考虑山顶地形三维效应某电视塔测力风洞试验

Wind tunnel force balance test of a TV Tower structure considering three-dimensional effects of mountain topographic

以位于南京秀山顶部某电视塔为例,为精确考虑三维地形效应对电视塔风荷载设计取值的影响,首先对电视塔周边800 m内的山顶地形进行风洞试验,获取电视塔结构参考高度处的风速修正系数;然后利用高频动态天平测力(HFFB)技术进行不同风向角下电视塔刚体模型测力试验。基于试验结果,提炼出不同风向角下电视塔结构基底等效内力和顶部峰值加速度响应的分布规律,并分析典型最不利风向角下电视塔结构层等效静力风荷载(ESWLs)分布特性。研究结果表明:山顶地形三维效应对于此类电视塔结构风力分布的影响显著。本文试验和相关结论可为此类山顶地形电视塔结构抗风设计提供参考。

Taking a television （TV） tower located at the top of Xiushan Mountain in Nanjing as an example, and toprecisely know the 3D effects of mountain topographic on the tower of wind load influence design value, the terrain windtunnel tests were performed in the mountainous area within 800 m from the TV tower. The wind speed correction factorof TV tower at reference height were obtained. According to the technology of high frequency force balance （HFFB）, theforce balance tests of rigid model under different wind angles were performed. The distribution rules of equivalentinternal force of basement and peak acceleration response on the top of tower were extracted based on the test results.Analysis of the distribution characteristics of ESWLs under the worst wind directions was also performed. The resultsshow that the wind distribution of this type TV tower has been effected by 3D effects of mountain topographicsignificantly. The test method and the relative conclusions of this article are reliable and convenient reference to this typeof TV tower located at the top of Mountain.