1000 kV干字型铁塔风振系数研究

Research on wind-induced vibration coefficient of 1000 kV“干”type tower

针对福州-厦门1000 kV干字型耐张铁塔的结构抗风性能,在ANSYS软件中建立杆梁混合模型,由AutoCAD铁塔组装图计算挡风面积,采用AR法模拟风速时程并计算风荷载,通过时域法完成铁塔风振系数计算.仿真结果表明:与建筑规范相比,干字型铁塔的风振系数随高度增加而呈非线性、曲折形增长,其分布特性与铁塔质量和挡风面积的比值有关;由AutoCAD铁塔组装图计算挡风面积与填充系数为0.1925时的经验公式计算结果较为接近,但是在横隔面处二者面积计算值差异比较大,也导致两种方法所得到的风振系数在横隔面处存在较大差异.

Aiming at the wind resistance performance of Fuzhou-Xiamen 1000 kV“干”type tensile tower,the link and beam hybrid model is established in ANSYS software.The windshield area is calculated by AutoCAD tower assembly drawing.The wind load is simulated by AR method,and the wind-induced vibration coefficient of the tower is calculated by time domain method.The simulation results show that compared with the building code,the wind-induced vibration coefficient of the“干”type tower increases nonlinearly and zigzag with height,and its distribution characteristics are related to the ratio of tower quality and wind-shield area.When calculating the windshield area,AutoCAD method and the empirical method whose filling factor are 0.1925 is very close,but the difference in the calculated area at the cross-section is relatively large,and the wind-induced vibration coefficient obtained by the two methods is also different at the cross-section.