摘要
输电线路铁塔应用冷弯型钢,可以提高输电铁塔设计水平,降低钢材用量。文章结合输电铁塔的结构特点,选取不同截面、长细比的冷弯角钢构件进行轴心受压承载力试验和有限元分析,得到了输电铁塔用冷弯角钢轴心受压构件的荷载-应变发展规律和极限承载力,并与现行设计规范承载力计算值进行了对比。分析结果表明,现行规范体系不适合我国输电铁塔冷弯型钢轴心受压构件的强度设计。通过对试验和理论分析结果进行拟合,确定了输电铁塔冷弯型钢轴心受压构件稳定系数曲线,提出了输电铁塔冷弯型钢构件承载力计算的修正意见。
The design level of transmission towers in China can be improved and steel product consumption for it can be reduced by adopting cold-bending profile steel to transmission tower. Based on the structural features of transmission tower, the cold-bending angle steel members with different cross-sections and slenderness ratios are chosen for bearing strength test under axial compression and finite element analysis, thus the load-strain law and ultimate bearing capacities of cold-bending angle steel members of transmission towers under axial compression are obtained, and the obtained ultimate bearing capacities are compared with the bearing capacities calculated by active design specifications. Analysis results show that current specification system is unsuit to the strength design of axial-compressed cold-bending angle steel members for transmission towers in China. Through the fitting of test results with theoretical analysis results, the stability coefficient curve of axial-compressed cold-bending angle steel members for transmission towers is decided and some modification suggestions on bearing capacity calculation of cold-bending angle steel members for transmission towers are proposed.
出处
《电网技术》
EI
CSCD
北大核心
2010年第2期194-199,共6页
Power System Technology
基金
国家电网公司科技项目(SGKJ2007[117])
关键词
输电铁塔
冷弯角钢
构件试验
稳定系数
transmission tower
cold-bending angle steel
member test
stability coefficient
