串列双塔柱风荷载及涡振性能研究

为研究双柱式桥塔的抗风性能，以实际桥塔为工程背景，采用CFD数值模拟方法分析了两串列带圆角方柱的非定常绕流。在验证分析方法可靠性的基础上，研究了风速、风向角和间距比对截面气动力系数的影响，并进一步研究了各塔柱及桥塔整体的涡振性能，对比了由于上游、下游塔柱侧力大小及变化趋势不同而造成桥塔扭矩增大的效应。研究结果表明:间距比的不同将显著改变串列塔柱气动特性，其临界值约为3，此时两柱阻力系数之和最小，侧力系数均方根值接近零。

WIND LOADS AND VORTEX-INDUCED VIBRATION OF TWO TOWER COLUMNS IN TANDEM ARRANGEMENT

To investigate the wind-resistant behaviour of a two-column tower,the CFD numerical simulation was adopted to analyze the unsteady flow around two rectangle columns with round corner in tandem arrangement according to an actual bridge tower.The effect of wind velocity,wind direction and spacing ratio on aerodynamic coefficients of the tower cross section were analyzed after checking the reliability of the analysis method,and the vortex-induced vibration of each column and the whole tower were further explored.Moreover,the magnitude and the change trend of lateral force of upstream and downstream column were compared to study their effect on the increase of tower torsional moment.The results show that aerodynamic characteristics of tower columns in tandem arrangement are significantly affected by the spacing ratio and the critical value is about 3,where the sum of drag coefficient of each column is the minimum and the root mean square value of lateral coefficient is close to 0.