四種正多邊形截面輸電鐵塔結(jié)構(gòu)分析
楊垂瑋，鄭向鋒，張樹林
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（中國能源建設(shè)集團安徽省電力設(shè)計院，合肥 230601）[摘要] 架空輸電鐵塔作為電力輸送的主要結(jié)構(gòu)，其安全可靠性直接關(guān)系到整個電力系統(tǒng)的安全與經(jīng)濟運行。輸電鐵塔的結(jié)構(gòu)形式繁多，一般隨線路沿線地形、電壓等級和施工條件等各種因素變化而不同。但是目前針對鐵塔橫截面形式的設(shè)計并不多見。以外接圓半徑相等為切入點，建立了截面形式為正三角形、正四邊形、正五邊形和正六邊形的4種鐵塔基本單元格，分別給出單元格在相同截面扭矩、彎矩和剪力荷載作用下鐵塔桿件的軸力理論解及其力學(xué)規(guī)律，為合理選擇鐵塔截面形式并改善桿件受力狀態(tài)提供理論依據(jù)。并給出4種正多邊形鐵塔任意截面桿件內(nèi)力計算公式，用大型有限元分析軟件MSC.PARTRAN和MSC.NASTRAN驗證了公式的正確性。中圖分類號：TM753 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2013)S2-0478-06作者簡介：楊垂瑋，碩士，E-mail: yangchuiwei@sina.com。Analysis on the structure of four power transmission towers with regular polygon cross sectionYang Chuiwei, Zheng Xiangfeng, Zhang Shulin(Anhui Electric Power Design Institute, China Energy Engineering Group Co.,Ltd., Hefei 230601, China)Abstract：As an important part of power transmission system, the safety and reliability of transmission tower are directly related to the safety and economic benefit of entire power system. The structures of transmission towers change with various factors such as line voltage levels, along line topographies and construction conditions. But currently, the optimization of tower cross-section is rare. In order to choose a reasonable form of tower cross-section and to improve stress states of members, the paper start with the equality of circumcircle radius and build four basic units of electric-towers which the cross-sections are regular polygons (including triangles, quadrilaterals, pentagons, hexagons). Then some conclusions were draw, including. Under the condition of the same cross-section torque, same bending moment and same shear force, Under the condition of same cross-section torque, same bending moment and same shear force, get the maximum axial forces of the members. Given the formulas of the members' axial forces of the regular polygons towers, and prove the formulas of the correctness.Keywords: regular polygon; power transmission tower; sectional design; mechanical property
