中文摘要：

以某典型输电铁塔为背景，采用数值分析方法，进行了梁桁混合模型与剐聚模型的建楔，井对计异结果进行对比分析，得出两种模型对于输电塔杆件内力和变形的影响规律。研究表明，刚架模型的最大综合位移与梁桁模型相差2％以内，这说明主材和斜材对于塔架整体刚度贡献较大，辅助材对整体剐度贡献较少。同一工况下梁桁混合模型与刚架模型的轴力、应力结果相应之比集中在1．002～1.020区间内，可见粱桁混合模型受力结果稍微大于刚架模型，混合模型结构设计偏于安全。该研究分析为输电铁塔设计模型的计算与选择提供了依据。

英文摘要：

A typical power transmission tower was numerically analyzed. The rigid frame model and mixed model with beam and truss were established. And the influence of two models on the internal force and deformation is obtained from the computing results. The results indicate that the difference of maximal displacement between mixed model and rigid frame model is within 2%. In other words, the stiffness effect of main bars and diagonal bars is greater than that of secondary bars. The research also indicates that the ratio of the internal forces between mixed model and rigid frame model is greater than 1, ranging from 1. 002 to 1. 020. Therefore, in the same load case, the internal forces of mixed model are larger than that of rigid frame model. Hence, it provides the basis for the calculation and selection of design model of the power transmission tower.