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Recently I designed a G+4 Building in Etabs, After Designing and getting all the results cross checked I had detailed the drawings accordingly.I had a 9"X12" columns at the upper floors i.e. From first to Roof floor. However as per my load coalculations, analysis and Design results I needed 697 Sqmm Steel area, I provided 4 dia 16 mm rebar i.e. 800 Sqmm Steel Area and released the drawings.Now another Engineer at site is in a technical Argument with me that, we cant provide 4 dia 16 bar in those columns and we need to Provide 2-12 dia Extra Rebars in them i.e 4-16+2-12.He is giving the IS456 code Ref. Clause# 26.5.3.1, point # g) "Spacing of longitudinal bars measured along periphery of the column shall not exceed 300 mm".However in my case it is not exceeding but he is telling since its at the boundary we shall opt for 2 dia 12 extra bar as "Code" Doesnt allow.My Question is, Why shall add Extra bars as my design and loads are cent percent correct and I met the minimum Reinforcement criteria.Coould someone help me in this regard. I know this topic is as per Indian Code but, it can be discussed in general.

in the image attached below, i am confused about the reinforcement of column "3E". As you can see the reinforcement in 2nd and third storey is 2.250 where as in 1st storey it jumped to 6.414. loading and panels on all stories are same. so what might be the reason for this change? is there any mistake or its normal behavior. if its normal, then what are the possible reasons for this. Moreover it is pertinent to mention that is the heaviest column in whole structure. its a three storey commercial building 45 x 48 sq feet. Looking forward to your valuable guidance.

Hello All, I usually model base of structure 1.5 meter below ground floor. Now after analysis and design. The area of steel I am getting for that 1.5 meter height is approximately 1000 Sqmm more than that of what I am getting in top floor ( Please refer to Attached pics) . My question is, in such case how to finalize the steel in the columns. Please guide me in this regard. Your kind help in this regard is required.

AOA. i am designing a 7 storey hospital building but after running design in etabs v16, some of the column on ground floor or first shows very high reinforcement as compared to upper or lower stories columns. the grid size and loading is same for all stories. can some on kindly point out what could the reason? Thanks