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Two internal forces commands in concrete menu: what is the difference?

Indeed, there are two commands for the internal forces inside the concrete menu. The main difference is the amount of reinforcement for the calculation of the second moment of the area of reinforcement in the column.

So, if you calculate the internal forces via the command of the design, SCIA Engineer will assume a basic amount of reinforcement (2% *Ac). This factor can be modified by the user, while if you call the internal forces via the commands in the checks, then SCIA will use the actual amount of reinforcement.

Internal forces based on actual reinforcement in the member   

Internal forces based on reinforcement factor.