Hello. I have many question marks in my head for my graduation project. First of all, is there a mistake in my design for the construction, when I choose the coefficient of behavior of the building R=4, I get an error in the error report, why should I determine the rigid diaphragm, what is the factor in this, after making the staircase analysis, when looking at the stair reinforcements, it shows the stair reinforcements as if they are not stuck in the landing at the floor level as if the staircase is independent of the construction Thanks in advance for your help, good work
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