输电杆塔载荷安全强度设计仿真研究

Transmission Tower Load Security Strength Design Simulation Research

在输电杆塔负荷强度优化设计中,为获得输电杆塔载荷安全强度,应用有限元软件建立架空输电杆塔参数化模型,求解获得各节点应力,并综合采用强度储备理论和1-9标度法对杆塔进行安全强度分析。建模过程中充分考虑了各种载荷的影响并对载荷计算中的难点进行分析,包括线路舞动、导地线初始构形、杆塔自重、杆塔覆冰和风载。为进一步验证有限元模型的准确性,将仿真结果与理论计算对比,最大误差为17.8%,产生误差的原因是理论计算采用的力学模型将杆塔简化为对称的平面桁架结构,与杆塔实际结构不符。研究结果表明:在有限元模型的基础上进行安全强度分析是可行的,可为载荷安全强度设计提供科学依据。

In order to obtain the transmission tower load security strength, the parameterized model of the overhead transmission tower was set up with finite element software. The stress of node was solved, and the strength reduction theory and 1-9 scale method were carried out on the security strength analysis of the tower. The influences of all kinds of loads were considered and the difficulties in load calculation were analyzed, including line galloping, initial configuration of line, weight, ice and wind load. To further verify the accuracy of the finite element model, compared the simulation result with the theoretical calculation, the maximum error is 17.8%. The reason is that the mechanical model used in theoretical calculation was simplified as a symmetry plane truss structure, which is not tally with the actual structure tower. The result shows that the security strength analysis is feasible on the basis of the finite element model.