为研究不等边角钢作为特高压输电塔交叉斜材的承载性能，选用了我国特高压 输电塔结构中典型的节间形式，制作了交叉斜材采用不等边角钢的足尺节间试件，进行了 节间不同工况下的静力加载试验，研究了不等边角钢交叉斜材的应变发展、变形特征、破 坏模式及极限承载力;然后，建立了节间的非线性有限元模型，并进行了试验验证和参数 分析． 试验结果表明，不同工况加载过程中，不等边角钢交叉斜材的稳定承载性能良好，极 限荷载作用下，不等边角钢交叉斜材的受力方式决定其最终的破坏模式为面外屈曲或面 外和面内共同屈曲;有限元模型参数分析表明，随着交叉斜材内力比值的降低、材料强度 等级的提高以及斜材相交点位置的提高，不等边角钢交叉斜材的承载力均有所提高，交叉 斜材的受力方式对其承载力提高的效果有显著影响． 最后，基于能量法及有限单元法，提 出了不等边角钢交叉斜材承载力计算的理论方法，经验证，理论方法的计算结果与有限元 分析结果、试验结果吻合较好．

The mechanical properties of unequal angle cross bracing of ultra-high voltage (UHV) transmission tower were studied． Two full-scale internodes adopting unequal angle cross bracing，used commonly in UHV trans- mission tower in China，were made and carried on the static test under different working conditions． The strain de- velopment，the characteristics of deformation，the failure mode and the ultimate bearing capacity of the unequal angle cross bracing were mainly studied; then the nonlinear finite element analytical (FEA) model of internodes were established and verified by test． The parameters of FEA model of internodes were analyzed． The test results show that the bearing capacity of unequal angle cross bracing is good in different working conditions loading，when the load reaches the limit value，the failure mode of the unequal angle cross bracing was determined by loading mode to be out-of-plane buckling or out-of-plane and in-plane buckling． The parameter analysis shows that the bearing capacity of cross bracing is improved with the decrease of the internal force ratio，the increase of material strength and the increase of the intersection position． The improvement of bearing capacity of cross bracing is sig- nificantly affected by loading mode． Finally，based on the energy method and the finite element method，the theo- retical method of bearing capacity of unequal angle cross bracing were provided． It turns out that the theoretical re- sults are in good agreement with the results of test and FEA．