Wind-Induced Response and Equivalent Static Wind Load of Transmission Lines Considering the Location Updating Effect

Abstract

Transmission lines will significantly deviate from the initial location under wind loadings due to the strong geometric nonlinearity of the conductor. Ignoring the location updating (LU) effect can greatly reduce the modeling accuracy of wind load. This paper proposes a framework to quantify the influence of the LU effect on wind-induced responses and equivalent static wind load (ESWL), and emphasizes the need to consider this effect through systematic discussions. To facilitate the actual engineering design, a simplified method based on the rigid pendulum assumption is developed to modify the ESWL. The results indicate that the mean wind load is amplified by the LU effect, and the amplification effect becomes increasingly noteworthy with increasing basic wind speed. Conversely, the gust response factor is hardly affected. After considering the LU effect, the average component of various responses increases to varying degrees, particularly the horizontal tension and lateral reaction. The simplified method has a relative error of only -0.45% under the design condition and exhibits great robustness to the height difference. Compared with the methods recommended by various codes, the proposed method provides a more accurate estimation of ESWL, which helps to balance the contradiction between structural safety and construction cost.