温度作用设计中气象参数代表值的确定

Study on Representative Values of Meteorological Parameters for Temperature Action Design

在结构温度作用计算中需气象参数作为其边界条件,主要有日照辐射、气温日较差、风速这三个参数。根据上述环境气象参数的变化规律,在对上海地区最近30年的气象资料分析的基础上,确定了太阳辐射日最大值、夏季最大气温日较差、年最大气温日较差的概率分布接近极值I型分布,日平均风速最小值的概率分布接近正态分布。根据概率分布模型,可得到对应于不同重现期的气象参数代表值。本文所提出的方法使得结构温度作用计算中边界条件的确定建立在概率统计分析的基础上,从而使结构温度作用的计算与工程结构可靠度设计方法相协调。

The meteorological parameters, such as solar radiation, temperature difference and wind velocity are boundary conditions in temperature effect analysis of structures. Based on the analysis of the climate data in recent 30 years in Shanghai, it is estimated that the maximum daily solar radiation, the maximum daily temperature difference in summer and the maximum daily temperature difference accord with the Gumbel Ⅰ distribution, the minimum daily mean wind speed accords with the Normal distribution. The representative values of meteorological parameters are determined by the probability distribution model of each factor. The presented method suggests the representative metrological values be established on the basis of probability statistic analysis, and makes the thermal effect analysis coincide with the reliability design method of engineering structures.