سال انتشار: ۱۳۸۲
محل انتشار: چهارمین کنفرانس بین المللی زلزله شناسی و مهندسی زلزله
تعداد صفحات: ۸
Ali NIOUSHA – Senior Research Engineer, Kajima Technical Research Institute, Tokyo, Japan,
Yukio NAITO – Supervisory Research Engineer, Kajima Technical Research Institute
Tomoki HIKITA – Research Engineer, Kajima Technical Research Institute
Tomoki HIKITA – Nikken Sekkei Ltd., Tokyo, Japan
The determination of the dynamic characteristics of actual structure using vibration measurements is a primary interest in structural engineering. In this paper the dynamic characteristics of a 35-story high-rise building are investigated for microtremor measurements.The modal parameters of the fundamental mode (natural frequency and damping) are obtained and discussed using recursive discrete-time modeling and spectral method. The effect of rocking motion on the results of dynamic characteristics of the building is discussed. A proposed method to calculate the transfer function considering the rocking motion using the spectral analysis is addressed and its effectiveness has been shown. It is also shown that in the recursive modeling, since the noise is removed from signal over the whole frequency band, short length of data is enough to obtain accurate modal parameters. This may reduce the time of the observation.