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Assalam-o-alaikum! You may need to go through following steps, to reach the conclusion in this regard: 1. Calculate standard deviation of concrete strength data, as per ACI 214.4. a. If you want to learn, how the standard deviation is calculated, you may refer to the following link: https://www.easycalculation.com/statistics/learn-standard-deviation.php b. You may also use 'standard deviation calculator' available at following link, to calculate standard deviation: https://www.easycalculation.com/statistics/standard-deviation.php 2. To determine whether the lowest value is an outlier or not, calculate the the quantity, Q, given below: Q = (Average value of strength data - minimum value of strength data) / Standard deviation 3. From what I have understood from the study of ACI 214.4, ASTM E 178 and other sources I came across in this connection, you have to compare the value of Q calculated above, with the value given in Table 1 of ASTM E 178 at the 1.0% significance level for a set of six observations (since you have 6 strength test values). IMO if your calculated Q value is more than than the relevant value given in Table 1 of ASTM E178, your lowest value would be outlier. (I might be missing something here, as I have not dealt with this subject earlier. And, therefore would request others to correct me, in case I have faltered somewhere). 4. ASTM E 178 may be downloaded from the following link: http://library.sut.ac.th:8080/astm/cd14022005/PDF/E178.pdf HTH Regards.

Assalam-o-alaikum! Here are my 2 cents: If you have rectangular panels, having supports (walls, beams, columns) along the edges, the best and recommended way is to provide reinforcement in standard design strips - Column strips 7 Middle Strips (defined in ACI 318-05 Section 13.2). In SAFE software, slab reinforcement is also distributed in the form of Design Strips, subdivided into Column Strips and Middle Strips. Column strips are detailed for the required negative reinforcement, and the middle strips, for the required positive reinforcement. For rectangular slab panels, width of column strips is taken as 'span/4' of the two slab spans on either side of support (beam etc) for interior slabs, and 'sum of span/4 for exterior slab span, & the width of shade or cantilever portion' for exterior spans. In SAFE, each slab panel is subdivided into column and middle strips along both horizontal slab axes (namely, X and Y directions). Widths of various column and middle strips may be checked (and modified, if needed), using specific menu commands. For example, in order to check/modify X-direction design strips, following steps may be used (for SAFE version 8): 1. Go to 'View' -> 'Set X-strip layer' 2. Right-click on the strip to be checked/modified. 'X Design strip' options window will appear. 3. Modify the strip dimensions, if needed. 4. Press OK to make the changes effective. Process for the Y-strip layer is similar, except that 'Set Y-strip layer' option is to be selected in step-1. In case the supports are irregularly located, it is still possible to define design strips. For this purpose reference may be made to the following thread: http://www.sepakistan.com/topic/1635-design-strips-in-safe/ Regards.

W/Assalam! Please refer to following thread for necessary advice on your query: http://www.sepakistan.com/topic/1625-shear-wall-beam-overstressed-in-shear/ Regards.