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논문 기본 정보

자료유형
학술저널
저자정보
Wu, Wen-Hwa (Department of Construction Engineering, National Yunlin University of Science and Technology) Chen, Chien-Chou (Department of Construction Engineering, National Yunlin University of Science and Technology) Shi, Wei-Sheng (Department of Construction Engineering, National Yunlin University of Science and Technology) Huang, Chun-Ming (Intelligent Electronic Systems Division, National Chip Implementation Center, National Applied Research Laboratories)
저널정보
테크노프레스 Smart structures and systems Smart structures and systems 제20권 제2호
발행연도
2017.1
수록면
231 - 246 (16page)

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A recent work by the authors has demonstrated the feasibility of scour evaluation for Kao-Ping-Hsi Cable-Stayed Bridge simply based on ambient vibration measurements. To further attain the goal of scour monitoring, a key challenge comes from the interference of several environmental factors that may also significantly alter the pier frequencies without the change of scour depth. Consequently, this study attempts to investigate the variation in certain modal frequencies of this bridge induced by several environmental factors. Four sets of pier vibration measurements were taken either during the season of plum rains, under regular summer days without rain, or in a period of typhoon. These signals are analyzed with the stochastic subspace identification and empirical mode decomposition techniques. The variations of the identified modal frequencies are then compared with those of the corresponding traffic load, air temperature, and water level. Comparison of the analyzed results elucidates that both the traffic load and the environmental temperature are negatively correlated with the bridge frequencies. However, the traffic load is clearly a more dominant factor to alternate the identified bridge deck frequency than the environmental temperature. The pier modes are also influenced by the passing traffic on the bridge deck, even though with a weaker correlation. In addition, the variation of air temperature follows a similar tendency as that of the passing traffic, but its effect on changing the bridge frequencies is obviously not as significant. As for the effect from the alternation of water level, it is observed that the frequency baselines of the pier modes may positively correlate with the water level during the seasons of plum rains and typhoon.

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