Core Evaluation in Performance Analysis

[rcp52]

First of all, happy new year friends.... for an existing building, 3 samples were taken from 5 floors, a total of 15 samples were taken. When entering the ide street concrete quality, if the average of these 15 cores does not exist, it is necessary to enter the revised characteristic concrete strength using the ts13791 formulas fck,is = fm(n), is - 1.48 * s fck,is = fis,lowest + 4