08-06-2010, 11:54 PM
Dear Imran:
Apart from the comments made by robert, I see your images that you are using envelopes (?) The envelopes are useful to give you an idea how to find the solicitation more critical in a design manual. But if you do a design based on design codes included in ETABS or other software, it is not necessary, even more, and is beyond logic, for the same program evaluates all combinations and look at each element combination is the most critical and need not be the same throughout the structure.
Instead of using combinaciontes type "ENVE", use the type "ADD" to consider different load factors according to the rules in use
Apart from the comments made by robert, I see your images that you are using envelopes (?) The envelopes are useful to give you an idea how to find the solicitation more critical in a design manual. But if you do a design based on design codes included in ETABS or other software, it is not necessary, even more, and is beyond logic, for the same program evaluates all combinations and look at each element combination is the most critical and need not be the same throughout the structure.
Instead of using combinaciontes type "ENVE", use the type "ADD" to consider different load factors according to the rules in use