已知强度和载荷变差系数的结构可靠性分析

THE STRUCTURAL RELIABILITY ANALYSIS FOR KNOWN VARIATION COEFFICIENTS OF STRENGTH AND LOAD

阐述了强度变差系数和载荷变差系数已知的工程背景，推导了正态分布之商的概率分布，改进了这方面的研究结果，给出了结构可靠性置信下限的分析方法，讨论了商分布的等概率曲线。通过比较各种可靠性评估方法，用算例体现了本文所提方法的优越性和实用性，说明了变差系数数据对结构可靠性分析的重要性。

Some problems about to known variation coefficients of strength and load were presented in this pa-per,those are:(1)the engineering background.(2)the deriving probability distribution of quotient of normal dis-tribution.(3)the improving research results.41 the analysis method for confidence inferior limit of structural re-liability,and equal probability curve of quotient distribution,Comparing of various reliability evaluation methodsby example,it may be seen that the method presented in the paper has been of superiority and practicality,and thedata of variation coefficient have been of importance to structural reliability analysis.