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this book also useful NED research paper https://www.academia.edu/8983144/A_Practical_Guide_to_Nonlinear_Static_Analysis_of_Reinforced_Concrete_Buildings_with_Masonry_Infill_Walls

Assalam-o-alaikum! 1. You may refer to the following thread for some good books related to the design of load bearing structures: http://www.sepakistan.com/topic/1652-load-bearing-structure-design/#entry4141 2. There are several masonry design programs, available on the internet. A few of them, based on US codes, are as under: a. NCMA design software (http://ncma-br.org/sw.asp), b. CMD12 (http://www.cmacn.org/bookstore-computer.htm#CP001), c. IES QuickMasonry (http://www.iesweb.com/products/quickmasonry/index.htm), etc., etc. However, whether these are suitable for your requirements or not, may not be easy. You may download their demos or trial versions to check what they can do, and to what extent. (I myself have neither needed them, nor have used any of them so far.). IMO, It would however be better if you could develop your own spreadsheets for the design of different masonry elements, AFTER learning the design methodology, using the relevant codes & books (referred above, and elsewhere.) If you could provide some details about the load bearing structure you want to design, you might get a better and more specific advice here. Regards.

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.