两相邻输电塔的同步环境脉动实测试验研究

基于随机振动及系统识别理论，对两相邻自立式直线输电塔进行同步环境脉动实测，识别两相邻输电塔耦合导地线的动力特性及绝缘子在输电塔的横向和纵向的振动频率。试验结果表明：在塔两侧导地线的初始张拉力一致的情况下，相邻直线输电塔的动力特性较为接近，与输电塔档距无关；同时分析得出输电塔的阻尼比均大于《高耸结构设计规范》（GB50135－2006）规定的阻尼比0.01。由于导线的影响，测试出绝缘子在塔-线体系横向振动频率大于输电塔的振动频率，而在纵向小于输电塔的振动频率，频率的差异对输电塔-线体系在风荷载作用下的振动情况不利。

Synchronous test study of two adjacent transmission tower undergoing ambient excitation

The ambient vibration tests of two adjacent transmission towers were carried out based on the theory of random vibration and system identification. The vibration mode of the two adjacent towers coupled with the cable effects and the transverse & vertical vibration frequencies of the insulators were identified. The experimental results indicate: two adjacent tangant towers have the same dynamic properties basically. The span of transmission tower has little effect on its dynamic feature under the same initial stress. Damping ratios of the two transmission towers are more than 0.01 which is recommended by the code for design of high-rise structures. It is further indicated that the natural frequencies of the insulators are different to those of towers in both longitudinal and lateral directions. This is not beneficial to the wind-excited dynamic responses of transmission tower-line system.