基于连续型风速风向联合概率分布的风致结构疲劳分析方法研究

Analysis method for wind-induced structural fatigue based on continuous JPDF

结合连续型风速风向联合概率密度函数和等效窄带法,推导了连续积分形式的风致结构疲劳寿命估算公式,并将其与区格离散形式的疲劳寿命估算公式做了比较。详细介绍了风速风向联合概率密度函数、风速边缘分布函数和风向边缘分布函数模型,以及模型参数的计算方法。最后选取钢天线实例工程模型,通过拟合实测风速资料,获得风速风向联合概率密度函数。再选择不同截面处关键点位置,估算出对应关键点疲劳寿命,取最小值为结构的风致疲劳寿命。结果验证了连续积分形式的疲劳寿命估算公式的合理性。

Based on the joint probability density function of wind speed and wind direction （JPDF） and the equivalent narrow-band analysis method,a new formula in a continuous integration form for evaluating wind-induced structural fatigue life was derived here.The formula was proved to be consistent with the traditional one expressed in a discretized form.The calculation procedures for marginal distribution functions of wind speed and wind direction,and the JPDF model were explained.The applicability of the proposed method was validated by estimating the fatigue life of a steel antenna.The JPDF was firstly determined using the field measured wind data,the fatigue lives at some key points were then computed.The results demonstrated the applicability of the new formula.