在此基础上采用随机振动的离散分析理论，推导出结构响应均值和方差的递推式。
Based on discrete random vibration theory, recursive square equations to calculate the mean and standard deviation of response are developed.
从结构振动的瑞利商表达式出发，利用区间运算推导出结构特征值模糊变量的计算表达式。
From the Rayleigh quotient of structural vibration, the computation expression of fuzzy variable of structural characteristic is obtained on the basis of the principles of interval arithmetic.
运用区间估计方法代替传统的点估计方法，导出结构混凝土强度的置信上限、下限和置信区间。
Meanwhile, by using interval estimation instead of the conventional point estimation, the lower and upper confidence limits, the confidence intervals of structure concrete strength are derived.
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