输电塔组合角钢构件稳定性分析  

STABILITY ANALYSIS ON THE MULTIPLE ANGLE MEMBERS OF TRANSMISSION TOWERS

作　　者：郭勇[1] 沈建国[1] 应建国[1] 

机构地区：[1]浙江省电力设计院,杭州310012

出　　处：《钢结构》2012年第1期11-16,共6页Steel Construction

摘　　要：输电塔的主材通常采用单角钢、双肢和四肢组合角钢构件。通过对GB 50017-2003《钢结构设计规范》和DL/T 5154-2002《架空送电线路杆塔结构设计技术规定》的比较,指出当采用局部稳定强度折减系数mN后,即可不必考虑扭转屈曲对组合角钢构件稳定性的影响。真型塔试验结果表明,通过普通螺栓连接的组合角钢分肢存在受力的不均性,并将产生较大的截面偏心弯矩,从而导致构件提前弯曲失稳破坏。建议采用组合长细比来反映分肢受力不均的影响,并给出换算长细比的计算公式。The chord of transmission towers are generally single angle or multiple angle.The effect of the torsion buckling to the stability of multiple angle members can be ignored when the strength reduction factor mN is adopted through the comparison between the Code Design of Steel Structures（GB 50017-2003） and Technical Regulation of Design for Tower（DL/T 5154-2002）.Based on the results of prototype tower test,the bearing inequality of the limbs in the multiple angle combined with common bolts will generate larger eccentric bending moment and induce the buckling damage ahead of time.The equivalent slenderness ratio is proposed to reflect the effect and the computational formula is suggested.

关 键 词：输电塔 组合角钢 整体稳定 扭转屈曲 换算长细比 

分 类 号：TU391[建筑科学—结构工程]