结构可靠度计算中的敏感性因素分析

为确定可靠性分析计算中的敏感性因素 ,提高分析结果的准确性 ,从概率分析的角度出发 ,研究了确定敏感性因素的分析方法 ,用该方法分析了结构静强度可靠度计算中的敏感性因素。在分析过程中 ,用随机变量来描述分析过程中的各种不确定性因素。每个随机变量用各自的概率分布形式和相应的分布参数描述。研究结果表明 :结构的静强度可靠度指标对外荷载比对抗力的取值更为敏感 ,特别是当荷载的变异系数较大时尤为如此

Sensitive factor analysis for structural reliability calculations

The value of sensitive factors in structural system reliability analysis greatly affects reliability calculation results. These factors must be accurately determined and studied to improve the accuracy of calculated results. A sensitive factor analysis method based on probability was developed to analyze sensitive factors in structural strength reliability calculations. Random variables, defined by their probability distribution and corresponding distribution parameters, were used to describe uncertainties in the reliability calculation. The results show that this analytical method is effective and the strength reliability index is more sensitive to uncertainties of load than other factors, especially when the coefficient of variance is large.