摘要
大跨度高压输电线路不可避免地穿越气候多变且地质环境复杂的高山大岭,传统的巡线模式不能及时反馈信息而降低线路灾情的评估精度和重建进度,结合输电线路实时运行状态的承载能力评估是电网安全运行的技术保证。以500 k V张恩输电塔线的144号杆塔为研究对象,采用梁单元、悬链线索单元模拟输电塔、导线和绝缘子,建立塔线耦合体系的空间有限元模型。以地质灾害引起的基础沉降及风荷载为影响因子,分析塔腿沉降与风荷载组合的塔线体系力学响应和安全评价,其结果表明塔腿单一塔腿沉降对结构应力、变形的影响较小,多塔腿沉降导致杆塔材料出现局部屈服,且组合风荷载后增大了杆塔的破坏几率,结构安全性降低。因此,塔线体系的力学响应分析可作为精确评估输电线路承载能力的重要手段,为山地环境中的输电线路健康状态评估提供了重要的科学依据。
The long-span high voltage transmission( hvt) lines always locate in the field with variable climate and high mountains,the traditional line inspection cannot feed back the operation information so as to decrease the evaluation accuracy of the line danger and reconstruction progress,so determination of the bearing capacity is significant for the safe operation of the electric grid. Taking the tower 144 of a 500 kV hv transimission line named Zhang-en as a case study,the beam element and catenary cable element were used to model the transmission tower,conductors and insulators,and a 3-D finite element model( FEM) of the tower-line system was established. And then,considering the surface deformation induced by the geological disaster and the wind as the main factors,the mechanical response and safety assessment of the structure under different combined loading conditions were treated,the results indicated that the settlement of a single foundation had minor influence on the strcutre deformation and stress. However, the settlement for more than one foundation resulted in more members yielding, especially combination with the wind increased the failure probability and reduced the structure safety. Therefore, the mechanical analysis of the tower-line system may be an important way to evaluate the healthy condition of the hv tower-line system,and provide a scientific base to introduce an effective online monitoring system of the hvt lines in the mountain area.
出处
《地下空间与工程学报》
CSCD
北大核心
2014年第S2期1951-1957,共7页
Chinese Journal of Underground Space and Engineering
基金
武汉大学水资源与水电工程科学国家重点实验室开放基金(2012B100)
中央高校基本科研业务费(106112013CDJZR200004
106112014CDJZR200014)
关键词
山地环境
高压输电线路
塔线耦合体系
塔基沉降
力学响应
安全性
Mountain area
High voltage transimission(hvt) line,Tower-line system,Tower settlement,Mechanical response,Safety
