To investigate the spanwise correlation of vortex-induced forces (VIF) of a typical section of a streamlined box girder, wind tunnel tests of simultaneous measurement of force and displacement responses of a sectional model were conducted in a smooth flow. The spanwise correlation of VIF and pressure coefficients on the measurement points of an oscillating main deck were analyzed in both the time domain and frequency domain, respectively. The research results indicated that the spanwise correlation of VIF and pressure coefficients on the measurement points were related to the amplitudes of vortex-induced vibration (VIV), both of them weakened with the increase of spanwise distance; the maximum value of spanwise correlation coefficient is situated at the ascending stage of the lock-in region, rather than at the extreme amplitude point. The amplitudes of VIV showed different impacts on the spanwise correlation of pressure coefficients on the measurement points of the upper and lower surfaces, for which the maximum value of the spanwise correlation coefficients is located at the extreme amplitude point and the ascending stage of the lock-in region, respectively. Furthermore, the spanwise correlation of the pressure coefficients decreases continually from the upstream to downstream of the main deck; large coherence of vortex-induced forces and pressure appears around the frequency of vortex shedding, and the coherence of VIF and pressure becomes smaller with the increase in the spanwise distance.

中文翻译：

---

大尺度截面模型涡激力展向相关性的实验研究

为了研究流线型箱梁典型截面的涡激力 (VIF) 的展向相关性，在平稳流动中进行了同时测量截面模型的力和位移响应的风洞试验。分别在时域和频域分析了振动主甲板测量点上的 VIF 和压力系数的展向相关性。研究结果表明，VIF与测点压力系数的展向相关性与涡激振动（VIV）的幅值有关，两者均随着展向距离的增加而减弱；展向相关系数的最大值位于锁定区域的上升阶段，而不是振幅极值点。VIV的幅值对上下表面测点压力系数的展向相关性表现出不同的影响，其中展向相关系数的最大值位于极幅点和锁定上升阶段。在地区，分别。此外，压力系数的展向相关性从主甲板的上游到下游不断减小；在涡旋脱落频率附近出现涡致力和压力的大相干性，随着展向距离的增加，VIF和压力的相干性变小。其中展向相关系数的最大值分别位于锁定区域的极端幅度点和上升阶段。此外，压力系数的展向相关性从主甲板的上游到下游不断减小；在涡旋脱落频率附近出现涡致力和压力的大相干性，随着展向距离的增加，VIF和压力的相干性变小。其中展向相关系数的最大值分别位于锁定区域的极端幅度点和上升阶段。此外，压力系数的展向相关性从主甲板的上游到下游不断减小；在涡旋脱落频率附近出现涡致力和压力的大相干性，随着展向距离的增加，VIF和压力的相干性变小。