特高压单回路酒杯型输电塔线耦联体系振动台试验研究
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摘要
特高压输电工程在我国进入大量建设阶段后,尚未经历严酷的自然灾害考验。为了分析强震作用下特高压塔线耦联体系动力反应特点以及导、地线对单塔结构动力反应的影响,该文针对特高压格构式输电塔线体系进行了振动台试验研究,旨在为特高压塔线体系的合理抗震设计提供基础。试验以1000kV特高压交流单回路输电线路工程为背景,设计制作了三塔两线体系模型并模拟了体系的边界条件,选取四种不同类型的地震激励,针对塔线体系及单塔进行了八度罕遇下的动力测试。研究结果表明:挂线后该型塔垂直线路方向自振频率下降较为明显且塔线体系动力反应受地震激励类型影响较大;与单塔相比,挂线后该型塔垂直线路方向的能量分布较为显著的向低频区转移;地震作用下,挂线形式下的该塔各项动力反应比单塔结构降低了4%~45%,导线、地线的存在提高了该塔的抗震能力。杆塔动力分析时应考虑导线、地线的影响,否则将会过高的估计塔架结构的地震反应。
Ultra high voltage(UHV) transmission structures have not been subjected to severe natural disasters since their large scale construction in China.In order to analyze the seismic response characteristics of a transmission tower-line coupling system and the dynamic influence on the tower from ground wire and conductors under earthquakes,a shaking table test on a 1000kV UHV transmission tower-line system aiming at proposing a rational suggestion for the aseismic design of a high-voltage tower-line system were carried out.Taking 1000 kV single circuit transmission lines of an ultra high voltage transmission structure as the prototype,a three-tower two-span model was made and the boundary conditions were also simulated.Seismic test were conducted under 8 degree seldom-occurred earthquakes and four types of earthquake ground motions were selected as the seismic excitations.By test results,it was found that the conductors have a greater impact on the natural vibration frequencies of a transmission tower in the cross-line direction compared with the case for the along-line direction.For the tower with conductors,the vibration energy on the tower top in the cross-line direction exhibited the shifting to a low-frequency,comparing with the corresponding standalone tower.In general,the values of the dynamic response for the transmission tower with conductors decreased by 4%-45%,compared with the standalone one.It shows that the existence of conductors improves the aseismic capacity of the transmission tower.Thusly,it is necessary to consider the influence of conductors in the dynamic analysis for the transmission tower to avoid the overestimation of seismic responses.
引文
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