摘要
特高压输电铁塔具有高度高、体系柔、对水平风荷载敏感的特点。以1000 kV特高压工程实例为研究对象,对输电铁塔进行了自振特性分析,验证了结构布置的合理性,利用随机振动线性滤波器理论模拟生成脉动风荷载,以求出风振系数,并将求出的结果与当前规范计算值进行对比。通过对比可知当前规范计算值无法准确反映输电铁塔的结构特点。将按照不同方法求得的风振系数代入有限元模型进行静力求解,并将得出的主材内力进行对比分析后,提出利用GB5 009—2012《建筑结构荷载规范》求得的风振系数对特高压输电铁塔进行设计计算较为合理、安全。
UHV power transmission towers are featured by high height, soft structures and being sensitive to horizontal wind loads. Taking 1 000 kV UHV transmission tower project as a research object, the self vibration characteristics of transmission towers was analyzed, and the rationality of the structural arrangement was verified. Then, the fluctuating wind load was simulated based on the random vibration theory of linear filter to obtain wind vibration coefficient, whose results were compared with the calculated values in current standards. Based on the comparative analysis results, it was found that the calculated values in current standards could not accurately describe the structural characteristics of transmission towers. Finally, the wind vibration coefficients that calculated by different methods were used in finite element models for static solution, as well as the comparative analysis was carried out on the obtained internal forces of main member, which showed that the wind vibration coefficient calculated by 2012 Architectural Structure Load Standard was more reasonable for the design of UHV transmission tower, and the design calculation result was more safe.
出处
《电力建设》
2013年第6期50-55,共6页
Electric Power Construction
关键词
特高压
输电塔
动力特性
风振系数
风振响应
UHV
power transmission tower
dynamic characteristics
wind vibration coefficient
wind-induced response
