1000kV交流特高压钢管塔梁杆有限元分析研究  

Study on Beam-rod Finite Element Model of 1000 kV AC UHV Steel Pipe Tower

作　　者：周建军 蒋锐 王梦杰 ZHOU Jianjun;JIANG Rui;WANG Mengjie(Southwest Electric Power Design Institute Co.,Ltd.of China Power Engineering Consulting Group,Chengdu,Sichuan 610000,China)

机构地区：[1]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：《山西电力》2022年第1期18-22,共5页Shanxi Electric Power

摘　　要：1000 kV交流特高压同塔双回路钢管塔具有负荷大、结构高耸、柔度大等特点,由于焊接的连续性、节点板和钢管刚性连接等原因的影响,结构在节点处易产生次弯矩和次应力,从而造成构件及节点局部应力不均。按传统桁架结构杆单元线弹性理论进行分析和设计,杆塔实际受力状态与计算结果存在差异,造成选材不够准确。为解决上述问题,采用梁杆单元模型进行分析计算,并与杆单元模型结果进行对比。计算发现,梁杆有限元模型和杆单元模型计算所得钢管塔主材的轴力大小相当,下横担以下的主材弯矩较大,特别是塔腿、靠近塔腿的主材、变坡处和各层横担主材节点处。主材构件两端的强度应力最大,而稳定应力则主要出现在中部,采用梁杆单元模型进行精细化设计,不仅具有一定的经济性,同时各构件安全冗余度趋同,在塔材耗量相当的情况下,一定程度地提高了杆塔的承载能力。The 1000 kV AC UHV one-tower double-circuit steel pipe tower has the characteristics of large load,high structure,high flexibility and so on.Besides,due to the influence of continuity of welding,rigid connection of gusset plates and steel pipes and so on,the structure is prone to the production of secondary bending moment and secondary stress at the joints,resulting in uneven local stress in components and nodes.An analysis and design are carried out according to the linear elastic theory of rod elements in traditional truss structures,and the calculated result is different from the actual stress state of the tower,which makes the material selection inaccurate.In order to solve this problem,beam-rod element model is adopted for analysis and calculation,and the results are compared with that of the rod element model.After calculation,it is found that the axial forces of the main material of the steel pipe tower calculated by the beam-rod finite element model and the rod element model are equivalent,and the bending moment of the main material below the lower crossarm is relatively large,especially at the tower legs,the main materials close to the tower legs,the place where the slope changes and the main material nodes of each layer of crossarms.The strength stress at both ends of the main material component is the largest,while the stable stress mainly appears in the middle.The beam-rod element model is finely designed,which not only has certain economic efficiency,but also the safety redundancy degree of each component is similar,and the load-bearing capacity of the tower is improved to a certain extent under the condition of the same consumption of tower materials.

关 键 词：特高压线路 钢管塔 梁杆有限元模型 杆单元模型 

分 类 号：TM753[电气工程—电力系统及自动化]