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.
Highlights
The transmission tower-line system, consisting of lattice support towers and conductor cables, is an important lifeline project as a high-voltage electric power carrier and play, an important role in the infrastructure system in many countries throughout the world [1, 2]
Because the progressive collapse of structures is initiated by the loss of one or more load-carrying members, the most important is that the loss or failure element would be simulated by the technique of element birth and death in ABAQUS
Accurate structural analysis of power transmission structures is complicated and close to the real application, which meant that the current computer simulation technique is effective for predicting and evaluating the ultimate structural progressive collapse behavior
Summary
The transmission tower-line system, consisting of lattice support towers and conductor cables, is an important lifeline project as a high-voltage electric power carrier and play, an important role in the infrastructure system in many countries throughout the world [1, 2]. Along with rapid development of the power industry and national economy, designing and constructing much taller and longer span high-voltage transmission towers is obvious current trend, which has proposed new requirements for structural engineering This structural system has some particular characteristics, such as high-rise tower, large-span and crossing hypsography, the flexibility of entire structure increasing nonlinearly as its height, and power transmission tower coupling with transmission lines with different amplitude of dynamic properties [3]. To simulate and analyze the behaviour of transmission tower-line structures during a wind-induced progressive collapse process is a complex operation with strong nonlinearity. A comprehensive study was presented in this paper to assess and understand the progressive collapse performance of transmission line structures under wind loads. As a vital component and management in transmission tower networks, transmission tower-line system
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