upper floor column reinforcement increase

gunner

New Member
Hello. A workplace with 2 basements, a ground floor and a mezzanine will be built. The reinforcement of the columns on the mezzanine floor, which is the last floor in my project, is 2 times more compared to the other floors. Normally, in such cases, I would take the columns with more reinforcement as a basis and arrange the column reinforcements on the other lower floor accordingly. but this method will not be very economical because the difference is too much. Is it something that I have neglected? I would be glad if you help.
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In such systems, the normal force decreases in the columns of the top floor, while the shared moment increases due to the fact that the column does not continue at the top. As a result, the need for reinforcement in the upper floors of the columns may be higher than in the lower floors. In your project, for example, when we look at the B axis S3 column, you can observe that the reinforcement combination of 1.4G+1.6Q becomes active in the mezzanine in the column, the normal force decreases at the top floor, and the moment increases in the major direction, especially at the upper joint. Good work
 
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