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天津慈海桥是一种将斜拉桥和摩天轮合二为一的复合结构,为了综合理解和判断结构在风力作用下的动力特性,研究由于空气尾流作用引起的振动现象,建立复合结构的3种风洞试验模型。通过风洞试验测量,得到不同的风向与桥轴方向角度工况下的风力系数,并通过试验观察及数据分析对空气尾流振动现象发生的情况进行判断。试验及分析结果表明,在整体结构完成后不会发生空气不稳定振动现象,但在施工中只有主塔的情况下,如果共振风速与设计风速相近时,存在空气不稳定振动现象,可采取倒Y塔架间设置隔板的措施提高主塔的刚度,进而避免空气不稳定振动现象的发生。
Tianjin Cihai Bridge is a kind of composite structure combining the cable-stayed bridge and the ferris wheel. In order to comprehensively understand and judge the dynamic characteristics of the structure under the action of wind, the vibration phenomenon caused by the wake of the air wake is studied, and the composite structure Three kinds of wind tunnel test model. Through the wind tunnel test and measurement, the wind coefficients under different wind directions and axial directions of the bridge shaft are obtained, and the judgment of the occurrence of air wake vortex phenomenon is made through experimental observation and data analysis. The results of the test and analysis show that the unstable structure of the air will not occur after the completion of the whole structure. However, if only the main tower is used in construction, if the resonance wind speed is close to the designed wind speed, Y between the tower to set the diaphragm measures to improve the rigidity of the main tower, and thus avoid the phenomenon of air vibration instability.