桅杆结构随机风振疲劳研究

STUDY ON STOCHASTIC FATIGUE OF GUYED MASTS UNDER WIND LOAD

桅杆结构随机风振疲劳是宽带随机疲劳过程。本文基于结构宽带随机疲劳理论 ,给出桅杆结构随机风振疲劳分析方法。结合桅杆模型风洞试验结果 ,得出桅杆结构宽带随机疲劳分析的谱宽参数ε和修正系数λ。最后 ,通过一个工程算例 ,进一步给出用等效应力法、等效窄带法及雨流法计算桅杆结构风振疲劳分析过程 。

A stochastic fatigue of guyed masts under wind load is studied in the paper. The wind-induced fatigue of guyed masts is a process of the wide-band stochastic fatigue. A theoretical method for the masts is proposed; it is based on a wide-band stochastic fatigue theory. The wide-band parameter and the modified coefficient are also obtained with the results of the wind tunnel test. The equivalent stress, the equivalent narrow-band, and the rain-flow cycle counting are used in whole process. At last, an engineering example is given to illustrate the method. A comparison between the results of the method and other data is carried out; it is obtained some useful conclusions.