Experimental Study On Cable Surface Effect Of Aerodynamic Characteristics

Cable-stayed bridge, with extremely high aesthetic value and the remarkable spanning capacity, is acting as one of the popular bridge types, and it is drawing more and more people’s attention since cable-stayed bridge advent. However, for the sun and dust contamination, the cable surface will be changed. Nobody can give an accurate calculation method to compulation aerodynamic force and the mechanism of vibration problem of high wind speed. Therefore, simulation on the cable surface of roughness to measure the aerodynamic force is meaningfulThe main content of this work summarized as follows:(1) To demonstrates the importance of the aerodynamic performance of stay-cables research, and summarizing predecessors’ research on Reynolds number effect method and the conclusion of the cylindrical structure.(2) Using roughness tester to measure surface roughness of smooth model and seven kinds of sand paper model, and describing roughness with quantitative indicators. Using balance to end load test, the average drag coefficient, average of lift coefficient, and fluctuating drag coefficient, fluctuating lift coefficient are obtained under different roughness model, changing with the Reynolds number, compares the different roughness under the maximum lift coefficient and drag coefficient of the relationship between the minimum value.(3) By comparing the average drag coefficient, the average lift coefficient, and resultant coefficient to Wind-resistent Design Specification for Highway Bridges, and in Sutong Bridge and Nanjing Yangtze River Second Bridge of stay-cables PES7-139 model as an example to calculate the actual wind load, to compare the experimental data to the Bridge code data to give some advice.(4) Studying the flow field distribution of different roughness model. Through the analysis of the time history and spectrum of different models, we got the changing of the time history and spectrum in the different Reynolds number regime, and analysis Strouhal number with the change of Reynolds number in different model.