【摘要】 考虑输电塔结构体型特征、平均风剖面变化、功率谱能量特性与相干性等影响因素,通过谐波叠加法,对输电塔结构进行了脉动风速模拟,并以Kaimal谱为谱模型生成脉动风,通过数值计算验证了脉动风模拟方法的有效性。结合脉动风速模拟提出一种雨激励的模拟方法,计算出在一定风速情况下雨的冲击力。建立了输电塔的精细化有限元分析模型,研究了在风单独作用与风雨共同作用下的输电塔体系的动力响应,探讨了雨荷载对输电塔体系动力响应的影响。研究结果表明,雨荷载激励对输电塔的影响不能忽略。更多还原

【Abstract】 Considering various influences such as structural style,variation of mean velocity profile,characteristics of power spectral energy and cross-spectral coherence i.e.,based on the harmonic wave superimposing method,the time marching generating method of fluctuating wind has been developed. Based on Kaimal spectra,the time march of fluctuating wind is simulated. The validity of the method is demonstrated. Combined with the simulation of wind field,a simulating method of rain loading is presented. A rain-wind-induced dynamic model for transmission tower system is established. A precise finite element model of transmission tower is established. The results of rain-wind-induced dynamic response of transmission tower are compared with results of wind-induced response. It is shown that the effect of rain on the transmission towers may not be neglected.更多还原