长横担输电塔风致薄弱部位及加强措施  

Wind-induced weak parts and reinforcement methods of long cross-armed transmission tower

作　　者：楼文娟[1] 姜雄[1] 夏亮[1] 金晓华[2] 王振华[2] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310058 [2]广东省电力设计研究院,广东广州510663

出　　处：《浙江大学学报（工学版）》2013年第10期1798-1804,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51178424)

摘　　要：以沿海地区某220kV长横担角钢输电塔为原型,通过气弹模型风洞试验考察结构的气动失稳趋势及薄弱部位,结合数值分析研究抗风加强措施.塔头部位由于不利的气固耦合效应,在高风速下出现了较明显的弯扭耦合振动现象;塔身下部长斜材在风振激励下,产生局部振动,面外位移增大,易引发构件的压弯破坏.分别采取增强塔头斜材和增设横隔面等措施对原结构进行抗风加强设计.后续试验结果和理论计算均表明:加强横担之间的斜材对减小塔头扭转振动的效果明显;在长斜材节段处增设横隔面可以抑制局部振型的提前出现,有效地降低斜材的压弯应力,从而提高整塔的极限承载能力.A fine aero-elastic model of 220kV long cross-armed angle steel transmission tower was designed and produced to investigate wind-induced response under terrain B wind field. Structural optimization for wind resistant design of the tower was conducted by means of the numerical analysis and the phenomena of the wind tunnel test. Essential conclusions are as follows： due to the gas-solid coupled effect, strong flexure-torsion vibration was observed during the wind tunnel test, which would lead to the premature instability of angle steel members. Several local vibrations appeared in the very first several modes subjected to the fluctuating wind excitation; which resulted in the large out-of-plane deformation and eventually the reduction of the ultimate hearing capacity. Further research shows that the torsional vibration can be apparently reduced by increasing the rigidity of diagonal bracings between the arms of the tower. Adding diaphragms with appropriate arrangements can remarkably optimize the dynamic characteristics, suppress the local vibrations, and ensure the global stability of the tower.

关 键 词：长横担角钢输电塔 加强措施 动力特性 横隔面 交叉斜材 

分 类 号：TU973.32[建筑科学—结构工程]