Chaotianmen Yangtze River Bridge in China is a semi‐supporting, steel‐truss, and tied arch bridge with a main span of 552 m, marking the world's longest center span of the same type. The wind‐resistant behavior under yaw winds was investigated via wind‐tunnel tests of 1:100 scale‐downed full bridge aeroelastic models. The service stage and four key construction stages were considered in the tests. The tests were carried out in both smooth and simulated boundary layer wind fields with various wind yaw angles. The aeroelastic models were elaborately designed and manufactured, and the dynamic properties in every stage were investigated before the tests. The results show that the bridge has enough aerodynamic stability for all stages and different yaw wind angles, and the most unfavorable buffeting responses occur in yaw wind case with a yaw angle at 0°.
The accurate calculation of transmission line modes is very important for power line design, the dynamic properties, anti-vibration, anti-galloping analysis. However, the existing simplified theories and models will Cause large calculation error. Based on the strain - displacement relationship of spatial curved beam theory, a three-node curved beam power line element was realized, which was used to take a modal analysis. The results show that the curved beam element used to calculate modes of power line is accurate. The results of the analysis were compared with results of only considering translation of power line, results of considering axial deformation and bending. The results of parametric analysis show that the bending cross-section modulus of the transmission lines has a greater impact on the translation and rotation frequency. The iced conductor eccentricity can slightly reduce the frequency of wire.
Wind load on complex-shape building, the wind tunnel test and numerical simulation were carried out. The two technologies supplement each other and their results meet well. There are mainly positive pressures on the windward surface, negative pressures on the roof, the leeward surface and the side. Especially, negative pressure is higher in the leeward region of the building corner. Its effect induced by the shape of the complex-shape building is remarkable.
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