Q460特高压双回路钢管塔真型试验分析

Full-scale Test Analysis for Q460 Tubular Steel Tower Applied in UHV AC Double-circuit Transmission Line

SZ2U钢管塔为使用Q460高强度钢材的1000kV同塔双回路直线型钢管真型塔,塔全高103.6m,单基塔质量132t。依据标准DL/T899—2004《架空线路杆塔结构荷载试验》,在正常大风、锚线、断线等8个试验工况下对其进行试验,试验结果表明:SZ2U钢管塔的位移测试结果满足变形要求,应变测试结果没有超过构件承载力,说明试验塔强度和刚度均符合设计要求,并有一定的安全储备;同时节点构造和法兰连接安全可靠。特高压输电钢管塔设计中采用Q460高强度钢材,既能满足设计要求,又能减轻塔重,建议在实际工程中试点应用。试验同时对输电钢管塔主材的次弯矩进行了真型塔测量,通过实际测量值与理论分析对比,得到输电钢管塔变坡处以下主材的次弯矩效应比较显著,建议工程中建立有限元模型进行强度校核,必要时采用考虑节点刚度的有限元模型。

The SZ2U tubular steel tower,103.6 m in height and 132 tons in weight,and made of the Q460 high-strength steel,is a full-scale testing tower applied in 1 000 kV UHV AC double-circuit transmission line project.The test was carried out according to the standard DL/T 899—2004 ＂Loading Tests on Tower and Pole Structures of Overhead Line＂ under 8 different operation conditions,including wind,anchor-wire,broken wire,and so on.The testing results show that the actual displacement and stress of the tower SZ2U are within the limits of deformation and member＇s bearing capacity respectively;the strength and stiffness of the testing tower meet the design requirement with a certain safety margin,and the joint construction and flange connection are reliable.Application of the Q460 high-strength steel in UHV transmission tower design can not only meet the requirement of design code,but also reduces the weight of the transmission towers.It is therefore recommended to use it through pilot projects.In addition,the secondary moment of the tower＇s primary members is measured during the full-scale test.A comparison of the measured result and the theoretical values indicates that the effect of secondary moment of the primary members under the varying slope is prominent,and it is therefore recommended to establish the finite element model,the finite element model of node rigidity if necessity,to check the strength.