DYNAMIC CHARACTERISTICS FOR A MIDDLE-RISE STEEL BUILDING AND EARTHQUAKE RESPONSE ANALYSES OF SOIL-STRUCTURE INTERACTION BASED ON MEASUREMENT DATA

Abstract

This paper describes the system identification of soil-structure interaction system based on earthquake observation data concerning a middle-rise steel building. The object building whose height is 44 m is used for school. Earthquake observations are performed in some stories of the building, ground surface and 30 m below ground. A sway-rocking model is applied for the analysis model. Natural frequencies and damping ratios of 1st mode are analyzed based on microtremors and measured earthquake waves. In analysis of earthquake responses, parameters are story stiffness and damping ratio of this building depending on vibration amplitude levels, and soil impedance.