Bridges boom Numerical Study of Aerodynamic Performance
|School||Huazhong University of Science and Technology|
|Keywords||Wind load VIV ANSYS CFX Aerodynamic Characteristics Wind attack angle|
Stability and security of the bridge except by the weight and structural design effects, wind load factor can not be ignored . The role of wind on the bridge , including the role of static and dynamic action two, and VIV is the most common dynamic action of wind on the bridge one . Although it does not cause catastrophic damage , but it happens with low wind speed , high frequency, can cause structural fatigue damage . VIV more prone to damping occurs on a smaller elongated structures . As the modern architecture multi-directional long , soft , thin, weak damping direction, so the structure engineers on VIV increasingly high degree of concern . Nanjing Yangtze River Bridge is the Ministry of Railways plans Dashengguan transport hub bridge , its main bridge six -span continuous steel truss arch bridge , each truss span of three load-bearing structure . Bridge the longest boom over 50 meters , so slender boom occurred VIV possibility is very significant. This article 's main job is through numerical simulation method to study the two-dimensional static bridge suspenders aerodynamic characteristics , and to further study the bridge suspenders provide a basis for VIV . In this paper, large general-purpose computational fluid dynamics software ANSYS CFX, the bridge cross-sectional shape of the three reference flow simulation around a boom for the boom -dimensional model and ANSYS CFX meshing have passed a professional pre-processing software ICEM- CFD achieved. By analyzing the rectangular cut corner rectangles, rounded rectangles three kinds of aerodynamic performance of the boom section , to study the cross-sectional shape of the boom aerodynamic effects , to choose the best cross-section , the system to achieve the best effect of vibration . In the above work done , based on the cutting angle rectangular section was further discussed , taking into account the actual situation of the project , in the case of a wind angle of attack on the single and dual flow around booms were simulated , and in both cases the calculation of the results were analyzed to obtain the most unfavorable wind angle of attack range and two boom angle of attack from the mutual interference value .