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强度特征值是木质材料的重要力学性能指标之一,是其在建筑结构中安全设计和合理应用的依据,根据设定的置信度水平确定。通过以正态分布生成的随机样本作为算例,采用非参数法,研究置信度水平与样本的强度变异系数、试样个数、特征值取样顺序数的相互关系,确定不同置信度水平、取样顺序数下要求的最小试样数,并提出特征值取样顺序数计算公式。
Strength characteristic value is one of the important mechanical properties of wood materials, which is the basis for its safe design and rational application in building structure, which is determined according to the set confidence level. By using random samples generated by normal distribution as an example, the relationship between the confidence level and the sample’s strength variation coefficient, the number of samples and the sampling sequence number of eigenvalue are studied by non-parametric method to determine the different confidence levels, The number of samples required under the order number, and the formula for calculating the order of eigenvalue sampling is proposed.