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 towe...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.展开更多
耐候钢及冷弯型钢输电铁塔的显著特点是可避免传统输电铁塔的热镀锌防腐,大幅度减少环境污染。以梧侣—内官220 k V输电线路工程为依托,设计出1基耐候钢及冷弯角钢直线塔SZ621N。为了保证工程的安全可靠运行,耐候钢及冷弯型输电铁塔顺...耐候钢及冷弯型钢输电铁塔的显著特点是可避免传统输电铁塔的热镀锌防腐,大幅度减少环境污染。以梧侣—内官220 k V输电线路工程为依托,设计出1基耐候钢及冷弯角钢直线塔SZ621N。为了保证工程的安全可靠运行,耐候钢及冷弯型输电铁塔顺利通过了9个工况的100%设计荷载测试,其中超载工况下,当荷载达到118%时,铁塔发生失稳破坏。各工况试验实测位移与理论计算位移相吻合。根据试验结果,提出了耐候钢及冷弯型钢输电铁塔设计中应该注意的问题。展开更多
文摘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.
文摘耐候钢及冷弯型钢输电铁塔的显著特点是可避免传统输电铁塔的热镀锌防腐,大幅度减少环境污染。以梧侣—内官220 k V输电线路工程为依托,设计出1基耐候钢及冷弯角钢直线塔SZ621N。为了保证工程的安全可靠运行,耐候钢及冷弯型输电铁塔顺利通过了9个工况的100%设计荷载测试,其中超载工况下,当荷载达到118%时,铁塔发生失稳破坏。各工况试验实测位移与理论计算位移相吻合。根据试验结果,提出了耐候钢及冷弯型钢输电铁塔设计中应该注意的问题。