格构式输电铁塔组成杆件对极限承载力影响的研究

对输电铁塔中数量较多、构造复杂的交叉斜材体系利用大型通用有限元程序ANSYS建立了有限元模型，并对其极限承载能力以及承载力的影响因素进行了全面的非线性分析。结果表明主材、斜材和附材对交叉斜材体系极限承载能力的影响程度各不相同，其中斜材影响最大。根据分析结果，针对沈阳地区某输电塔结构提出了加固改造方案，并给出了加固后输电铁塔抵抗静力推覆作用和抗震能力的提高程度。

Influence of components on ultimate strength in lattice transmission tower

The X-braced panels in the transmission tower are modeled using the general-purpose finite element program ANSYS in this paper. Then the ultimate strength of the X-braced panel system and the influences of the main leg, and the bracing member, the secondary bracing member on the ultimate strength are analyzed by considering its nonlinear actions. The results show that the influence of the bracing member is more than the main leg and the secondary bracing member. Then a strengthening method is presented based on the finite element analysis of the X-braced panel system. And a transmission tower located in Shenyang is analyzed by this strengthening method. The transverse resistance and the seismic strength of the transmission tower are increased comparing the ultimate strengths of the unstrengthened and strengthened structure.