【摘要】 以建设中的晋东南—南阳—荆门1000kV特高压输电线路为工程背景,针对输电铁塔风致响应较复杂的特点,进行了气弹模型风洞实验。输电塔气弹模型采用刚性节段加"V"型弹簧片法设计,通过分析实验结果,获得了铁塔的气动力系数和风振响应等数据。在单维多变量随机风场合成方法的基础上,引入了纵向与竖向脉动风速的交叉谱的影响,模拟了三维脉动风速时程。采用抖振响应的时程方法,分析了输电塔线体系的顺风向风振响应,其计算值与实验值吻合较好。结果表明,在风荷载作用下,输电导线与铁塔的相互耦合作用不可忽略。更多还原

【Abstract】 Taking the 1 000 kV UHV transmission project from Jindongnan through Nanyang to Jingmen being constructed as research background, according to the feature that the wind-induced response of transmission tower is complicated, the wind tunnel tests for aeroelastic model were performed. The aeroelastic model of the tower is designed by use of rigid subsections with "V" shaped spring added. Through the analysis on experimental results, the data of aerodynamic coefficient and wind-induced response of the transmission tower is obtained. Based on the one variable multi-dimension spectral representation method, the cross-spectrum of the vertical wind and the portrait wind has been considered. The time-history method of the buffeting response is used for the wind-induced analysis of the transmission line system, the results and the test values are in good agreement. Research results show that under the wind load the coupled vibration of conductors and transmission tower should not be neglected.更多还原