摘要
输电塔钢管杆件易发生微风振动,起振风速与杆件自振频率有关。为了获得钢管杆件的自振频率规律,分别通过动力特性试验和ANSYS有限元模拟进行了研究,得到了常用长细比典型节点钢管杆件的1阶自振频率。结果表明单插板连接和U插板连接杆件弱轴1阶自振频率接近于两端铰接结果、强轴1阶自振频率接近于两端固接结果,十字插板连接和法兰连接杆件1阶自振频率接近于两端固接结果,螺栓数对钢管杆件1阶自振频率影响不大。最后总结出了方便工程应用的1阶自振频率简化计算方法。
Breeze vibration often occurs in steel tubular members of a transmission tower.Critical wind speed for vibration starting is related to natural frequencies of steel tubular members.To analyze the law of their natural frequencies,the 1st natural frequencies of steel tubular members were obtained connected with typical joints in different slenderness ratios through dynamic characteristic tests and ANSYS simulations.The results showed that the 1st natural frequencies in weak axis with I-inserting-plate joint and U-inserting-plate joint were close to those with hinge joints at both ends and their 1st natural frequencies in strong axis were close to those with fixed joints at both ends;the 1st natural frequencies of steel tubular members connected with cross-gusset joints and flange joints were close to those connected with hinge joints at both ends and bolt number had little effect.Finally,a simplified calculation method of the 1st natural frequencies was deduced for designing conveniently.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第10期60-63,125,共5页
Journal of Vibration and Shock
基金
福建省电力公司科研项目(科2007-45)
关键词
动力特性试验
钢管杆件
插板连接
法兰连接
dynamic characteristic test
steel tubular members
inserted plate joint
flange joint
