even if you dont reduce stiffness it will be ok! but why we reduce stiffness is to redistribute internal forces from less stiff to more stiff areas like from beams (35%) to columns or walls (70% reduction). like we reduce beam stiffness by 35% and column by 70% (uncracked). Now how we can reduce its properties? there are many methods.like the one given in chapter 10 of the code (ACI). Now obviously when concrete cracks.we cannot analyze our section based on full inertia.so we have to reduce the stiffness, because its in reality. So once concrete starts cracking.(when concrete cannot take tension) reinfrocement starts taking the tension. before that the reinforcement is not taking action. Read chapter 10.Actually concrete cracks just after it reaches its tensile strength (about 7.5 to 10 or 12% of its compressive strength).
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