| As the carrier of high voltage electric power, the transmission tower-line system is an important lifeline project. With the living standard improvement and national economic development, there is no denying that high voltage and large span transmission towers construction is current trend, especially ultra-high voltage transmission line engineering. It is a research hotspot and difficulty for engineers to build and develop a safe, reliable, economic and reasonable. Because the transmission tower structural optimization design methods and theories are relatively behind at this stage, based on ant colony optimization algorithm and finite analysis method, this research presents a general structure optimization design and analysis test methods. The contents are listed as follow:(1).Because there are two type of variables in structural topology and shape optimization design, and a better optimal effect for controlling is missing, this paper presents a truss structure multi-type variables optimization method based on ant colony optimization. Base on structural topological quantity and general topology, the structural topology optimization problem is transformed into a pair of TSP, and can be solved by ACO algorithm. On the basis of constructing weighting function, the two-level optimization method is implemented to shape optimization design, by taking full advantage of the different kinds of ACO algorithms.(2).Aiming at disadvantages that the multi-type variable optimization method has low computational efficiency in optimizing a large and complex structure or structural layout optimization problems, the truss structure discrete variable optimization method based ACO is proposed, including sizing, topology, shape and layout optimum arithmetic. It can be seen from these classical instances that the proposed optimal algorithms have a good performance in program design and method commonality, which also has a good application prospect in civil engineering.(3).Base on single-objective ant colony optimization algorithm performance in discrete system, a new improved multi-objective ant colony optimization discrete variable algorithm is proposed in this study. The improved P-ACO algorithm establishes two databases, including feasible and non-feasible database, and the repetitive solutions are replaced with the special solutions to acquire the Pareto-optimal solutions. It is demonstrated the new methodology has a good behavior in computing several simple mathematical function problems, and also can figure out truss structure multiple-objective optimization problem in the discrete system.(4).Considering transmission tower structural particularity and characteristic, and satisfying the structural optimization method standardization requirements, the transmission tower structural discrete variable optimization design method base ACO is proposed, and clearly illustrates the physical implication and optimization criteria of the different optimization component. Base on analyzing and designing a practical transmission tower structural local and whole optimization example in different levels, these instances proved that this method is not only an effective method, but also a simple and practical structural optimization design method.(5).For the transmission tower structural full-scale test is ruinously expensive, time-consuming and inconvenient, with the development of the finite element method, the transmission tower-line system progressive collapse simulation method is used to check the safety and reliability of optimization design results in this study. And the checking calculation method is applied by birth-to-death element technique in ABAQUS/Explicit to simulate transmission tower-line system progressive collapse processes. In addition, the different transmission tower structural weakness, collapse mechanism and resistant capacity is also analyzed and discussed in this paper. |
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