Some Advances in the Application of Weathering and Cold-Formed Steel in Transmission Tower
- 1 China Electric Power Research Institute, Beijing, China
- 2 China Electric Power Research Institute, Beijing, China
- 3 China Electric Power Research Institute, Beijing, China
- 4 China Electric Power Research Institute, Beijing, China
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.
- C. H. He, “Feasibility discussion on application of high strength cold-formed section steel in transmission tower,” [J]. Steel Construction, 19(74), pp. 35-37, 2004.
- Beijing Electric Power Construction Research Institute of SGCC, “Study on the application on weathering steel and cold-formed steel in transmission tower [R],” Beijing, 2007.
- Ministry of Construction of People’s Republic of China, Chinese Technical code of cold-formed thin-wall steel structures: GB50018-2002 [S], Beijing, 2003.
- American Society of Civil Engineers, Design of Latticed Steel Transmission Structures: ASCE110-97 [S], USA, 1998.
- European Committee for Electrotechnical Standardization. Overhead electrical lines exceeding AC 45 kV: EN50341-1 [S], 2001.
- B. S. Gu, B. Wang, X. C. Ji, M. S. Xia, and J. H. Liu, “Study on Corrosion of JT245 Weathering Steel,” [J]. Journal of Steel and Iron Research, 17(6), pp. 55-58, 2005.
- F. L. Yang, J. K. Han, J. B. Yang, M. S. Xia, and Z. Y. Wang,“Study on corrosion-resistant performance tests of weather-proof steel node used in transmission towers,”[J]. Electric Power Construction, 29(9), pp. 23-28, 2008.
- S. J. Mohan, S. R. Shabeen, and G. M. S. Knight, “Behavior of cold formed lipped angles in transmission line towers,”[J]. Thin-Walled Structures, 44, pp. 1017- 1030, 2006.
- B. Young, “Experimental investigation of cold-formed steel lipped angle concentrically loaded compression members,” [J]. Journal of Structural Engineering, 131(9), pp. 1390-1396, 2005.
- National Economy and Trade Commission of PRC. Technical Regulation of design for tower and pole structures of overhead transmission line [S]. DL/T5154- 2002, China Electric Press, 2002.