I wanted to know if you can change the value of the coefficient of homogeneity n (or m), for the calculation of concrete structures.
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Which code and which point of the code do you mean please?
Italian Code NTC 2008 par. C18.104.22.168.5 " Nei casi in cui si ritenga possibile effettuare un'unica verifica indipendente dal tempo, si può assumere un coefficiente di omogeneizzazione n fra i moduli di elsticità di acciaio e calcestruzzo pari a 15."
Assuming that you want to introduce this change to EC2 design that of RC elements available in Robot then this is not possible. The ratio is calculated based on properties of selected concrete grade and steel.
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