DYNAMIC RESPONSES OF FLEXIBLE RECTANGULAR FOUNDATIONS EMBEDDED INTO A VISCOELASTIC HALF-SPACE TO OBLIQUELY INCIDENT WAVES
1988 年 28 巻 1 号 p. 56-64
詳細
1988 年 28 巻 1 号 p. 56-64
The boundary element method expanded in frequency domains is presented to analyze the dynamic interaction between an embedded flexible rectangular foundation and soil with consideration of the obliquely incident waves. Numerical results describing the influence of the flexibility of the foundation on the dynamic responses of the foundation due to obliquely incident waves indicate that the flexibility of actual foundations can diminish the reduction of translation responses and increase the rotational responses in the high frequency range. These phenomena are more conspicuous as the embedment ratio is larger and the value of the wave velocity ratio of the soil and the foundation approaches to unity. When the high frequency components of the input ground motion are important and the basement has higher flexibility (for example 2vs/1vs >0.4), the analysis method which considers the basement as a rigid foundation may lead to unsafety estimations and the estimation of the flexibility of the foundation is necessary as analysing the effective input motion with consideration of the incident waves.
