覆冰拉线测风塔钢绞线预应力施加方法

Prestressing Application Method of Guyed Wind Tower with Ice-coated Cable

拉线测风塔是由直立的桁架结构塔身和沿高度方向斜向布置的数层钢绞线组成的高耸结构。在正常设计和建造的情况下,测风塔结构物发生破坏的概率之高在土工结构物中实属罕见。其中,有不少测风塔的结构破坏是在风荷载和覆冰荷载联合作用下发生的。目前,由于我国对覆冰荷载和风荷载联合作用下测风塔结构整体稳定性方面的研究还不够成熟,所以有必要进行如下研究。应用ANSYS有限元软件建立拉线测风塔模型,根据规范对其施加风荷载和覆冰荷载,通过改变钢绞线的预应力大小,观察塔身的节点位移情况,总结覆冰情况下拉线测风塔塔身位移规律,并最终确定更加合理的钢绞线预应力施加方法。

The guyed wind measuring tower was a high-rise structure composed of an upright truss structure and several layers of steel strands arranged diagonally along the height direction.The proportion of structural failure occurring under normal design and construction was high in civil construction.Many of them,there were some structural failures caused by the combined action of wind load and ice load.Nowadays,the analysis of the overall stability of the wind tower under the combined action of ice loads and wind loads in China was not mature.,so it was necessary to carry out the follow research.ANSYS finite element software was used to establish the guyed wind tower model,according to the code to impose the wind load and the ice load,by changing the intensity of the prestress of the steel strand,we observed the displacement of the tower node,summarized the rule of the cable wind tower displacement under the condition of ice covered,and finally determined the most reasonable method of prestress of the steel strand.