【作者】 张鑫；

【导师】 王辉； 杨雪锋；

【作者基本信息】 合肥工业大学 ， 建筑与土木工程（专业学位）， 2020， 硕士

【摘要】 输电塔-线体系是输电线路的主干线,是重要的生命线工程。由于输电塔线体系自振频率较低,与风的卓越频率十分接近,在极端复杂的气象条件及某些特殊的工作状态下,杆塔可能会发生折断甚至连续倒塌的现象。由于塔线耦合的复杂机理,目前对其进行理论分析还存在诸多困难。最有效的方法是通过数值模拟方法进行分析,获取塔线结构体系的风致动力响应特性,为输电塔线体系的抗风设计提供有效的理论指导和直接的设计依据,对确保输电线设备安全运行、降低人民财产损失和保障人民生活秩序有着重要意义。本文以某耐张塔线路为研究对象,基于风工程基本理论,建立耐张塔线体系分析模型,分别对单塔和塔线体系进行动力特性分析,掌握其结构自身的动力特性,并以此为基础,通过模拟常态风荷载、风雨联合激励荷载以及移动下击暴流风荷载的动态作用,对耐张塔线体系在多类气候作用下的风致动力响应特性开展研究。通过研究发现,输电导线对体系的影响具有方向性,塔线平面外,导线对塔体刚度贡献不大,由于整体质量增加,使得该方向塔体刚度偏小,塔线耦合效应在塔线平面外方向更为突出,在来流风作用下,还未达到塔体的振动频率时,便发生了多次塔线平面外方向的共振响应。考虑降雨时,大雨强下风雨联合激励对塔顶位移影响明显,极值条件下增大量甚至达到20%左右,在相关电力结构设计中应予以考虑。在移动下击暴流作用下,输电塔线塔顶位移和加速度功率谱值远大于常态风,且谱峰对应频率发生了前移现象,下击暴流对输电塔线体系动力响应的影响相较于常态风更为显著。更多还原

【Abstract】 The transmission tower-line system is the backbone of the transmission line and an important lifeline project.Due to the low natural frequency of the transmission tower line system,it is very close to the excellent frequency of the wind.Under extremely complicated weather conditions and certain special working conditions,the tower may break or even continuously collapse.Due to the complex mechanism of tower-line coupling,there are still many difficulties in theoretical analysis.The most effective method is to analyze through numerical simulation methods to obtain the wind-induced dynamic response characteristics of the tower line structure system,provide effective theoretical guidance and direct design basis for the wind resistance design of the transmission tower line system,and ensure the safe operation of the transmission line equipment.It is of great significance to reduce the loss of people’s property and protect the order of people’s lives.This article takes a tension tower line as the research object,based on the basic theory of wind engineering,establishes a tension tower line system analysis model,analyzes the dynamic characteristics of single tower and tower line systems,and understands the dynamic characteristics of the structure itself.On this basis,the wind-induced dynamic response characteristics of the tension tower line system under various kinds of climate are studied by simulating the dynamic effects of normal wind load,combined wind and rain excitation load and moving downburst wind load.Through research,it is found that the influence of the transmission line on the system is directional.Outside the plane of the tower line,the wire does not contribute much to the rigidity of the tower.Due to the increase in the overall mass,the rigidity of the tower in this direction is small,and the coupling effect of the tower line is on the tower line.The out-of-plane direction is more prominent,and under the action of incoming wind,the resonance response of the tower line out-of-plane direction has occurred many times before reaching the vibration frequency of the tower body.When considering rainfall,the combined excitation of wind and rain under heavy rain and strong weather has a significant effect on the displacement of the top of the tower,and the increase amount even reaches about 20% under extreme conditions.It should be considered in the relevant power design.The peak displacement and acceleration power spectrum values are much greater than the normal wind,and the frequency corresponding to the spectrum peak has moved forward.The impact of the downburst on the dynamic response of the transmission tower line system is more significant than that of the normal wind.更多还原