轻中冰区悬垂塔型式对铁塔一阶振型影响研究  

Study on the influence of structural type of suspension tower on the first-order vibration mode of tower in light and medium ice area

作　　者：李杰 宋悦 何松洋 蒲劭彤 李鑫 Li Jie;Song Yue;He Songyang;Pu Shaotong;Li Xin(Shaanxi Power Transmission and Transformation Engineering Co.,Ltd.,Xi’an Shaanxi 710000,China;China Electric Power Engineering Consulting Group Southwest Electric Power Design Institute Co.,Ltd.,Chengdu Sichuan 610000,China)

机构地区：[1]陕西送变电工程有限公司,陕西西安710000 [2]中国电力工程顾问集团西南电力设计院有限公司,四川成都610000

出　　处：《山西建筑》2025年第3期57-60,共4页Shanxi Architecture

摘　　要：轻中冰区悬垂塔的受力主要受风荷载控制,而风致效应主要受铁塔一阶振型的方向影响,一阶振型为横担方向横向振动时,符合规范等效静力荷载的计算假定,计算得到的风荷载效应最不利,反之,计算得到的风致效应并不是最不利的,可能使得设计偏于不安全,因此研究输电塔的自振特性对其受力显得十分重要。基于结构力学基本原理和数值模拟研究了悬垂塔不同结构型式下的振型特性,研究表明:悬垂塔呈鼓型布置时,由于横担较短,横担的质量占比较小,扭转效应较弱,一阶振型表现为横向振动;悬垂塔羊角型(直流双极塔)布置时,由于横担较长,横担的质量占比较大,扭转效应明显,一阶振型表现为扭转;悬垂塔为酒杯塔和猫头塔时,一阶振型主要受塔窗轮廓材的相对规格比控制;并结合参数分析结论提出了不同布置型式下保证悬垂塔一阶横向振动的措施,研究结论对工程实践具有一定的指导意义。The force of the suspended tower in the light and medium ice area is mainly controlled by the wind load,and the wind-induced effect is mainly affected by the direction of the first-order vibration mode of the tower.When the first-or-der vibration mode is transverse vibration in the direction of the cross arm,it conforms to the calculation assumption of the standard equivalent static load,and the calculated wind load effect is the most unfavorable.On the contrary,the calculat-ed wind-induced effect is not the most unfavorable,which may make the design unsafe.Therefore,it is very important to study the natural vibration characteristics of the transmission tower for its force.Based on the basic principle of structural mechanics and numerical simulation,the vibration mode characteristics of different structural types of suspension tower are studied.The research shows that when the suspension tower is drum-shaped,due to the short cross-arm,the mass of the cross-arm is relatively small,the torsion effect is weak,and the first-order vibration mode is transverse vibration.When the overhanging tower is arranged in the horn type(DC bipolar tower),due to the long cross arm,the mass of the cross arm is relatively large,the torsion effect is obvious,and the first-order vibration mode is torsion.When the suspended tower is a wine cup tower and a cat's head tower,the first-order vibration mode is mainly controlled by the relative speci-fication ratio of the tower window profile;combined with the conclusion of parameter analysis,the measures to ensure the first-order transverse vibration of suspended tower under different layout types are put forward.The research conclusion has certain guiding significance for engineering practice.

关 键 词：轻中冰区 悬垂塔 结构型式 一阶振型 数值模拟 

分 类 号：TU311.3[建筑科学—结构工程]