The Numerical Analysis of Transmission Tower-Line System Wind-Induced Collapsed Performance

Abstract

The numerical simulation of transmission tower-line systems' progressive collapse performance is considered as a major research hotspot and significant project, due to the increasing number of wind-induced collapse accidents recently. In this study, the finite element models for single tower and transmission tower-line system were established to simulate wind-induced progressive collapse by birth-to-death element technique in ABAQUS/Explicit. The wind field, based on the Kaimal fluctuating wind power spectrum and harmonic superposition method, was constructed by MATLAB commercial software. The current research focuses on the dynamic behaviour and the mechanism of a typical transmission tower-line system progressive collapse under wind action with clear step-by-step description. The numerical simulation results demonstrated that transmission tower-line system collapse mechanism depended on the number, position and last deformation of damage elements. Since the gallop effect of conductor and ground lines were ignored in the single tower model, the transmission tower-line system model, which has higher computational precision than the single tower model, is relatively accurate and recommended strongly in the design.

Climate change and extreme wind effects on transmission towers

“…• Geometric nonlinearity that accounts for the effect of changes in geometry and accumulated strain on the structural stiffness of elements (Hrinda, 2006) • Material nonlinearity that accounts for permanent (or plastic) deformation in materials subjected to stresses exceeding their yield point (Souza Neto, et al, 2008) To determine the dynamic response of the towers accurately, wind-induced response of the transmission lines should also be included in the model (Zhang, et al, 2013;Battista, et al, 2003). Although a model with three towers and four spans of transmission lines is the optimal configuration for analysis (Zhang, et al, 2013), one tower and two spans of transmission lines can produce reasonably accurate results with enhanced computational efficiency (Li, et al, 2012).…”

“…Although a model with three towers and four spans of transmission lines is the optimal configuration for analysis (Zhang, et al, 2013), one tower and two spans of transmission lines can produce reasonably accurate results with enhanced computational efficiency (Li, et al, 2012).…”

Structural Analysis of Lattice Steel Transmission Towers: A Review

“…secondary bracings) are considered as truss elements due to their single bolt connections at the end, low flexure stiffness and low moments transferring to other structural members [31,36,37]. Compared with the complexity of the truss modelling method, the truss-beam method simplifies the modelling process on which current numerical research on behaviours of transmission tower structures are based [24,38,39]. Its accuracy has also been proven by comparing with the results from experimental testing [40][41][42][43].…”

“…Very recently, a further study on failure behaviours has been undertaken on a numerical model of a steel lattice transmission line system [38]. These authors modelled a line system by connecting tower models with cable elements and tested them in various wind conditions.…”

Full-Scale Reconstruction for Transmission Line Galloping Curves Based on Attitudes Sensors

“…Caused by strong winds or nonuniform icing, conductor galloping is a kind of self-excited vibration with low frequency (0Hz-3Hz) and high amplitude (a few meters to tens of meters), and that can cause various types of damage, such as conductor fracture, tower collapse, and large-scale grid paralysis. Hence, galloping prevention is imperative [1][2][3].…”