【摘要】 针对在役山区老旧输电塔的结构性能提升需求，开展了预应力拉索加固技术研究。重点讨论了拉索连接位置、倾角和初应力对输电塔线体系动力响应的影响，并通过回归分析确定了预应力拉索最佳加固方案。深入研究了最佳加固方案下加固前后的输电塔在输电线不均匀脱冰工况下各关键部位的动力响应，并基于响应面法对加固前后结构可靠度进行了研究。结果表明，预应力加固法可大幅降低输电塔的节点位移和杆材峰值应力，有效提升了结构的可靠度，降低结构的失效概率。更多还原

【Abstract】 To address the need for improving the structural performance of existing old transmission towers in mountainous areas, the reinforcement technology using prestressed cables was investigated.The research focused on analyzing the influence of cable connection position, inclination angle, and initial stress on the dynamic response of the transmission tower system.The optimal reinforcement scheme was determined through regression analysis.Furthermore, the dynamic responses of key components under uneven de-icing conditions were compared before and after reinforcement using the optimal scheme.Structural reliability was evaluated via the response surface method.The results demonstrate that the prestressed reinforcement method significantly reduces nodal displacements and peak stresses in the transmission tower, enhances structural reliability, and lowers the probability of structural failure.更多还原