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.

The application of digital management of power transmission project based on BIM technology is introduced in this paper. In recent years, the vigorous development of China's power grid, especially the comprehensive construction of UHV power transmission and transformation projects, has provided strong support for China's power grid construction. With engineering and technical personnel's gradual dependence on digital information, a 3-D digital management system based on BIM technology has been progressively implemented. It has become an inevitable trend to establish a 3-D digital and integrated platform based on BIM technology to assist owners and operators to jointly manage power transmission and transformation projects. With the wide application of power transmission and transformation entity structure BIM models in the design, construction, procurement, management and operation phases, the advantages of BIM technology in visualization, coordination, simulation and integration continue to emerge in its effective circumventing the risks and hidden dangers of power projects. Thus, BIM technology has gradually become a new channel for enterprises to earn profits and win greater economic benefits and market competitiveness.

This paper highlighted a new improved ant colony optimization algorithm was realized to deal with structures optimization problems efficiently, with several special improvements. The new algorithm procedure was written by the MATLAB language. The numerical simulation results demonstrated that this new methodology revealed more obvious advantage at truss structural optimization problems in discrete system. For the civil engineering designer, this new method is very simple and practical, and much more suitable.

In this study, three-dimensional finite element models of transmission tower-line systems were established, analyzed and simulated wind-induced progressive collapse by birth-to-death element technique in ABAQUS/Explicit. This research provided clear step-by-step descriptions of various procedures for progressive collapse analysis of different transmission tower-line systems by wind load. The numerical simulation results demonstrated that wind-induced collapsed performance of transmission tower-line system could be simulated clearly. For the Claw-type and Stem-type double circuit transmission tower-line systems, the progressive collapse speed and path were different under the same wind loading and related to the structural topology form and material characteristics closely. Therefore, the numerical simulation of progressive collapse process was considered as a significant and necessary project.