STRUCTURE OBSERVATION &IDENTIFICATION CONSIDERING SOIL-STRUCTURE INTERACTION OF STORY STIFFNESS AND DAMPING RATIO OF 8-STORY STEEL ENCASED REINFORCE CONCRETE STRUCTURE BY MICROTREMOR
Supervisor: Koichi MORITA
The author attempts to consider the effect of soil-structure interaction by identifying the dynamic parameters of an existing building. Target building is an 8-story steel encased reinforced concrete building which was constructed in 1998. In the study, an eight degree of freedom analytical model is utilized to analyze the data from microtremor measurement. Then, nonparametric and parametric techniques are employed to determine natural frequency, damping ratio and story stiffness of the structure. For these two cases, one is without considering the effect of soil-structure interaction; the other is with considering the effect of soil-structure interaction. Comparing the results of these two cases, the effect of soil-structure interaction can be confirmed. Nonparametric methods include the well known transfer function and Random Decrement method. The parametric method employed herein is the off-line system identification method ARX (Auto-Regression with eXtra input).
|Citation: ||Bulletin of IISEE, 44, 67-72.|