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 Structural and Environmental monitoring of Thuan Phuoc bridge
Tác giả hoặc Nhóm tác giả: Hiroshi Katsuchi, Hitoshi Yamada, Mayuko Nishio, Yukihisa Kuriyama, Naoya Kasai, Phan Cao Tho, Le Van Lac, Nguyen Lan, Nguyen Van My and Nguyen Duy Thao
Nơi đăng: The transport infrastructure of vietnam with sustainable development; Số: ISBN 978-604-82-0019-0;Từ->đến trang: 11-18;Năm: 2013
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
ABSTRACT
Thuan Phuoc Bridge is the longest suspension bridge in Vietnam, which has the center span of 405 m, two side spans and a steel closed-box deck. It was completed in 2009 and located at the river mouth of Hang in Danang City. So the bridge is subject to a strong corrosive environment while it functions as an arterial road between the Danang Port and the city center. In addition, recently problems of large traffic-induced vibration of the deck have risen. Based on these circumstances for the bridge, Yokohama National University and Danag University of Technology, which had signed academic exchange agreements in 2011, organized a collaboration research team to conduct monitoring work on corrosion and structural integrity of the Thuan Phuoc Bridge. The team is also supposed to work for the development of maintenance work strategy of the bridge. Corrosion monitoring is carried out by the combination of an electro-chemical sensor and a rust thickness sensor. These data has been logged and transmitted for more than half a year since July 2012. Measured data by both sensors are in good correlation. Two phases are observed: almost linear growth of rust in the first period and then almost saturation of the growth of rust in the second period. Based on this information, residual life can be estimated. Structural integrity is assessed through vibration measurement of the bridge. Vibration data was measured by accelerometers attached on the deck and analyzed by a FFT technique to get natural frequencies and by an ERA (Eigen system Realization Algorithm) method to identify structural damping and vibration mode shapes. Vibration measurement was carried out twice since July 2012. It was also carried out with several loading conditions (traffic patterns) including ambient vibration. Natural frequencies measured are in good agreement with FEM analysis results in design documents. Results obtained so far can be used as the baseline of bridge condition. Continuing the monitoring of the Thuan Phuoc Bridge will provide wider and deeper understanding on the bridge conditions and in addition lead to the establishment of a good maintenance strategy
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