Study on reduction of the wind load and the aerodynamics vibration of the bridge girder by the bridge appendages

采用风洞法研究了跨向非均匀截面附件对桥梁风荷载和空气动力振动的抑制作用。带展向非均匀截面的附属物能有效地减小作用在具有一定侧比的模型上的波动升力。对于其他边长比的模型，采用跨向非均匀截面开孔是有效的。对热线数据进行了光谱分析，以评估跨向相关长度。旋涡脱落频率下的相干值作为距离的函数绘制。它可以用高斯函数很好地表示，并以积分尺度导出相关长度。提出了利用自相关函数评价迎风相关长度的方法。

Study on reduction of the wind loads and the aerodynamics vibrations of bridge girder by appendages with spanwise inhomogeneous section was conducted using wind tunnel. The appendages with spanwise inhomogeneous section were effective on reduction of fluctuating lift acting on the models with some side ratio. For the models with other side ratio, openings with spanwise inhomogeneous section were effective.Spectral analysis of the hot-wire data was conducted for evaluation of spanwise correlation length. Coherence values at vortex shedding frequency were plotted as function of distance. It could be represented well by Gaussian function, and correlation length was derived as integral scale. Evaluation method of windward correlation length was also proposed with employing auto-correlation function.