平均风荷载作用下斜列三方柱的干扰效应研究

Study on the interference effect of oblique tri-square column under average wind load

方柱在土木工程结构中应用广泛,例如桥塔、桥墩、超高层建筑群等.本文通过某大桥的刚性模型测压风洞试验的方法,对单方柱、不同间距比下斜列三方柱绕流时的平均风压进行了研究,试验的雷诺数Re=3.2×10^(4).结果表明:斜列三方柱临界间距比范围为3.5≤(L/D)_(cr)≤4.0;当风向角较小时,平均风压干扰效应主要集中在中、下游方柱且为减小效应,中游方柱与下游方柱表现出相似的气动特性;随着风向角的增加,各方柱平均风压分布情况与单方柱类似,且方柱间相邻面上平均风压系数变化最为显著.

Square cylinders are widely used in civil engineering structures,such as bridge towers,piers,high-rise buildings and so on.In this paper,the mean wind pressure around a single square column and an oblique three-square column with different spacing ratio is studied by means of a rigid model wind tunnel test for a bridge,and the Reynolds number of the test is about 3.2×10^(4).The results show that the time averaged tap pressure coefficient interference effect is mainly concentrated in the midstream and downstream square cylinders when the wind attack angle is small,showing a decreasing effect,the midstream square cylinder and the downstream square cylinder show similar aerodynamic characteristics.With the increase of wind attack angle,the time averaged tap pressure coefficient of each square cylinder is close to the test results of single square cylinder,and the time averaged tap pressure coefficient changes most significantly on the adjacent surfaces between square cylinders.