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Abstract
Application of weathering and cold-formed steel in transmission lines can reduce steel consumption and environmental pollution. Some advances in the studies on the weathering and cold-formed steel in transmission tower are introduced. Firstly, corrosion-resistant tests of weathering steel samples under different simulating technical atmospheres were carried out separately for 240 hours. It shows that the corrosion degree of joint samples is higher than that of single chip samples, and the corrosion-resistant performance of weathering steel is superior to common carbon steel. The corrosion-resistance of weathering steel meets with the requirement of transmission tower. Secondly, experiments and finite element analysis for cold-formed angles and a 220kV prototype tower were completed, and the stability coeffi-cient fitting curves as well as the modification formulas of slenderness ratio for cold-formed members were determined. According to the structural characteristics of transmission towers, four sections of cold-formed angles with different sections and slenderness ratios were selected in this study. The finite element model well predicted the buckling behav-iour of the cold-formed members. Ultimate loads calculating by the fitting curve were well agreed to the experimental values, especially for the members with small slenderness ratios. Weight of the cold-formed steel tower can be reduced by more than 5 percent after considering the strength enhancement. Cost of the weathering and cold-formed steel transmission tower is nearly equivalent to that of hot-rolled steel tower with hot galvanizing.
Highlights
With the increasing demand of electric power and the construction of resource-saving and environment-friendly society, higher requirements for the power grid have been proposed
According to the analysis of the test results, the corrosion-resistant performances of the bolted joints of weathering steel and common carbon steel were compared. It shows that the corrosion degree of joint samples is higher than that of single chip samples, and the corrosion- resistant performance of JT weathering steel is superior to common carbon steel
Some advances in the studies on the weathering and cold-formed steel in transmission towers are introduced
Summary
With the increasing demand of electric power and the construction of resource-saving and environment-friendly society, higher requirements for the power grid have been proposed. Anticorrosion by hot galvanizing can cause environmental pollution and endanger human health. Hot rolled angles have been mainly used for transmission lines in China, and hot galvanizing is the unique anticorrosion technology for transmission tower. As for a rather small number of the sizes of hot rolled angles, steel waste has been widely existed in the design and product process of transmission tower by replacing small sizes with large sizes [1]. With the developing of electric power industry and steel industry as well as the strengthening of human awareness of environmental conservation, new types of steel should be used in transmission tower structures. As the first country of developing and using weathering steel, weathering steel was applied in transmission towers early in American. Weathering steel was applied in a 350 miles transmission line of Pennsylvania [2].
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