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