输电铁塔主材内力与基础水平位移关系式的研究
On relationship between internal force of the main materials of transmission towers and horizontal displacement of foundations
过浩川 1吴松 2吴昊 3李强 2黄模佳 1樊晨旭 1杨垂玮3
作者信息
- 1. 南昌大学工程建设学院,江西 南昌 330031
- 2. 国网安徽省电力有限公司,安徽 合肥 230061
- 3. 中国能源建设集团安徽省电力设计院有限公司,安徽合肥 230601
- 折叠
摘要
铁塔基础在遭遇地质灾害的情况下会发生垂直和水平位移;相比于水平位移,人们多关注基础垂直位移对塔构件内力的影响,但水平位移对杆件内力影响同样不可忽略,研究输电铁塔基础水平位移与铁塔安全性的关系具有重要意义.为了推导基础水平位移与铁塔主材内力的解析式,运用梁和杆的刚度等效方法和能量法,给出了单腿水平位移作用下四个塔腿承受弯矩的比例关系,推导出主材在第一横格面处的最大弯矩,通过简化模型推导出单腿基础水平位移作用下铁塔各塔腿主材最大轴力表达式,并通过有限元计算对最大轴力表达式进行修正.输电铁塔受上部荷载在主材中主要产生轴向拉(压)应力,而基础水平位移主要产生弯矩应力.本文给出的主材内力与塔腿位移表达式可作为输电线路塔腿基础发生水平位移后铁塔的安全评估的依据.
Abstract
The foundation of transmission iron tower may produce vertical and horizontal displacement during geological dis-asters.People have paid more attention to the influence of vertical displacement of tower foundation on the internal forces of components in tower,the horizontal displacement also has a significant impact on internal forces of tower components.Hence,it's important to study the relationship between horizontal displacement of tower foundations and tower safety.In order to de-rive the equation for the relationship between the horizontal displacement and internal force of tower main material by energy method and stiffness equivalence method of beam and rod.The proportional relation of bending moments sustained by four tow-er legs under the action of horizontal displacement of single leg is given.The maximum bending moment of main material at the first cross-grid surface is deduced.The maximum axial force expression of each leg of tower main material under the action of horizontal displacement of single leg is given by simplified model.The expression of the maximum axial force is modified through FEM.The upper external loads of transmission tower generated axial forces in main materials,but the horizontal dis-placement of the foundation mainly generated bending moments of main materials.In this paper,the expression of the internal forces of main materials and displacement of tower leg can be used as the basis for the safety assessment of tower after the hori-zontal displacement of transmission tower.
关键词
输电铁塔/基础水平位移/内力计算式/有限元分析Key words
transmission tower/horizontal displacement of tower foundation/internal forces/finite element modification引用本文复制引用
基金项目
国家自然科学基金资助项目(11572147)
出版年
2024
NETL
NSTL
万方数据