Table 7.4. Errors in crack width prediction

Table 7.4. Errors in crack width prediction

The above table shows the mean value of the error, its standard deviation and the 95% confidence intervals (assuming a normal distribution for the error) For example the mean error according to EC2 is werror = 0.005 mm (overestimation). With a 95% probability the underestimation will be less than -0.12 mm and the overestimation less than of 0.13 mm.

A normal distribution was assumed based on the following figure which shows the experimental error compared to normal distribution having approximately the same mean value and standard deviation (the theoretical value of the curve corresponds to EC2, but the values of the 3 models are fairly close). It can be seen that good agreement is found and that the error can effectively be assumed have a normal distribution.

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