Fuzzy method of nondestructive evaluation structure strength

It is urgent to raise the reliability. of non-destructive result in building structure test, and to seek a method that can get quantitative and high confidence degree evaluation result by only using non-destructive test. A ultrasonic-rebound curve of fusion method is presented with the regression theory and data fusion method in this paper. The ultrasonic-rebound curve compared with the traditional combined method of ultrasonic-rebound curve can reduce the accidental error, and thus increase the precision of measurements. Meanwhile, the modified confidence interval, the lower and upper confidence limits of structure strength under the given confidence level is obtained by using the confidence test theory, and three evaluation standards of structure strength are given. Through practical examples, this method is roughly consistent with that of actual,engineering, and it makes quantitative judgment of structure strength in high confidence level.