期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2016
卷号：5
期号：7
页码：13258
DOI：10.15680/IJIRSET.2016.0507092
出版社：S&S Publications
摘要：Aerodynamic stability of a proposed Cable Stayed Prestressed Concrete Bridge of span 480 m underwind loads have been studied. Flutter and buffeting responses due to wind loads was investigated on a sectional modeto the scale of 1:200. The model was tested in a wind tunnel for two values of structural damping (0.03 and 0.06) inboth torsional and vertical motions with different combinations of live loads at the ratio of frequencies of torsional andvertical oscillations is equals to 1.2. The model exhibited coupled vertical and torsional oscillations in wind. Inaddition, another uncoupled mode in the form of rolling oscillation about the longitudinal axis of the tunnel was alsoconsistently observed. This type of oscillation has not been reported in the literature and is believed to be due to theovertone flexural oscillation of the main span of the bridge. After trying out several curative measures, it was foundthat provision of small holes in the bottom of the deck, controlled the vertical and rolling oscillations. The test resultswere compared with the theoretical (design) values and conclusions drawn for predicting flutter and buffetingresponses due to wind loads.
