【作者】 张猛； 李天祥； 陈怡卓； 赵桂峰；

【Author】 Zhang Meng;Li Tianxiang;Chen Yizhuo;Zhao Guifeng;School of Civil Engineering,Zhengzhou University;

【机构】 郑州大学土木工程学院；

【摘要】 针对附有三板式螺旋侧板的高杆灯风致动力影响问题展开三维数值模拟研究,基于双向流固耦合数值模拟方法分析高杆灯结构在不同风速条件下、外附不同螺旋侧板对高杆灯风振响应的影响,得到侧板螺距P、侧板高度H与结构振动控制效果之间的联系。通过数值模拟分析得到:高杆灯结构在风速5～8m/s范围内出现明显的横风向涡激振动现象,当来流风速达到6 m/s时涡激振动现象最为显著,此时涡激振动主要受第三模态影响;外附螺旋侧板对高杆灯的顺风向响应有一定的放大作用,对高杆灯的横风向涡激振动响应有较明显的抑制作用;在侧板高度相同时,螺距越小,对高杆灯振动的抑制效果越好,侧板螺距P为7.5D(D为第三模态临界直径)时,抑制效果较好;在螺距相同时,外附螺旋侧板的高度越大,对高杆灯振动的抑制效果越好,但侧板过高会对结构顺风向响应产生过大的不利影响,综合对比后,选择侧板高度H=0.20D为最优侧板高度。更多还原

【Abstract】 A three-dimensional numerical simulation study is carried out on the wind-induced force of high pole lamp with three plate spiral side plates.Based on the two-way fluid structure coupling numerical simulation method,the influence of high pole lamp structure with different spiral side plates on the wind-induced vibration response of high pole lamp under different wind speeds is analyzed,and the relationship between the side plate pitch P,side plate height H and the structural vibration control effect is obtained.Through numerical simulation analysis,it is found that the high pole lamp structure has obvious cross wind vortex induced vibration in the wind speed range of 5～8 m/s,and the vortex induced vibration is the most significant when the incoming wind speed reaches 6 m/s.At this time,the vortex induced vibration is mainly affected by the third mode.The external spiral side plate can amplify the downwind response of the high pole lamp to a certain extent,and can significantly inhibit the cross wind vortex induced vibration response of the high pole lamp.When the side plate height is the same,the smaller the screw pitch is,the better the suppression effect on the vibration of the high pole lamp is.When the side plate screw pitch P is 7.5D(D is the critical diameter of the third mode),the better the suppression effect is.When the screw pitch is the same,the greater the height of the external spiral side plate,the better the suppression effect on the vibration of the high pole lamp.However,the too high side plate will have an excessive adverse impact on the downwind response of the structure.After comprehensive comparison,the side plate height H=0.20D is selected as the optimal side plate height.更多还原