大跨越输电塔线体系随机脉动风场模拟研究  

SIMULATION STUDY OF STOCHASTIC FLUCTUATING WIND FIELD ON LARGE SPAN ELATRICITY TRANSMISSION TOWER-LINE SYSTEM

作　　者：白海峰[1,2] 李宏男[1] 

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室 [2]中铁九局集团有限公司技术中心,辽宁沈阳110013

出　　处：《工程力学》2007年第7期146-151,共6页Engineering Mechanics

摘　　要：为在时域内分析大跨越输电塔-线体系风振响应,根据结构体型特征和脉动风场的功率谱特性,考虑输电塔-线分布、平均风剖面变化、功率谱能量与相干性等影响因素,提出了简化作用于输电塔线体系的多变量三维脉动风场(n-V-3D)为多变量一维脉动风场(n-V-1D)分析方法。结合输电塔线体系有限元法风振响应分析的特点,应用谐波叠加法和谱分解的适当修正,建立了脉动风速时程数值模拟方法。实例模拟表明,数据符合统计检验,模拟功率谱与目标谱吻合,从而验证了模拟方法的有效性和模拟脉动风速时程适用性。To perform a wind-induced response analysis for large span electricity transmission tower-line systems in time domain, considering various influences such as tower-line distribution, variation of mean velocity profile, power spectral energy and cross-spectral coherence in relation with structural style and power spectral characteristics of stochastic fluctuating wind field, a simplified scheme which can transform a multivariable 3D fluctuating wind field （n-V-3D ） acting on large span transmission tower-line systems into a multivariable 1D stochastic wind field （n-V-1D） has been presented. Based on harmonic wave superimposing method and appropriate modified spectral decomposition, time marching generating method of fluctuating wind has been developed, which is suitable to analyze the wind-induced response of transmission tower-line system in combination with the finite element method. Finally, taking a real case as example, the time-marching curves were simulated. The results from statistical analysis of simulated data and comparison with target spectrum demonstrated the validity of the presented method and the applicability of simulated wind time-marching for wind-induced response analysis.

关 键 词：大跨越输电塔线体系 随机风场模拟 谐波叠加法 数值模拟 算例分析 

分 类 号：O32[理学—一般力学与力学基础] O354[理学—力学]