Quantification of variations in the dynamic characteristics of a tall structure based on the long-term wind response observation records

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We conducted continuous observation of wind-inducted response of a tall tower, and quantified dynamic properties of the tower varied with climatic conditions. First, we built an observation system to monitor the wind-inducted vibration of the structure, and conducted the long-term continuous observation. The climatic data such as temperature, wind speed and earthquake information reported by JMA are also collected. Next, natural frequency and damping ratio of the tower are identified from the observation results. Finally, we quantified seasonal variation and aging of the dynamic properties of the tower using the observation data and the climatic conditions.